Merge tag 'bitmap-for-6.7' of https://github.com/norov/linux

Pull bitmap updates from Yury Norov:
 "This includes the 'bitmap: cleanup bitmap_*_region() implementation'
  series, and scattered cleanup patches"

* tag 'bitmap-for-6.7' of https://github.com/norov/linux:
  buildid: reduce header file dependencies for module
  bitmap: move bitmap_*_region() functions to bitmap.h
  bitmap: drop _reg_op() function
  bitmap: replace _reg_op(REG_OP_ISFREE) with find_next_bit()
  bitmap: replace _reg_op(REG_OP_RELEASE) with bitmap_clear()
  bitmap: replace _reg_op(REG_OP_ALLOC) with bitmap_set()
  bitmap: fix opencoded bitmap_allocate_region()
  bitmap: add test for bitmap_*_region() functions
  bitmap: align __reg_op() wrappers with modern coding style
  lib/bitmap: split-out string-related operations to a separate files
  bitmap: Remove dead code, i.e. bitmap_copy_le()
  bitmap: Fix a typo ("identify map")
  cpumask: kernel-doc cleanups and additions

5 files changed, 549 insertions, 684 deletions

diff --git a/lib/Makefile b/lib/Makefile
index 9e0972f7b7643..13455f47f9df6 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -48,7 +48,7 @@ obj-y += bcd.o sort.o parser.o debug_locks.o random32.o \
 	 bsearch.o find_bit.o llist.o lwq.o memweight.o kfifo.o \
 	 percpu-refcount.o rhashtable.o base64.o \
 	 once.o refcount.o rcuref.o usercopy.o errseq.o bucket_locks.o \
-	 generic-radix-tree.o
+	 generic-radix-tree.o bitmap-str.o
 obj-$(CONFIG_STRING_SELFTEST) += test_string.o
 obj-y += string_helpers.o
 obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o
diff --git a/lib/bitmap-str.c b/lib/bitmap-str.c
new file mode 100644
index 0000000000000..be745209507a4
--- /dev/null
+++ b/lib/bitmap-str.c
@@ -0,0 +1,510 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/bitmap.h>
+#include <linux/ctype.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/hex.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+
+#include "kstrtox.h"
+
+/**
+ * bitmap_parse_user - convert an ASCII hex string in a user buffer into a bitmap
+ *
+ * @ubuf: pointer to user buffer containing string.
+ * @ulen: buffer size in bytes.  If string is smaller than this
+ *    then it must be terminated with a \0.
+ * @maskp: pointer to bitmap array that will contain result.
+ * @nmaskbits: size of bitmap, in bits.
+ */
+int bitmap_parse_user(const char __user *ubuf,
+			unsigned int ulen, unsigned long *maskp,
+			int nmaskbits)
+{
+	char *buf;
+	int ret;
+
+	buf = memdup_user_nul(ubuf, ulen);
+	if (IS_ERR(buf))
+		return PTR_ERR(buf);
+
+	ret = bitmap_parse(buf, UINT_MAX, maskp, nmaskbits);
+
+	kfree(buf);
+	return ret;
+}
+EXPORT_SYMBOL(bitmap_parse_user);
+
+/**
+ * bitmap_print_to_pagebuf - convert bitmap to list or hex format ASCII string
+ * @list: indicates whether the bitmap must be list
+ * @buf: page aligned buffer into which string is placed
+ * @maskp: pointer to bitmap to convert
+ * @nmaskbits: size of bitmap, in bits
+ *
+ * Output format is a comma-separated list of decimal numbers and
+ * ranges if list is specified or hex digits grouped into comma-separated
+ * sets of 8 digits/set. Returns the number of characters written to buf.
+ *
+ * It is assumed that @buf is a pointer into a PAGE_SIZE, page-aligned
+ * area and that sufficient storage remains at @buf to accommodate the
+ * bitmap_print_to_pagebuf() output. Returns the number of characters
+ * actually printed to @buf, excluding terminating '\0'.
+ */
+int bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp,
+			    int nmaskbits)
+{
+	ptrdiff_t len = PAGE_SIZE - offset_in_page(buf);
+
+	return list ? scnprintf(buf, len, "%*pbl\n", nmaskbits, maskp) :
+		      scnprintf(buf, len, "%*pb\n", nmaskbits, maskp);
+}
+EXPORT_SYMBOL(bitmap_print_to_pagebuf);
+
+/**
+ * bitmap_print_to_buf  - convert bitmap to list or hex format ASCII string
+ * @list: indicates whether the bitmap must be list
+ *      true:  print in decimal list format
+ *      false: print in hexadecimal bitmask format
+ * @buf: buffer into which string is placed
+ * @maskp: pointer to bitmap to convert
+ * @nmaskbits: size of bitmap, in bits
+ * @off: in the string from which we are copying, We copy to @buf
+ * @count: the maximum number of bytes to print
+ */
+static int bitmap_print_to_buf(bool list, char *buf, const unsigned long *maskp,
+		int nmaskbits, loff_t off, size_t count)
+{
+	const char *fmt = list ? "%*pbl\n" : "%*pb\n";
+	ssize_t size;
+	void *data;
+
+	data = kasprintf(GFP_KERNEL, fmt, nmaskbits, maskp);
+	if (!data)
+		return -ENOMEM;
+
+	size = memory_read_from_buffer(buf, count, &off, data, strlen(data) + 1);
+	kfree(data);
+
+	return size;
+}
+
+/**
+ * bitmap_print_bitmask_to_buf  - convert bitmap to hex bitmask format ASCII string
+ * @buf: buffer into which string is placed
+ * @maskp: pointer to bitmap to convert
+ * @nmaskbits: size of bitmap, in bits
+ * @off: in the string from which we are copying, We copy to @buf
+ * @count: the maximum number of bytes to print
+ *
+ * The bitmap_print_to_pagebuf() is used indirectly via its cpumap wrapper
+ * cpumap_print_to_pagebuf() or directly by drivers to export hexadecimal
+ * bitmask and decimal list to userspace by sysfs ABI.
+ * Drivers might be using a normal attribute for this kind of ABIs. A
+ * normal attribute typically has show entry as below::
+ *
+ *   static ssize_t example_attribute_show(struct device *dev,
+ *		struct device_attribute *attr, char *buf)
+ *   {
+ *	...
+ *	return bitmap_print_to_pagebuf(true, buf, &mask, nr_trig_max);
+ *   }
+ *
+ * show entry of attribute has no offset and count parameters and this
+ * means the file is limited to one page only.
+ * bitmap_print_to_pagebuf() API works terribly well for this kind of
+ * normal attribute with buf parameter and without offset, count::
+ *
+ *   bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp,
+ *			   int nmaskbits)
+ *   {
+ *   }
+ *
+ * The problem is once we have a large bitmap, we have a chance to get a
+ * bitmask or list more than one page. Especially for list, it could be
+ * as complex as 0,3,5,7,9,... We have no simple way to know it exact size.
+ * It turns out bin_attribute is a way to break this limit. bin_attribute
+ * has show entry as below::
+ *
+ *   static ssize_t
+ *   example_bin_attribute_show(struct file *filp, struct kobject *kobj,
+ *		struct bin_attribute *attr, char *buf,
+ *		loff_t offset, size_t count)
+ *   {
+ *	...
+ *   }
+ *
+ * With the new offset and count parameters, this makes sysfs ABI be able
+ * to support file size more than one page. For example, offset could be
+ * >= 4096.
+ * bitmap_print_bitmask_to_buf(), bitmap_print_list_to_buf() wit their
+ * cpumap wrapper cpumap_print_bitmask_to_buf(), cpumap_print_list_to_buf()
+ * make those drivers be able to support large bitmask and list after they
+ * move to use bin_attribute. In result, we have to pass the corresponding
+ * parameters such as off, count from bin_attribute show entry to this API.
+ *
+ * The role of cpumap_print_bitmask_to_buf() and cpumap_print_list_to_buf()
+ * is similar with cpumap_print_to_pagebuf(),  the difference is that
+ * bitmap_print_to_pagebuf() mainly serves sysfs attribute with the assumption
+ * the destination buffer is exactly one page and won't be more than one page.
+ * cpumap_print_bitmask_to_buf() and cpumap_print_list_to_buf(), on the other
+ * hand, mainly serves bin_attribute which doesn't work with exact one page,
+ * and it can break the size limit of converted decimal list and hexadecimal
+ * bitmask.
+ *
+ * WARNING!
+ *
+ * This function is not a replacement for sprintf() or bitmap_print_to_pagebuf().
+ * It is intended to workaround sysfs limitations discussed above and should be
+ * used carefully in general case for the following reasons:
+ *
+ *  - Time complexity is O(nbits^2/count), comparing to O(nbits) for snprintf().
+ *  - Memory complexity is O(nbits), comparing to O(1) for snprintf().
+ *  - @off and @count are NOT offset and number of bits to print.
+ *  - If printing part of bitmap as list, the resulting string is not a correct
+ *    list representation of bitmap. Particularly, some bits within or out of
+ *    related interval may be erroneously set or unset. The format of the string
+ *    may be broken, so bitmap_parselist-like parser may fail parsing it.
+ *  - If printing the whole bitmap as list by parts, user must ensure the order
+ *    of calls of the function such that the offset is incremented linearly.
+ *  - If printing the whole bitmap as list by parts, user must keep bitmap
+ *    unchanged between the very first and very last call. Otherwise concatenated
+ *    result may be incorrect, and format may be broken.
+ *
+ * Returns the number of characters actually printed to @buf
+ */
+int bitmap_print_bitmask_to_buf(char *buf, const unsigned long *maskp,
+				int nmaskbits, loff_t off, size_t count)
+{
+	return bitmap_print_to_buf(false, buf, maskp, nmaskbits, off, count);
+}
+EXPORT_SYMBOL(bitmap_print_bitmask_to_buf);
+
+/**
+ * bitmap_print_list_to_buf  - convert bitmap to decimal list format ASCII string
+ * @buf: buffer into which string is placed
+ * @maskp: pointer to bitmap to convert
+ * @nmaskbits: size of bitmap, in bits
+ * @off: in the string from which we are copying, We copy to @buf
+ * @count: the maximum number of bytes to print
+ *
+ * Everything is same with the above bitmap_print_bitmask_to_buf() except
+ * the print format.
+ */
+int bitmap_print_list_to_buf(char *buf, const unsigned long *maskp,
+			     int nmaskbits, loff_t off, size_t count)
+{
+	return bitmap_print_to_buf(true, buf, maskp, nmaskbits, off, count);
+}
+EXPORT_SYMBOL(bitmap_print_list_to_buf);
+
+/*
+ * Region 9-38:4/10 describes the following bitmap structure:
+ * 0	   9  12    18			38	     N
+ * .........****......****......****..................
+ *	    ^  ^     ^			 ^	     ^
+ *      start  off   group_len	       end	 nbits
+ */
+struct region {
+	unsigned int start;
+	unsigned int off;
+	unsigned int group_len;
+	unsigned int end;
+	unsigned int nbits;
+};
+
+static void bitmap_set_region(const struct region *r, unsigned long *bitmap)
+{
+	unsigned int start;
+
+	for (start = r->start; start <= r->end; start += r->group_len)
+		bitmap_set(bitmap, start, min(r->end - start + 1, r->off));
+}
+
+static int bitmap_check_region(const struct region *r)
+{
+	if (r->start > r->end || r->group_len == 0 || r->off > r->group_len)
+		return -EINVAL;
+
+	if (r->end >= r->nbits)
+		return -ERANGE;
+
+	return 0;
+}
+
+static const char *bitmap_getnum(const char *str, unsigned int *num,
+				 unsigned int lastbit)
+{
+	unsigned long long n;
+	unsigned int len;
+
+	if (str[0] == 'N') {
+		*num = lastbit;
+		return str + 1;
+	}
+
+	len = _parse_integer(str, 10, &n);
+	if (!len)
+		return ERR_PTR(-EINVAL);
+	if (len & KSTRTOX_OVERFLOW || n != (unsigned int)n)
+		return ERR_PTR(-EOVERFLOW);
+
+	*num = n;
+	return str + len;
+}
+
+static inline bool end_of_str(char c)
+{
+	return c == '\0' || c == '\n';
+}
+
+static inline bool __end_of_region(char c)
+{
+	return isspace(c) || c == ',';
+}
+
+static inline bool end_of_region(char c)
+{
+	return __end_of_region(c) || end_of_str(c);
+}
+
+/*
+ * The format allows commas and whitespaces at the beginning
+ * of the region.
+ */
+static const char *bitmap_find_region(const char *str)
+{
+	while (__end_of_region(*str))
+		str++;
+
+	return end_of_str(*str) ? NULL : str;
+}
+
+static const char *bitmap_find_region_reverse(const char *start, const char *end)
+{
+	while (start <= end && __end_of_region(*end))
+		end--;
+
+	return end;
+}
+
+static const char *bitmap_parse_region(const char *str, struct region *r)
+{
+	unsigned int lastbit = r->nbits - 1;
+
+	if (!strncasecmp(str, "all", 3)) {
+		r->start = 0;
+		r->end = lastbit;
+		str += 3;
+
+		goto check_pattern;
+	}
+
+	str = bitmap_getnum(str, &r->start, lastbit);
+	if (IS_ERR(str))
+		return str;
+
+	if (end_of_region(*str))
+		goto no_end;
+
+	if (*str != '-')
+		return ERR_PTR(-EINVAL);
+
+	str = bitmap_getnum(str + 1, &r->end, lastbit);
+	if (IS_ERR(str))
+		return str;
+
+check_pattern:
+	if (end_of_region(*str))
+		goto no_pattern;
+
+	if (*str != ':')
+		return ERR_PTR(-EINVAL);
+
+	str = bitmap_getnum(str + 1, &r->off, lastbit);
+	if (IS_ERR(str))
+		return str;
+
+	if (*str != '/')
+		return ERR_PTR(-EINVAL);
+
+	return bitmap_getnum(str + 1, &r->group_len, lastbit);
+
+no_end:
+	r->end = r->start;
+no_pattern:
+	r->off = r->end + 1;
+	r->group_len = r->end + 1;
+
+	return end_of_str(*str) ? NULL : str;
+}
+
+/**
+ * bitmap_parselist - convert list format ASCII string to bitmap
+ * @buf: read user string from this buffer; must be terminated
+ *    with a \0 or \n.
+ * @maskp: write resulting mask here
+ * @nmaskbits: number of bits in mask to be written
+ *
+ * Input format is a comma-separated list of decimal numbers and
+ * ranges.  Consecutively set bits are shown as two hyphen-separated
+ * decimal numbers, the smallest and largest bit numbers set in
+ * the range.
+ * Optionally each range can be postfixed to denote that only parts of it
+ * should be set. The range will divided to groups of specific size.
+ * From each group will be used only defined amount of bits.
+ * Syntax: range:used_size/group_size
+ * Example: 0-1023:2/256 ==> 0,1,256,257,512,513,768,769
+ * The value 'N' can be used as a dynamically substituted token for the
+ * maximum allowed value; i.e (nmaskbits - 1).  Keep in mind that it is
+ * dynamic, so if system changes cause the bitmap width to change, such
+ * as more cores in a CPU list, then any ranges using N will also change.
+ *
+ * Returns: 0 on success, -errno on invalid input strings. Error values:
+ *
+ *   - ``-EINVAL``: wrong region format
+ *   - ``-EINVAL``: invalid character in string
+ *   - ``-ERANGE``: bit number specified too large for mask
+ *   - ``-EOVERFLOW``: integer overflow in the input parameters
+ */
+int bitmap_parselist(const char *buf, unsigned long *maskp, int nmaskbits)
+{
+	struct region r;
+	long ret;
+
+	r.nbits = nmaskbits;
+	bitmap_zero(maskp, r.nbits);
+
+	while (buf) {
+		buf = bitmap_find_region(buf);
+		if (buf == NULL)
+			return 0;
+
+		buf = bitmap_parse_region(buf, &r);
+		if (IS_ERR(buf))
+			return PTR_ERR(buf);
+
+		ret = bitmap_check_region(&r);
+		if (ret)
+			return ret;
+
+		bitmap_set_region(&r, maskp);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(bitmap_parselist);
+
+
+/**
+ * bitmap_parselist_user() - convert user buffer's list format ASCII
+ * string to bitmap
+ *
+ * @ubuf: pointer to user buffer containing string.
+ * @ulen: buffer size in bytes.  If string is smaller than this
+ *    then it must be terminated with a \0.
+ * @maskp: pointer to bitmap array that will contain result.
+ * @nmaskbits: size of bitmap, in bits.
+ *
+ * Wrapper for bitmap_parselist(), providing it with user buffer.
+ */
+int bitmap_parselist_user(const char __user *ubuf,
+			unsigned int ulen, unsigned long *maskp,
+			int nmaskbits)
+{
+	char *buf;
+	int ret;
+
+	buf = memdup_user_nul(ubuf, ulen);
+	if (IS_ERR(buf))
+		return PTR_ERR(buf);
+
+	ret = bitmap_parselist(buf, maskp, nmaskbits);
+
+	kfree(buf);
+	return ret;
+}
+EXPORT_SYMBOL(bitmap_parselist_user);
+
+static const char *bitmap_get_x32_reverse(const char *start,
+					const char *end, u32 *num)
+{
+	u32 ret = 0;
+	int c, i;
+
+	for (i = 0; i < 32; i += 4) {
+		c = hex_to_bin(*end--);
+		if (c < 0)
+			return ERR_PTR(-EINVAL);
+
+		ret |= c << i;
+
+		if (start > end || __end_of_region(*end))
+			goto out;
+	}
+
+	if (hex_to_bin(*end--) >= 0)
+		return ERR_PTR(-EOVERFLOW);
+out:
+	*num = ret;
+	return end;
+}
+
+/**
+ * bitmap_parse - convert an ASCII hex string into a bitmap.
+ * @start: pointer to buffer containing string.
+ * @buflen: buffer size in bytes.  If string is smaller than this
+ *    then it must be terminated with a \0 or \n. In that case,
+ *    UINT_MAX may be provided instead of string length.
+ * @maskp: pointer to bitmap array that will contain result.
+ * @nmaskbits: size of bitmap, in bits.
+ *
+ * Commas group hex digits into chunks.  Each chunk defines exactly 32
+ * bits of the resultant bitmask.  No chunk may specify a value larger
+ * than 32 bits (%-EOVERFLOW), and if a chunk specifies a smaller value
+ * then leading 0-bits are prepended.  %-EINVAL is returned for illegal
+ * characters. Grouping such as "1,,5", ",44", "," or "" is allowed.
+ * Leading, embedded and trailing whitespace accepted.
+ */
+int bitmap_parse(const char *start, unsigned int buflen,
+		unsigned long *maskp, int nmaskbits)
+{
+	const char *end = strnchrnul(start, buflen, '\n') - 1;
+	int chunks = BITS_TO_U32(nmaskbits);
+	u32 *bitmap = (u32 *)maskp;
+	int unset_bit;
+	int chunk;
+
+	for (chunk = 0; ; chunk++) {
+		end = bitmap_find_region_reverse(start, end);
+		if (start > end)
+			break;
+
+		if (!chunks--)
+			return -EOVERFLOW;
+
+#if defined(CONFIG_64BIT) && defined(__BIG_ENDIAN)
+		end = bitmap_get_x32_reverse(start, end, &bitmap[chunk ^ 1]);
+#else
+		end = bitmap_get_x32_reverse(start, end, &bitmap[chunk]);
+#endif
+		if (IS_ERR(end))
+			return PTR_ERR(end);
+	}
+
+	unset_bit = (BITS_TO_U32(nmaskbits) - chunks) * 32;
+	if (unset_bit < nmaskbits) {
+		bitmap_clear(maskp, unset_bit, nmaskbits - unset_bit);
+		return 0;
+	}
+
+	if (find_next_bit(maskp, unset_bit, nmaskbits) != unset_bit)
+		return -EOVERFLOW;
+
+	return 0;
+}
+EXPORT_SYMBOL(bitmap_parse);
diff --git a/lib/bitmap.c b/lib/bitmap.c
index ddb31015e38ae..09522af227f17 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -6,21 +6,10 @@
 
 #include <linux/bitmap.h>
 #include <linux/bitops.h>
-#include <linux/bug.h>
 #include <linux/ctype.h>
 #include <linux/device.h>
-#include <linux/errno.h>
 #include <linux/export.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
 #include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/thread_info.h>
-#include <linux/uaccess.h>
-
-#include <asm/page.h>
-
-#include "kstrtox.h"
 
 /**
  * DOC: bitmap introduction
@@ -440,508 +429,6 @@ again:
 }
 EXPORT_SYMBOL(bitmap_find_next_zero_area_off);
 
-/*
- * Bitmap printing & parsing functions: first version by Nadia Yvette Chambers,
- * second version by Paul Jackson, third by Joe Korty.
- */
-
-/**
- * bitmap_parse_user - convert an ASCII hex string in a user buffer into a bitmap
- *
- * @ubuf: pointer to user buffer containing string.
- * @ulen: buffer size in bytes.  If string is smaller than this
- *    then it must be terminated with a \0.
- * @maskp: pointer to bitmap array that will contain result.
- * @nmaskbits: size of bitmap, in bits.
- */
-int bitmap_parse_user(const char __user *ubuf,
-			unsigned int ulen, unsigned long *maskp,
-			int nmaskbits)
-{
-	char *buf;
-	int ret;
-
-	buf = memdup_user_nul(ubuf, ulen);
-	if (IS_ERR(buf))
-		return PTR_ERR(buf);
-
-	ret = bitmap_parse(buf, UINT_MAX, maskp, nmaskbits);
-
-	kfree(buf);
-	return ret;
-}
-EXPORT_SYMBOL(bitmap_parse_user);
-
-/**
- * bitmap_print_to_pagebuf - convert bitmap to list or hex format ASCII string
- * @list: indicates whether the bitmap must be list
- * @buf: page aligned buffer into which string is placed
- * @maskp: pointer to bitmap to convert
- * @nmaskbits: size of bitmap, in bits
- *
- * Output format is a comma-separated list of decimal numbers and
- * ranges if list is specified or hex digits grouped into comma-separated
- * sets of 8 digits/set. Returns the number of characters written to buf.
- *
- * It is assumed that @buf is a pointer into a PAGE_SIZE, page-aligned
- * area and that sufficient storage remains at @buf to accommodate the
- * bitmap_print_to_pagebuf() output. Returns the number of characters
- * actually printed to @buf, excluding terminating '\0'.
- */
-int bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp,
-			    int nmaskbits)
-{
-	ptrdiff_t len = PAGE_SIZE - offset_in_page(buf);
-
-	return list ? scnprintf(buf, len, "%*pbl\n", nmaskbits, maskp) :
-		      scnprintf(buf, len, "%*pb\n", nmaskbits, maskp);
-}
-EXPORT_SYMBOL(bitmap_print_to_pagebuf);
-
-/**
- * bitmap_print_to_buf  - convert bitmap to list or hex format ASCII string
- * @list: indicates whether the bitmap must be list
- *      true:  print in decimal list format
- *      false: print in hexadecimal bitmask format
- * @buf: buffer into which string is placed
- * @maskp: pointer to bitmap to convert
- * @nmaskbits: size of bitmap, in bits
- * @off: in the string from which we are copying, We copy to @buf
- * @count: the maximum number of bytes to print
- */
-static int bitmap_print_to_buf(bool list, char *buf, const unsigned long *maskp,
-		int nmaskbits, loff_t off, size_t count)
-{
-	const char *fmt = list ? "%*pbl\n" : "%*pb\n";
-	ssize_t size;
-	void *data;
-
-	data = kasprintf(GFP_KERNEL, fmt, nmaskbits, maskp);
-	if (!data)
-		return -ENOMEM;
-
-	size = memory_read_from_buffer(buf, count, &off, data, strlen(data) + 1);
-	kfree(data);
-
-	return size;
-}
-
-/**
- * bitmap_print_bitmask_to_buf  - convert bitmap to hex bitmask format ASCII string
- * @buf: buffer into which string is placed
- * @maskp: pointer to bitmap to convert
- * @nmaskbits: size of bitmap, in bits
- * @off: in the string from which we are copying, We copy to @buf
- * @count: the maximum number of bytes to print
- *
- * The bitmap_print_to_pagebuf() is used indirectly via its cpumap wrapper
- * cpumap_print_to_pagebuf() or directly by drivers to export hexadecimal
- * bitmask and decimal list to userspace by sysfs ABI.
- * Drivers might be using a normal attribute for this kind of ABIs. A
- * normal attribute typically has show entry as below::
- *
- *   static ssize_t example_attribute_show(struct device *dev,
- * 		struct device_attribute *attr, char *buf)
- *   {
- * 	...
- * 	return bitmap_print_to_pagebuf(true, buf, &mask, nr_trig_max);
- *   }
- *
- * show entry of attribute has no offset and count parameters and this
- * means the file is limited to one page only.
- * bitmap_print_to_pagebuf() API works terribly well for this kind of
- * normal attribute with buf parameter and without offset, count::
- *
- *   bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp,
- * 			   int nmaskbits)
- *   {
- *   }
- *
- * The problem is once we have a large bitmap, we have a chance to get a
- * bitmask or list more than one page. Especially for list, it could be
- * as complex as 0,3,5,7,9,... We have no simple way to know it exact size.
- * It turns out bin_attribute is a way to break this limit. bin_attribute
- * has show entry as below::
- *
- *   static ssize_t
- *   example_bin_attribute_show(struct file *filp, struct kobject *kobj,
- * 		struct bin_attribute *attr, char *buf,
- * 		loff_t offset, size_t count)
- *   {
- * 	...
- *   }
- *
- * With the new offset and count parameters, this makes sysfs ABI be able
- * to support file size more than one page. For example, offset could be
- * >= 4096.
- * bitmap_print_bitmask_to_buf(), bitmap_print_list_to_buf() wit their
- * cpumap wrapper cpumap_print_bitmask_to_buf(), cpumap_print_list_to_buf()
- * make those drivers be able to support large bitmask and list after they
- * move to use bin_attribute. In result, we have to pass the corresponding
- * parameters such as off, count from bin_attribute show entry to this API.
- *
- * The role of cpumap_print_bitmask_to_buf() and cpumap_print_list_to_buf()
- * is similar with cpumap_print_to_pagebuf(),  the difference is that
- * bitmap_print_to_pagebuf() mainly serves sysfs attribute with the assumption
- * the destination buffer is exactly one page and won't be more than one page.
- * cpumap_print_bitmask_to_buf() and cpumap_print_list_to_buf(), on the other
- * hand, mainly serves bin_attribute which doesn't work with exact one page,
- * and it can break the size limit of converted decimal list and hexadecimal
- * bitmask.
- *
- * WARNING!
- *
- * This function is not a replacement for sprintf() or bitmap_print_to_pagebuf().
- * It is intended to workaround sysfs limitations discussed above and should be
- * used carefully in general case for the following reasons:
- *
- *  - Time complexity is O(nbits^2/count), comparing to O(nbits) for snprintf().
- *  - Memory complexity is O(nbits), comparing to O(1) for snprintf().
- *  - @off and @count are NOT offset and number of bits to print.
- *  - If printing part of bitmap as list, the resulting string is not a correct
- *    list representation of bitmap. Particularly, some bits within or out of
- *    related interval may be erroneously set or unset. The format of the string
- *    may be broken, so bitmap_parselist-like parser may fail parsing it.
- *  - If printing the whole bitmap as list by parts, user must ensure the order
- *    of calls of the function such that the offset is incremented linearly.
- *  - If printing the whole bitmap as list by parts, user must keep bitmap
- *    unchanged between the very first and very last call. Otherwise concatenated
- *    result may be incorrect, and format may be broken.
- *
- * Returns the number of characters actually printed to @buf
- */
-int bitmap_print_bitmask_to_buf(char *buf, const unsigned long *maskp,
-				int nmaskbits, loff_t off, size_t count)
-{
-	return bitmap_print_to_buf(false, buf, maskp, nmaskbits, off, count);
-}
-EXPORT_SYMBOL(bitmap_print_bitmask_to_buf);
-
-/**
- * bitmap_print_list_to_buf  - convert bitmap to decimal list format ASCII string
- * @buf: buffer into which string is placed
- * @maskp: pointer to bitmap to convert
- * @nmaskbits: size of bitmap, in bits
- * @off: in the string from which we are copying, We copy to @buf
- * @count: the maximum number of bytes to print
- *
- * Everything is same with the above bitmap_print_bitmask_to_buf() except
- * the print format.
- */
-int bitmap_print_list_to_buf(char *buf, const unsigned long *maskp,
-			     int nmaskbits, loff_t off, size_t count)
-{
-	return bitmap_print_to_buf(true, buf, maskp, nmaskbits, off, count);
-}
-EXPORT_SYMBOL(bitmap_print_list_to_buf);
-
-/*
- * Region 9-38:4/10 describes the following bitmap structure:
- * 0	   9  12    18			38	     N
- * .........****......****......****..................
- *	    ^  ^     ^			 ^	     ^
- *      start  off   group_len	       end	 nbits
- */
-struct region {
-	unsigned int start;
-	unsigned int off;
-	unsigned int group_len;
-	unsigned int end;
-	unsigned int nbits;
-};
-
-static void bitmap_set_region(const struct region *r, unsigned long *bitmap)
-{
-	unsigned int start;
-
-	for (start = r->start; start <= r->end; start += r->group_len)
-		bitmap_set(bitmap, start, min(r->end - start + 1, r->off));
-}
-
-static int bitmap_check_region(const struct region *r)
-{
-	if (r->start > r->end || r->group_len == 0 || r->off > r->group_len)
-		return -EINVAL;
-
-	if (r->end >= r->nbits)
-		return -ERANGE;
-
-	return 0;
-}
-
-static const char *bitmap_getnum(const char *str, unsigned int *num,
-				 unsigned int lastbit)
-{
-	unsigned long long n;
-	unsigned int len;
-
-	if (str[0] == 'N') {
-		*num = lastbit;
-		return str + 1;
-	}
-
-	len = _parse_integer(str, 10, &n);
-	if (!len)
-		return ERR_PTR(-EINVAL);
-	if (len & KSTRTOX_OVERFLOW || n != (unsigned int)n)
-		return ERR_PTR(-EOVERFLOW);
-
-	*num = n;
-	return str + len;
-}
-
-static inline bool end_of_str(char c)
-{
-	return c == '\0' || c == '\n';
-}
-
-static inline bool __end_of_region(char c)
-{
-	return isspace(c) || c == ',';
-}
-
-static inline bool end_of_region(char c)
-{
-	return __end_of_region(c) || end_of_str(c);
-}
-
-/*
- * The format allows commas and whitespaces at the beginning
- * of the region.
- */
-static const char *bitmap_find_region(const char *str)
-{
-	while (__end_of_region(*str))
-		str++;
-
-	return end_of_str(*str) ? NULL : str;
-}
-
-static const char *bitmap_find_region_reverse(const char *start, const char *end)
-{
-	while (start <= end && __end_of_region(*end))
-		end--;
-
-	return end;
-}
-
-static const char *bitmap_parse_region(const char *str, struct region *r)
-{
-	unsigned int lastbit = r->nbits - 1;
-
-	if (!strncasecmp(str, "all", 3)) {
-		r->start = 0;
-		r->end = lastbit;
-		str += 3;
-
-		goto check_pattern;
-	}
-
-	str = bitmap_getnum(str, &r->start, lastbit);
-	if (IS_ERR(str))
-		return str;
-
-	if (end_of_region(*str))
-		goto no_end;
-
-	if (*str != '-')
-		return ERR_PTR(-EINVAL);
-
-	str = bitmap_getnum(str + 1, &r->end, lastbit);
-	if (IS_ERR(str))
-		return str;
-
-check_pattern:
-	if (end_of_region(*str))
-		goto no_pattern;
-
-	if (*str != ':')
-		return ERR_PTR(-EINVAL);
-
-	str = bitmap_getnum(str + 1, &r->off, lastbit);
-	if (IS_ERR(str))
-		return str;
-
-	if (*str != '/')
-		return ERR_PTR(-EINVAL);
-
-	return bitmap_getnum(str + 1, &r->group_len, lastbit);
-
-no_end:
-	r->end = r->start;
-no_pattern:
-	r->off = r->end + 1;
-	r->group_len = r->end + 1;
-
-	return end_of_str(*str) ? NULL : str;
-}
-
-/**
- * bitmap_parselist - convert list format ASCII string to bitmap
- * @buf: read user string from this buffer; must be terminated
- *    with a \0 or \n.
- * @maskp: write resulting mask here
- * @nmaskbits: number of bits in mask to be written
- *
- * Input format is a comma-separated list of decimal numbers and
- * ranges.  Consecutively set bits are shown as two hyphen-separated
- * decimal numbers, the smallest and largest bit numbers set in
- * the range.
- * Optionally each range can be postfixed to denote that only parts of it
- * should be set. The range will divided to groups of specific size.
- * From each group will be used only defined amount of bits.
- * Syntax: range:used_size/group_size
- * Example: 0-1023:2/256 ==> 0,1,256,257,512,513,768,769
- * The value 'N' can be used as a dynamically substituted token for the
- * maximum allowed value; i.e (nmaskbits - 1).  Keep in mind that it is
- * dynamic, so if system changes cause the bitmap width to change, such
- * as more cores in a CPU list, then any ranges using N will also change.
- *
- * Returns: 0 on success, -errno on invalid input strings. Error values:
- *
- *   - ``-EINVAL``: wrong region format
- *   - ``-EINVAL``: invalid character in string
- *   - ``-ERANGE``: bit number specified too large for mask
- *   - ``-EOVERFLOW``: integer overflow in the input parameters
- */
-int bitmap_parselist(const char *buf, unsigned long *maskp, int nmaskbits)
-{
-	struct region r;
-	long ret;
-
-	r.nbits = nmaskbits;
-	bitmap_zero(maskp, r.nbits);
-
-	while (buf) {
-		buf = bitmap_find_region(buf);
-		if (buf == NULL)
-			return 0;
-
-		buf = bitmap_parse_region(buf, &r);
-		if (IS_ERR(buf))
-			return PTR_ERR(buf);
-
-		ret = bitmap_check_region(&r);
-		if (ret)
-			return ret;
-
-		bitmap_set_region(&r, maskp);
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL(bitmap_parselist);
-
-
-/**
- * bitmap_parselist_user() - convert user buffer's list format ASCII
- * string to bitmap
- *
- * @ubuf: pointer to user buffer containing string.
- * @ulen: buffer size in bytes.  If string is smaller than this
- *    then it must be terminated with a \0.
- * @maskp: pointer to bitmap array that will contain result.
- * @nmaskbits: size of bitmap, in bits.
- *
- * Wrapper for bitmap_parselist(), providing it with user buffer.
- */
-int bitmap_parselist_user(const char __user *ubuf,
-			unsigned int ulen, unsigned long *maskp,
-			int nmaskbits)
-{
-	char *buf;
-	int ret;
-
-	buf = memdup_user_nul(ubuf, ulen);
-	if (IS_ERR(buf))
-		return PTR_ERR(buf);
-
-	ret = bitmap_parselist(buf, maskp, nmaskbits);
-
-	kfree(buf);
-	return ret;
-}
-EXPORT_SYMBOL(bitmap_parselist_user);
-
-static const char *bitmap_get_x32_reverse(const char *start,
-					const char *end, u32 *num)
-{
-	u32 ret = 0;
-	int c, i;
-
-	for (i = 0; i < 32; i += 4) {
-		c = hex_to_bin(*end--);
-		if (c < 0)
-			return ERR_PTR(-EINVAL);
-
-		ret |= c << i;
-
-		if (start > end || __end_of_region(*end))
-			goto out;
-	}
-
-	if (hex_to_bin(*end--) >= 0)
-		return ERR_PTR(-EOVERFLOW);
-out:
-	*num = ret;
-	return end;
-}
-
-/**
- * bitmap_parse - convert an ASCII hex string into a bitmap.
- * @start: pointer to buffer containing string.
- * @buflen: buffer size in bytes.  If string is smaller than this
- *    then it must be terminated with a \0 or \n. In that case,
- *    UINT_MAX may be provided instead of string length.
- * @maskp: pointer to bitmap array that will contain result.
- * @nmaskbits: size of bitmap, in bits.
- *
- * Commas group hex digits into chunks.  Each chunk defines exactly 32
- * bits of the resultant bitmask.  No chunk may specify a value larger
- * than 32 bits (%-EOVERFLOW), and if a chunk specifies a smaller value
- * then leading 0-bits are prepended.  %-EINVAL is returned for illegal
- * characters. Grouping such as "1,,5", ",44", "," or "" is allowed.
- * Leading, embedded and trailing whitespace accepted.
- */
-int bitmap_parse(const char *start, unsigned int buflen,
-		unsigned long *maskp, int nmaskbits)
-{
-	const char *end = strnchrnul(start, buflen, '\n') - 1;
-	int chunks = BITS_TO_U32(nmaskbits);
-	u32 *bitmap = (u32 *)maskp;
-	int unset_bit;
-	int chunk;
-
-	for (chunk = 0; ; chunk++) {
-		end = bitmap_find_region_reverse(start, end);
-		if (start > end)
-			break;
-
-		if (!chunks--)
-			return -EOVERFLOW;
-
-#if defined(CONFIG_64BIT) && defined(__BIG_ENDIAN)
-		end = bitmap_get_x32_reverse(start, end, &bitmap[chunk ^ 1]);
-#else
-		end = bitmap_get_x32_reverse(start, end, &bitmap[chunk]);
-#endif
-		if (IS_ERR(end))
-			return PTR_ERR(end);
-	}
-
-	unset_bit = (BITS_TO_U32(nmaskbits) - chunks) * 32;
-	if (unset_bit < nmaskbits) {
-		bitmap_clear(maskp, unset_bit, nmaskbits - unset_bit);
-		return 0;
-	}
-
-	if (find_next_bit(maskp, unset_bit, nmaskbits) != unset_bit)
-		return -EOVERFLOW;
-
-	return 0;
-}
-EXPORT_SYMBOL(bitmap_parse);
-
 /**
  * bitmap_pos_to_ord - find ordinal of set bit at given position in bitmap
  *	@buf: pointer to a bitmap
@@ -988,7 +475,7 @@ static int bitmap_pos_to_ord(const unsigned long *buf, unsigned int pos, unsigne
  * to @dst.
  *
  * The positions of unset bits in @old are mapped to themselves
- * (the identify map).
+ * (the identity map).
  *
  * Apply the above specified mapping to @src, placing the result in
  * @dst, clearing any bits previously set in @dst.
@@ -1037,7 +524,7 @@ EXPORT_SYMBOL(bitmap_remap);
  * the position of the m-th set bit in @new, where m == n % w.
  *
  * The positions of unset bits in @old are mapped to themselves
- * (the identify map).
+ * (the identity map).
  *
  * Apply the above specified mapping to bit position @oldbit, returning
  * the new bit position.
@@ -1220,169 +707,6 @@ void bitmap_fold(unsigned long *dst, const unsigned long *orig,
 }
 #endif /* CONFIG_NUMA */
 
-/*
- * Common code for bitmap_*_region() routines.
- *	bitmap: array of unsigned longs corresponding to the bitmap
- *	pos: the beginning of the region
- *	order: region size (log base 2 of number of bits)
- *	reg_op: operation(s) to perform on that region of bitmap
- *
- * Can set, verify and/or release a region of bits in a bitmap,
- * depending on which combination of REG_OP_* flag bits is set.
- *
- * A region of a bitmap is a sequence of bits in the bitmap, of
- * some size '1 << order' (a power of two), aligned to that same
- * '1 << order' power of two.
- *
- * Returns 1 if REG_OP_ISFREE succeeds (region is all zero bits).
- * Returns 0 in all other cases and reg_ops.
- */
-
-enum {
-	REG_OP_ISFREE,		/* true if region is all zero bits */
-	REG_OP_ALLOC,		/* set all bits in region */
-	REG_OP_RELEASE,		/* clear all bits in region */
-};
-
-static int __reg_op(unsigned long *bitmap, unsigned int pos, int order, int reg_op)
-{
-	int nbits_reg;		/* number of bits in region */
-	int index;		/* index first long of region in bitmap */
-	int offset;		/* bit offset region in bitmap[index] */
-	int nlongs_reg;		/* num longs spanned by region in bitmap */
-	int nbitsinlong;	/* num bits of region in each spanned long */
-	unsigned long mask;	/* bitmask for one long of region */
-	int i;			/* scans bitmap by longs */
-	int ret = 0;		/* return value */
-
-	/*
-	 * Either nlongs_reg == 1 (for small orders that fit in one long)
-	 * or (offset == 0 && mask == ~0UL) (for larger multiword orders.)
-	 */
-	nbits_reg = 1 << order;
-	index = pos / BITS_PER_LONG;
-	offset = pos - (index * BITS_PER_LONG);
-	nlongs_reg = BITS_TO_LONGS(nbits_reg);
-	nbitsinlong = min(nbits_reg,  BITS_PER_LONG);
-
-	/*
-	 * Can't do "mask = (1UL << nbitsinlong) - 1", as that
-	 * overflows if nbitsinlong == BITS_PER_LONG.
-	 */
-	mask = (1UL << (nbitsinlong - 1));
-	mask += mask - 1;
-	mask <<= offset;
-
-	switch (reg_op) {
-	case REG_OP_ISFREE:
-		for (i = 0; i < nlongs_reg; i++) {
-			if (bitmap[index + i] & mask)
-				goto done;
-		}
-		ret = 1;	/* all bits in region free (zero) */
-		break;
-
-	case REG_OP_ALLOC:
-		for (i = 0; i < nlongs_reg; i++)
-			bitmap[index + i] |= mask;
-		break;
-
-	case REG_OP_RELEASE:
-		for (i = 0; i < nlongs_reg; i++)
-			bitmap[index + i] &= ~mask;
-		break;
-	}
-done:
-	return ret;
-}
-
-/**
- * bitmap_find_free_region - find a contiguous aligned mem region
- *	@bitmap: array of unsigned longs corresponding to the bitmap
- *	@bits: number of bits in the bitmap
- *	@order: region size (log base 2 of number of bits) to find
- *
- * Find a region of free (zero) bits in a @bitmap of @bits bits and
- * allocate them (set them to one).  Only consider regions of length
- * a power (@order) of two, aligned to that power of two, which
- * makes the search algorithm much faster.
- *
- * Return the bit offset in bitmap of the allocated region,
- * or -errno on failure.
- */
-int bitmap_find_free_region(unsigned long *bitmap, unsigned int bits, int order)
-{
-	unsigned int pos, end;		/* scans bitmap by regions of size order */
-
-	for (pos = 0 ; (end = pos + (1U << order)) <= bits; pos = end) {
-		if (!__reg_op(bitmap, pos, order, REG_OP_ISFREE))
-			continue;
-		__reg_op(bitmap, pos, order, REG_OP_ALLOC);
-		return pos;
-	}
-	return -ENOMEM;
-}
-EXPORT_SYMBOL(bitmap_find_free_region);
-
-/**
- * bitmap_release_region - release allocated bitmap region
- *	@bitmap: array of unsigned longs corresponding to the bitmap
- *	@pos: beginning of bit region to release
- *	@order: region size (log base 2 of number of bits) to release
- *
- * This is the complement to __bitmap_find_free_region() and releases
- * the found region (by clearing it in the bitmap).
- *
- * No return value.
- */
-void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order)
-{
-	__reg_op(bitmap, pos, order, REG_OP_RELEASE);
-}
-EXPORT_SYMBOL(bitmap_release_region);
-
-/**
- * bitmap_allocate_region - allocate bitmap region
- *	@bitmap: array of unsigned longs corresponding to the bitmap
- *	@pos: beginning of bit region to allocate
- *	@order: region size (log base 2 of number of bits) to allocate
- *
- * Allocate (set bits in) a specified region of a bitmap.
- *
- * Return 0 on success, or %-EBUSY if specified region wasn't
- * free (not all bits were zero).
- */
-int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order)
-{
-	if (!__reg_op(bitmap, pos, order, REG_OP_ISFREE))
-		return -EBUSY;
-	return __reg_op(bitmap, pos, order, REG_OP_ALLOC);
-}
-EXPORT_SYMBOL(bitmap_allocate_region);
-
-/**
- * bitmap_copy_le - copy a bitmap, putting the bits into little-endian order.
- * @dst:   destination buffer
- * @src:   bitmap to copy
- * @nbits: number of bits in the bitmap
- *
- * Require nbits % BITS_PER_LONG == 0.
- */
-#ifdef __BIG_ENDIAN
-void bitmap_copy_le(unsigned long *dst, const unsigned long *src, unsigned int nbits)
-{
-	unsigned int i;
-
-	for (i = 0; i < nbits/BITS_PER_LONG; i++) {
-		if (BITS_PER_LONG == 64)
-			dst[i] = cpu_to_le64(src[i]);
-		else
-			dst[i] = cpu_to_le32(src[i]);
-	}
-}
-EXPORT_SYMBOL(bitmap_copy_le);
-#endif
-
 unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags)
 {
 	return kmalloc_array(BITS_TO_LONGS(nbits), sizeof(unsigned long),
diff --git a/lib/cpumask.c b/lib/cpumask.c
index 34335c1e72653..e77ee9d46f71b 100644
--- a/lib/cpumask.c
+++ b/lib/cpumask.c
@@ -14,7 +14,7 @@
  * @start: the start point of the iteration
  * @wrap: assume @n crossing @start terminates the iteration
  *
- * Returns >= nr_cpu_ids on completion
+ * Return: >= nr_cpu_ids on completion
  *
  * Note: the @wrap argument is required for the start condition when
  * we cannot assume @start is set in @mask.
@@ -48,8 +48,9 @@ EXPORT_SYMBOL(cpumask_next_wrap);
  * @node: memory node from which to allocate or %NUMA_NO_NODE
  *
  * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
- * a nop returning a constant 1 (in <linux/cpumask.h>)
- * Returns TRUE if memory allocation succeeded, FALSE otherwise.
+ * a nop returning a constant 1 (in <linux/cpumask.h>).
+ *
+ * Return: TRUE if memory allocation succeeded, FALSE otherwise.
  *
  * In addition, mask will be NULL if this fails.  Note that gcc is
  * usually smart enough to know that mask can never be NULL if
@@ -115,7 +116,7 @@ void __init free_bootmem_cpumask_var(cpumask_var_t mask)
  * @i: index number
  * @node: local numa_node
  *
- * Returns online CPU according to a numa aware policy; local cpus are returned
+ * Return: online CPU according to a numa aware policy; local cpus are returned
  * first, followed by non-local ones, then it wraps around.
  *
  * For those who wants to enumerate all CPUs based on their NUMA distances,
@@ -163,7 +164,7 @@ static DEFINE_PER_CPU(int, distribute_cpu_mask_prev);
  * Iterated calls using the same srcp1 and srcp2 will be distributed within
  * their intersection.
  *
- * Returns >= nr_cpu_ids if the intersection is empty.
+ * Return: >= nr_cpu_ids if the intersection is empty.
  */
 unsigned int cpumask_any_and_distribute(const struct cpumask *src1p,
 			       const struct cpumask *src2p)
@@ -182,6 +183,12 @@ unsigned int cpumask_any_and_distribute(const struct cpumask *src1p,
 }
 EXPORT_SYMBOL(cpumask_any_and_distribute);
 
+/**
+ * cpumask_any_distribute - Return an arbitrary cpu from srcp
+ * @srcp: &cpumask for selection
+ *
+ * Return: >= nr_cpu_ids if the intersection is empty.
+ */
 unsigned int cpumask_any_distribute(const struct cpumask *srcp)
 {
 	unsigned int next, prev;
diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c
index f2ea9f30c7c5d..65f22c2578b06 100644
--- a/lib/test_bitmap.c
+++ b/lib/test_bitmap.c
@@ -330,6 +330,29 @@ static void __init test_copy(void)
 	expect_eq_pbl("0-108,128-1023", bmap2, 1024);
 }
 
+static void __init test_bitmap_region(void)
+{
+	int pos, order;
+
+	DECLARE_BITMAP(bmap, 1000);
+
+	bitmap_zero(bmap, 1000);
+
+	for (order = 0; order < 10; order++) {
+		pos = bitmap_find_free_region(bmap, 1000, order);
+		if (order == 0)
+			expect_eq_uint(pos, 0);
+		else
+			expect_eq_uint(pos, order < 9 ? BIT(order) : -ENOMEM);
+	}
+
+	bitmap_release_region(bmap, 0, 0);
+	for (order = 1; order < 9; order++)
+		bitmap_release_region(bmap, BIT(order), order);
+
+	expect_eq_uint(bitmap_weight(bmap, 1000), 0);
+}
+
 #define EXP2_IN_BITS	(sizeof(exp2) * 8)
 
 static void __init test_replace(void)
@@ -1227,6 +1250,7 @@ static void __init selftest(void)
 	test_zero_clear();
 	test_fill_set();
 	test_copy();
+	test_bitmap_region();
 	test_replace();
 	test_bitmap_arr32();
 	test_bitmap_arr64();