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| author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-07 08:44:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-07 08:44:24 -0700 |
| commit | e3ebadd95cb621e2c7436f3d3646447ac9d5c16d (patch) | |
| tree | 510b41550cc3751cfb565e3e2ba195a68b784a03 /arch/x86_64/mm/ioremap.c | |
| parent | 15700770ef7c5d12e2f1659d2ddbeb3f658d9f37 (diff) | |
| download | linux-e3ebadd95cb621e2c7436f3d3646447ac9d5c16d.tar.gz | |
Revert "[PATCH] x86: __pa and __pa_symbol address space separation"
This was broken. It adds complexity, for no good reason. Rather than
separate __pa() and __pa_symbol(), we should deprecate __pa_symbol(),
and preferably __pa() too - and just use "virt_to_phys()" instead, which
is more readable and has nicer semantics.
However, right now, just undo the separation, and make __pa_symbol() be
the exact same as __pa(). That fixes the bugs this patch introduced,
and we can do the fairly obvious cleanups later.
Do the new __phys_addr() function (which is now the actual workhorse for
the unified __pa()/__pa_symbol()) as a real external function, that way
all the potential issues with compile/link-time optimizations of
constant symbol addresses go away, and we can also, if we choose to, add
more sanity-checking of the argument.
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86_64/mm/ioremap.c')
| -rw-r--r-- | arch/x86_64/mm/ioremap.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86_64/mm/ioremap.c b/arch/x86_64/mm/ioremap.c index c6e5e8d401a490..6cac90aa5032aa 100644 --- a/arch/x86_64/mm/ioremap.c +++ b/arch/x86_64/mm/ioremap.c @@ -13,12 +13,21 @@ #include <linux/slab.h> #include <linux/module.h> #include <linux/io.h> + #include <asm/pgalloc.h> #include <asm/fixmap.h> #include <asm/tlbflush.h> #include <asm/cacheflush.h> #include <asm/proto.h> +unsigned long __phys_addr(unsigned long x) +{ + if (x >= __START_KERNEL_map) + return x - __START_KERNEL_map + phys_base; + return x - PAGE_OFFSET; +} +EXPORT_SYMBOL(__phys_addr); + #define ISA_START_ADDRESS 0xa0000 #define ISA_END_ADDRESS 0x100000 |