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| author | Mikulas Patocka <mpatocka@redhat.com> | 2023-06-26 16:48:40 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@kernel.org> | 2023-06-27 16:06:54 -0400 |
| commit | e2c789cab60a493a72b42cb53eb5fbf96d5f1ae3 (patch) | |
| tree | f2c2f042efe62606e30f482a25e60cdefbdbfe23 | |
| parent | 3be1622895af25101f7046ed0b2286bead2219d4 (diff) | |
| download | livepatching-e2c789cab60a493a72b42cb53eb5fbf96d5f1ae3.tar.gz | |
dm: get rid of GFP_NOIO workarounds for __vmalloc and kvmalloc
In the past, the function __vmalloc didn't respect the GFP flags - it
allocated memory with the provided gfp flags, but it allocated page tables
with GFP_KERNEL. This was fixed in commit 451769ebb7e7 ("mm/vmalloc:
alloc GFP_NO{FS,IO} for vmalloc") so the memalloc_noio_{save,restore}
workaround is no longer needed.
The function kvmalloc didn't like flags different from GFP_KERNEL. This
was fixed in commit a421ef303008 ("mm: allow !GFP_KERNEL allocations
for kvmalloc"), so kvmalloc can now be called with GFP_NOIO.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
| -rw-r--r-- | drivers/md/dm-bufio.c | 17 | ||||
| -rw-r--r-- | drivers/md/dm-ioctl.c | 5 |
2 files changed, 1 insertions, 21 deletions
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c index a7079b38756ab6..bc309e41d074ae 100644 --- a/drivers/md/dm-bufio.c +++ b/drivers/md/dm-bufio.c @@ -1157,23 +1157,6 @@ static void *alloc_buffer_data(struct dm_bufio_client *c, gfp_t gfp_mask, *data_mode = DATA_MODE_VMALLOC; - /* - * __vmalloc allocates the data pages and auxiliary structures with - * gfp_flags that were specified, but pagetables are always allocated - * with GFP_KERNEL, no matter what was specified as gfp_mask. - * - * Consequently, we must set per-process flag PF_MEMALLOC_NOIO so that - * all allocations done by this process (including pagetables) are done - * as if GFP_NOIO was specified. - */ - if (gfp_mask & __GFP_NORETRY) { - unsigned int noio_flag = memalloc_noio_save(); - void *ptr = __vmalloc(c->block_size, gfp_mask); - - memalloc_noio_restore(noio_flag); - return ptr; - } - return __vmalloc(c->block_size, gfp_mask); } diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 16244a7b193c0a..8e14a4a0996d98 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1932,7 +1932,6 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern struct dm_ioctl *dmi; int secure_data; const size_t minimum_data_size = offsetof(struct dm_ioctl, data); - unsigned int noio_flag; /* check_version() already copied version from userspace, avoid TOCTOU */ if (copy_from_user((char *)param_kernel + sizeof(param_kernel->version), @@ -1962,9 +1961,7 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern * Use kmalloc() rather than vmalloc() when we can. */ dmi = NULL; - noio_flag = memalloc_noio_save(); - dmi = kvmalloc(param_kernel->data_size, GFP_KERNEL | __GFP_HIGH); - memalloc_noio_restore(noio_flag); + dmi = kvmalloc(param_kernel->data_size, GFP_NOIO | __GFP_HIGH); if (!dmi) { if (secure_data && clear_user(user, param_kernel->data_size)) |