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| author | Michal Hocko <mhocko@suse.com> | 2017-05-08 15:57:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-08 17:15:13 -0700 |
| commit | 19809c2da28aee5860ad9a2eff760730a0710df0 (patch) | |
| tree | 19c6c68f96d55ea25b71040a448c6890301a19f6 /drivers | |
| parent | 54f180d3c181277457fb003dd9524c2aa1ef8160 (diff) | |
| download | linux-stable-19809c2da28aee5860ad9a2eff760730a0710df0.tar.gz linux-stable-19809c2da28aee5860ad9a2eff760730a0710df0.tar.bz2 linux-stable-19809c2da28aee5860ad9a2eff760730a0710df0.zip | |
mm, vmalloc: use __GFP_HIGHMEM implicitly
__vmalloc* allows users to provide gfp flags for the underlying
allocation. This API is quite popular
$ git grep "=[[:space:]]__vmalloc\|return[[:space:]]*__vmalloc" | wc -l
77
The only problem is that many people are not aware that they really want
to give __GFP_HIGHMEM along with other flags because there is really no
reason to consume precious lowmemory on CONFIG_HIGHMEM systems for pages
which are mapped to the kernel vmalloc space. About half of users don't
use this flag, though. This signals that we make the API unnecessarily
too complex.
This patch simply uses __GFP_HIGHMEM implicitly when allocating pages to
be mapped to the vmalloc space. Current users which add __GFP_HIGHMEM
are simplified and drop the flag.
Link: http://lkml.kernel.org/r/20170307141020.29107-1-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: Cristopher Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/drbd/drbd_bitmap.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/etnaviv/etnaviv_dump.c | 4 | ||||
| -rw-r--r-- | drivers/md/dm-bufio.c | 2 |
3 files changed, 4 insertions, 4 deletions
diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c index dece26f119d4..a804a4107fbc 100644 --- a/drivers/block/drbd/drbd_bitmap.c +++ b/drivers/block/drbd/drbd_bitmap.c @@ -409,7 +409,7 @@ static struct page **bm_realloc_pages(struct drbd_bitmap *b, unsigned long want) new_pages = kzalloc(bytes, GFP_NOIO | __GFP_NOWARN); if (!new_pages) { new_pages = __vmalloc(bytes, - GFP_NOIO | __GFP_HIGHMEM | __GFP_ZERO, + GFP_NOIO | __GFP_ZERO, PAGE_KERNEL); if (!new_pages) return NULL; diff --git a/drivers/gpu/drm/etnaviv/etnaviv_dump.c b/drivers/gpu/drm/etnaviv/etnaviv_dump.c index d019b5e311cc..2d955d7d7b6d 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_dump.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_dump.c @@ -161,8 +161,8 @@ void etnaviv_core_dump(struct etnaviv_gpu *gpu) file_size += sizeof(*iter.hdr) * n_obj; /* Allocate the file in vmalloc memory, it's likely to be big */ - iter.start = __vmalloc(file_size, GFP_KERNEL | __GFP_HIGHMEM | - __GFP_NOWARN | __GFP_NORETRY, PAGE_KERNEL); + iter.start = __vmalloc(file_size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY, + PAGE_KERNEL); if (!iter.start) { dev_warn(gpu->dev, "failed to allocate devcoredump file\n"); return; diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c index c92c31b23e54..5db11a405129 100644 --- a/drivers/md/dm-bufio.c +++ b/drivers/md/dm-bufio.c @@ -406,7 +406,7 @@ static void *alloc_buffer_data(struct dm_bufio_client *c, gfp_t gfp_mask, if (gfp_mask & __GFP_NORETRY) noio_flag = memalloc_noio_save(); - ptr = __vmalloc(c->block_size, gfp_mask | __GFP_HIGHMEM, PAGE_KERNEL); + ptr = __vmalloc(c->block_size, gfp_mask, PAGE_KERNEL); if (gfp_mask & __GFP_NORETRY) memalloc_noio_restore(noio_flag); |