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UPSTREAM: zram/zcomp: do not zero out zcomp private pages

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Do not __GFP_ZERO allocated zcomp ->private pages.  We keep allocated
streams around and use them for read/write requests, so we supply a
zeroed out ->private to compression algorithm as a scratch buffer only
once -- the first time we use that stream.  For the rest of IO requests
served by this stream ->private usually contains some temporarily data
from the previous requests.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

(cherry picked from commit e02d238c98)
Signed-off-by: Peter Kalauskas <peskal@google.com>
Bug: 112488418
Change-Id: I911832da703f596998a4139d6033ef1564848c9e
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
This commit is contained in:
Sergey Senozhatsky
2016-01-14 15:22:35 -08:00
committed by Amit Pundir
parent 711c8927f8
commit 2fafbdf79e
2 changed files with 4 additions and 4 deletions
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4
drivers/block/zram/zcomp_lz4.c
View File

@@ -19,10 +19,10 @@ static void *zcomp_lz4_create(gfp_t flags)
{
void *ret;
ret = kzalloc(LZ4_MEM_COMPRESS, flags);
ret = kmalloc(LZ4_MEM_COMPRESS, flags);
if (!ret)
ret = __vmalloc(LZ4_MEM_COMPRESS,
flags | __GFP_ZERO | __GFP_HIGHMEM,
flags | __GFP_HIGHMEM,
PAGE_KERNEL);
return ret;
}

4
drivers/block/zram/zcomp_lzo.c
View File

@@ -19,10 +19,10 @@ static void *lzo_create(gfp_t flags)
{
void *ret;
ret = kzalloc(LZO1X_MEM_COMPRESS, flags);
ret = kmalloc(LZO1X_MEM_COMPRESS, flags);
if (!ret)
ret = __vmalloc(LZO1X_MEM_COMPRESS,
flags | __GFP_ZERO | __GFP_HIGHMEM,
flags | __GFP_HIGHMEM,
PAGE_KERNEL);
return ret;
}