diff options
author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2014-08-03 20:02:03 +0900 |
---|---|---|
committer | Ben Hutchings <ben@decadent.org.uk> | 2014-09-13 23:41:43 +0100 |
commit | 312b559d9e61b473b39d3dc05fe0db43c2df60fb (patch) | |
tree | 6855c1414c49f8e026b8385bc88d007d04d3fb2f /arch/powerpc/mm/numa.c | |
parent | 0d362ea03048606016efe050bdcc46ff87ae4506 (diff) | |
download | kernel_samsung_smdk4412-312b559d9e61b473b39d3dc05fe0db43c2df60fb.zip kernel_samsung_smdk4412-312b559d9e61b473b39d3dc05fe0db43c2df60fb.tar.gz kernel_samsung_smdk4412-312b559d9e61b473b39d3dc05fe0db43c2df60fb.tar.bz2 |
drm/ttm: Fix possible stack overflow by recursive shrinker calls.
commit 71336e011d1d2312bcbcaa8fcec7365024f3a95d upstream.
While ttm_dma_pool_shrink_scan() tries to take mutex before doing GFP_KERNEL
allocation, ttm_pool_shrink_scan() does not do it. This can result in stack
overflow if kmalloc() in ttm_page_pool_free() triggered recursion due to
memory pressure.
shrink_slab()
=> ttm_pool_shrink_scan()
=> ttm_page_pool_free()
=> kmalloc(GFP_KERNEL)
=> shrink_slab()
=> ttm_pool_shrink_scan()
=> ttm_page_pool_free()
=> kmalloc(GFP_KERNEL)
Change ttm_pool_shrink_scan() to do like ttm_dma_pool_shrink_scan() does.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Dave Airlie <airlied@redhat.com>
[bwh: Backported to 3.2:
- Adjust context
- Change return value in the contended case to follow the old shrinker
API]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch/powerpc/mm/numa.c')
0 files changed, 0 insertions, 0 deletions