From: Michal Hocko <mhocko@xxxxxxxx> Subject: drm/radeon: make radeon_mn_get wait for mmap_sem killable radeon_mn_get which is called during ioct path relies on mmap_sem for write. If the waiting task gets killed by the oom killer it would block oom_reaper from asynchronous address space reclaim and reduce the chances of timely OOM resolving. Wait for the lock in the killable mode and return with EINTR if the task got killed while waiting. Signed-off-by: Michal Hocko <mhocko@xxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> Reviewed-by: Christian König <christian.koenig@xxxxxxx> Cc: Alex Deucher <alexander.deucher@xxxxxxx> Cc: David Airlie <airlied@xxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/radeon/radeon_mn.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff -puN drivers/gpu/drm/radeon/radeon_mn.c~drm-radeon-make-radeon_mn_get-wait-for-mmap_sem-killable drivers/gpu/drm/radeon/radeon_mn.c --- a/drivers/gpu/drm/radeon/radeon_mn.c~drm-radeon-make-radeon_mn_get-wait-for-mmap_sem-killable +++ a/drivers/gpu/drm/radeon/radeon_mn.c @@ -186,7 +186,9 @@ static struct radeon_mn *radeon_mn_get(s struct radeon_mn *rmn; int r; - down_write(&mm->mmap_sem); + if (down_write_killable(&mm->mmap_sem)) + return ERR_PTR(-EINTR); + mutex_lock(&rdev->mn_lock); hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm) _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
