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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2017-08-25 15:55:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-08-25 16:12:46 -0700
commit435c0b87d661da83771c30ed775f7c37eed193fb (patch)
treefa01aec77d23c086e9f23650f12bc16ce94d5ff9 /mm
parent556b969a1cfe2686aae149137fa1dfcac0eefe54 (diff)
mm, shmem: fix handling /sys/kernel/mm/transparent_hugepage/shmem_enabled
/sys/kernel/mm/transparent_hugepage/shmem_enabled controls if we want to allocate huge pages when allocate pages for private in-kernel shmem mount. Unfortunately, as Dan noticed, I've screwed it up and the only way to make kernel allocate huge page for the mount is to use "force" there. All other values will be effectively ignored. Link: http://lkml.kernel.org/r/20170822144254.66431-1-kirill.shutemov@linux.intel.com Fixes: 5a6e75f8110c ("shmem: prepare huge= mount option and sysfs knob") Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: stable <stable@vger.kernel.org> [4.8+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/shmem.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 6540e5982444..fbcb3c96a186 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3967,7 +3967,7 @@ int __init shmem_init(void)
}
#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE
- if (has_transparent_hugepage() && shmem_huge < SHMEM_HUGE_DENY)
+ if (has_transparent_hugepage() && shmem_huge > SHMEM_HUGE_DENY)
SHMEM_SB(shm_mnt->mnt_sb)->huge = shmem_huge;
else
shmem_huge = 0; /* just in case it was patched */
@@ -4028,7 +4028,7 @@ static ssize_t shmem_enabled_store(struct kobject *kobj,
return -EINVAL;
shmem_huge = huge;
- if (shmem_huge < SHMEM_HUGE_DENY)
+ if (shmem_huge > SHMEM_HUGE_DENY)
SHMEM_SB(shm_mnt->mnt_sb)->huge = shmem_huge;
return count;
}