Commit 5d8b3cc2 authored by Kirill A. Shutemov's avatar Kirill A. Shutemov Committed by Greg Kroah-Hartman

mm, shmem: fix handling /sys/kernel/mm/transparent_hugepage/shmem_enabled

commit 435c0b87 upstream.

/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: 5a6e75f8 ("shmem: prepare huge= mount option and sysfs knob")
Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8d362cb3
......@@ -3810,7 +3810,7 @@ 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 */
......@@ -3871,7 +3871,7 @@ 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;
}
......
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