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

commit 435c0b87d661da83771c30ed775f7c37eed193fb 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: 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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/mm/shmem.c b/mm/shmem.c
index 7ee5444ffb6dd7a0847a76ec1541dd4c667446af..004e0f87e8a8b6e584c886e7a3420ae331f01568 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -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;
 }