From: Toshi Kani <[email protected]> shmem_get_unmapped_area() checks SHMEM_SB(sb)->huge incorrectly, which leads to a reversed effect of "huge=" mount option.
Fix the check in shmem_get_unmapped_area(). Note, the default value of SHMEM_SB(sb)->huge remains as SHMEM_HUGE_NEVER. User will need to specify "huge=" option to enable huge page mappings. Reported-by: Hillf Danton <[email protected]> Signed-off-by: Toshi Kani <[email protected]> Acked-by: Kirill A. Shutemov <[email protected]> Reviewed-by: Aneesh Kumar K.V <[email protected]> Signed-off-by: Hugh Dickins <[email protected]> --- mm/shmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- 4.8-rc7/mm/shmem.c 2016-08-14 20:17:02.388843463 -0700 +++ linux/mm/shmem.c 2016-09-22 19:41:29.057848626 -0700 @@ -1980,7 +1980,7 @@ unsigned long shmem_get_unmapped_area(st return addr; sb = shm_mnt->mnt_sb; } - if (SHMEM_SB(sb)->huge != SHMEM_HUGE_NEVER) + if (SHMEM_SB(sb)->huge == SHMEM_HUGE_NEVER) return addr; }
