mm/mlock.c: change count_mm_mlocked_page_nr return type
authorswkhack <swkhack@gmail.com>
Thu, 13 Jun 2019 22:56:08 +0000 (15:56 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 14 Jun 2019 03:34:56 +0000 (17:34 -1000)
commit0874bb49bb21bf24deda853e8bf61b8325e24bcb
tree965fb2ebfe60c6dd4541724ea29c74424e4bede9
parent7a30df49f63ad92318ddf1f7498d1129a77dd4bd
mm/mlock.c: change count_mm_mlocked_page_nr return type

On a 64-bit machine the value of "vma->vm_end - vma->vm_start" may be
negative when using 32 bit ints and the "count >> PAGE_SHIFT"'s result
will be wrong.  So change the local variable and return value to
unsigned long to fix the problem.

Link: http://lkml.kernel.org/r/20190513023701.83056-1-swkhack@gmail.com
Fixes: 0cf2f6f6dc60 ("mm: mlock: check against vma for actual mlock() size")
Signed-off-by: swkhack <swkhack@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/mlock.c