include/linux/mm.h: fix typo in VM_MPX definition
authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Tue, 3 Oct 2017 23:14:24 +0000 (16:14 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 4 Oct 2017 00:54:23 +0000 (17:54 -0700)
commitfa87b91c94a8fd2c8502b6761be2d08a8e9bcf55
tree0dc96017b32d126a005180d63c9e54dd75b2acad
parente00e5a26e3d37b47ce8ca59611db1e6135790ef8
include/linux/mm.h: fix typo in VM_MPX definition

There's a typo in recent change of VM_MPX definition.  We want it to be
VM_HIGH_ARCH_4, not VM_HIGH_ARCH_BIT_4.

This bug does cause visible regressions.  In arch_vma_name the vmflags
are tested against VM_MPX.  With the incorrect value of VM_MPX, a number
of vmas (such as the stack) test positive and end up being marked as
"[mpx]" in /proc/N/maps instead of their correct names.

This confuses tools like rr which expect to be able to find familiar
vmas.

Fixes: df3735c5b40f ("x86,mpx: make mpx depend on x86-64 to free up VMA flag")
Link: http://lkml.kernel.org/r/20170918140253.36856-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Kyle Huey <me@kylehuey.com>
Cc: <stable@vger.kernel.org> [4.14+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/mm.h