]> git.baikalelectronics.ru Git - kernel.git/commit
mm: kmemleak: avoid false negatives on vmalloc'ed objects
authorCatalin Marinas <catalin.marinas@arm.com>
Tue, 12 Nov 2013 23:07:45 +0000 (15:07 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 13 Nov 2013 03:09:07 +0000 (12:09 +0900)
commitf7e3848228242eaeb33d70b0f7aec25b18b4fa8c
tree7a515679de2418dbf006bdc40c23b8c6f6b73fce
parent5a53dd7d77f2d6b4902520b999003c9ebd3f34a6
mm: kmemleak: avoid false negatives on vmalloc'ed objects

Commit 95e36f908397 ("mm/vmalloc: remove guard page from between vmap
blocks") had the side effect of making vmap_area.va_end member point to
the next vmap_area.va_start.  This was creating an artificial reference
to vmalloc'ed objects and kmemleak was rarely reporting vmalloc() leaks.

This patch marks the vmap_area containing pointers explicitly and
reduces the min ref_count to 2 as vm_struct still contains a reference
to the vmalloc'ed object.  The kmemleak add_scan_area() function has
been improved to allow a SIZE_MAX argument covering the rest of the
object (for simpler calling sites).

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/kmemleak.c
mm/vmalloc.c