From: Catalin Marinas <catalin.marinas@arm.com>
Date: Tue, 12 Nov 2013 23:07:45 +0000 (-0800)
Subject: mm: kmemleak: avoid false negatives on vmalloc'ed objects
X-Git-Tag: v3.2.64~241
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dc47dfd2bdcd9d46fc80c0fc48cd70274b464f60;p=pandora-kernel.git

mm: kmemleak: avoid false negatives on vmalloc'ed objects

commit 7f88f88f83ed609650a01b18572e605ea50cd163 upstream.

Commit 248ac0e1943a ("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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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