From: Catalin Marinas <catalin.marinas@arm.com>
Date: Wed, 28 Oct 2009 13:33:08 +0000 (+0000)
Subject: kmemleak: Do not use off-slab management with SLAB_NOLEAKTRACE
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e7cb55b946a2182c347047dc903c6ed0daef100c;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

kmemleak: Do not use off-slab management with SLAB_NOLEAKTRACE

With the slab allocator, if off-slab management is enabled for the
kmem_caches used by kmemleak, it leads to recursive calls into
kmemleak_alloc(). Off-slab management can be triggered by other config
options increasing the slab size, e.g. DEBUG_PAGEALLOC.

Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---

diff --git a/mm/slab.c b/mm/slab.c
index 7dfa481c96ba..646db3085193 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2261,9 +2261,11 @@ kmem_cache_create (const char *name, size_t size, size_t align,
 	/*
 	 * Determine if the slab management is 'on' or 'off' slab.
 	 * (bootstrapping cannot cope with offslab caches so don't do
-	 * it too early on.)
+	 * it too early on. Always use on-slab management when
+	 * SLAB_NOLEAKTRACE to avoid recursive calls into kmemleak)
 	 */
-	if ((size >= (PAGE_SIZE >> 3)) && !slab_early_init)
+	if ((size >= (PAGE_SIZE >> 3)) && !slab_early_init &&
+	    !(flags & SLAB_NOLEAKTRACE))
 		/*
 		 * Size is large, assume best to place the slab management obj
 		 * off-slab (should allow better packing of objs).