linux-kernel - Re: next-20160401+: ARM: DRA7: linux-next regression: mm/slab: clean-up kmem_cache

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Date:	Mon, 11 Apr 2016 11:02:03 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Nishanth Menon <nm@...com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	linux-omap <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-next <linux-next@...r.kernel.org>
Subject: Re: next-20160401+: ARM: DRA7: linux-next regression: mm/slab:
 clean-up kmem_cache_node setup

On Fri, Apr 08, 2016 at 03:39:20PM -0500, Nishanth Menon wrote:
> Hi,
> 
> http://marc.info/?l=linux-omap&m=146014314115625&w=2 series works with
> v4.6-rc2 kernel, however, it fails with linux-next for suspend-to-ram
> (mem) on BeagleBoard-X15
> 
> next-20160327 - good
> next-20160329 - good
> next-20160330 - Fails to boot - I2C crashes
> next-20160331-  Fails to boot - USB crashes
> next-20160401 -> bad
> next-20160408 -> bad
> 
> Bisect log of next-20160408 vs v4.6-rc2 ->
> http://pastebin.ubuntu.com/15697856/
> 
> # first bad commit: [2b629704a2b6a5b239f23750e5517a9d8c3a4e8c]
> mm/slab: clean-up kmem_cache_node setup
> 

Hello,

I made a mistake on that patch. Could you try to test below one on
top of it.

Thanks.

--------->8----------------
>From d3af3cc409527e9be6beb62ea395cde67f3c5029 Mon Sep 17 00:00:00 2001
From: Joonsoo Kim <iamjoonsoo.kim@....com>
Date: Mon, 11 Apr 2016 10:48:29 +0900
Subject: [PATCH] mm/slab: clean-up kmem_cache_node setup-fix

After calling free_block(), we need to re-calculate array_cache's
avail counter. Fix it.

And, it's better to free objects in shared array when it is
really necessary. Check it before calling free_block().

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/slab.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/slab.c b/mm/slab.c
index fcd5fbb..27cb390 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -927,9 +927,10 @@ static int setup_kmem_cache_node(struct kmem_cache *cachep,
 
 	n = get_node(cachep, node);
 	spin_lock_irq(&n->list_lock);
-	if (n->shared) {
+	if (n->shared && force_change) {
 		free_block(cachep, n->shared->entry,
 				n->shared->avail, node, &list);
+		n->shared->avail = 0;
 	}
 
 	if (!n->shared || force_change) {
-- 
1.9.1