linux-kernel - [PATCH v2 3/3] mm/slab: Fix /proc/slabinfo unwriteable for slab

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Date:	Thu, 27 Jun 2013 08:41:40 +0800
From:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
To:	Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>
Cc:	Glauber Costa <glommer@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <js1304@...il.com>,
	David Rientjes <rientjes@...gle.com>, lllllinux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Subject: [PATCH v2 3/3] mm/slab: Fix /proc/slabinfo unwriteable for slab

Slab have some tunables like limit, batchcount, and sharedfactor can be
tuned through function slabinfo_write. Commit (b7454ad3: mm/sl[au]b: Move
slabinfo processing to slab_common.c) uncorrectly change /proc/slabinfo
unwriteable for slab, this patch fix it by revert to original mode.

Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
---
 mm/slab_common.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 4ee4325..d41ff76 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -631,10 +631,20 @@ static const struct file_operations proc_slabinfo_operations = {
 	.release	= seq_release,
 };
 
+#ifdef CONFIG_SLAB
+static int __init slab_proc_init(void)
+{
+	proc_create("slabinfo", S_IWUSR | S_IRUSR, NULL, &proc_slabinfo_operations);
+	return 0;
+}
+#endif
+#ifdef CONFIG_SLUB
 static int __init slab_proc_init(void)
 {
 	proc_create("slabinfo", S_IRUSR, NULL, &proc_slabinfo_operations);
 	return 0;
 }
+#endif
+
 module_init(slab_proc_init);
 #endif /* CONFIG_SLABINFO */
-- 
1.8.1.2

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