From: Alexey Dobriyan <adobriyan@gmail.com>
Date: Mon, 28 Jan 2019 19:31:17 +0000 (-0800)
Subject: slub: make ->cpu_partial unsigned
X-Git-Tag: v4.1.12-124.31.3~281
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=cfc59a43b7fda8745aca747f9c80c07575edb387;p=users%2Fjedix%2Flinux-maple.git

slub: make ->cpu_partial unsigned

	/*
	 * cpu_partial determined the maximum number of objects
	 * kept in the per cpu partial lists of a processor.
	 */

Can't be negative.

Orabug: 28620592

We can't reproduce the issue, this patch is expected to help in theory.

Link: http://lkml.kernel.org/r/20180305200730.15812-15-adobriyan@gmail.com
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Reviewed-by: John Sobecki <john.sobecki@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>
---

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 33885118523c..311cb45124b7 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -67,7 +67,8 @@ struct kmem_cache {
 	int size;		/* The size of an object including meta data */
 	int object_size;	/* The size of an object without meta data */
 	int offset;		/* Free pointer offset. */
-	int cpu_partial;	/* Number of per cpu partial objects to keep around */
+	/* Number of per cpu partial objects to keep around */
+	UEK_KABI_REPLACE(int cpu_partial, unsigned int cpu_partial)
 	struct kmem_cache_order_objects oo;
 
 	/* Allocation and freeing of slabs */
diff --git a/mm/slub.c b/mm/slub.c
index 3d7932cc7084..0419962fff24 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1619,7 +1619,7 @@ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n,
 {
 	struct page *page, *page2;
 	void *object = NULL;
-	int available = 0;
+	unsigned int available = 0;
 	int objects;
 
 	/*
@@ -4460,10 +4460,10 @@ static ssize_t cpu_partial_show(struct kmem_cache *s, char *buf)
 static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf,
 				 size_t length)
 {
-	unsigned long objects;
+	unsigned int objects;
 	int err;
 
-	err = kstrtoul(buf, 10, &objects);
+	err = kstrtouint(buf, 10, &objects);
 	if (err)
 		return err;
 	if (objects && !kmem_cache_has_cpu_partial(s))