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authorAlexey Dobriyan <adobriyan@gmail.com>2018-04-06 02:20:48 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-06 07:36:23 +0300
commiteb7235eb842043ca302e992286ca6af63a8127fe (patch)
tree44d3ff91546e6492dbaae7567cf3b8b73ffcf18c /mm/slub.c
parentac914d08bbb6afdc089ca6651af1988533c9786c (diff)
downloadlinux-eb7235eb842043ca302e992286ca6af63a8127fe.tar.xz
slub: make ->remote_node_defrag_ratio unsigned int
->remote_node_defrag_ratio is in range 0..1000. This also adds a check and modifies the behavior to return an error code. Before this patch invalid values were ignored. Link: http://lkml.kernel.org/r/20180305200730.15812-9-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>
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 495c785c8d7e..97dd2db30acb 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5289,21 +5289,22 @@ SLAB_ATTR(shrink);
#ifdef CONFIG_NUMA
static ssize_t remote_node_defrag_ratio_show(struct kmem_cache *s, char *buf)
{
- return sprintf(buf, "%d\n", s->remote_node_defrag_ratio / 10);
+ return sprintf(buf, "%u\n", s->remote_node_defrag_ratio / 10);
}
static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s,
const char *buf, size_t length)
{
- unsigned long ratio;
+ unsigned int ratio;
int err;
- err = kstrtoul(buf, 10, &ratio);
+ err = kstrtouint(buf, 10, &ratio);
if (err)
return err;
+ if (ratio > 100)
+ return -ERANGE;
- if (ratio <= 100)
- s->remote_node_defrag_ratio = ratio * 10;
+ s->remote_node_defrag_ratio = ratio * 10;
return length;
}