linux-hardening - [PATCH v2 7/9] slab: Introduce kmem_buckets

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Date: Tue,  5 Mar 2024 02:10:23 -0800
From: Kees Cook <keescook@...omium.org>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Kees Cook <keescook@...omium.org>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Hyeonggon Yoo <42.hyeyoo@...il.com>,
	linux-mm@...ck.org,
	"GONG, Ruiqi" <gongruiqi@...weicloud.com>,
	Xiu Jianfeng <xiujianfeng@...wei.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	Jann Horn <jannh@...gle.com>,
	Matteo Rizzo <matteorizzo@...gle.com>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH v2 7/9] slab: Introduce kmem_buckets_valloc()

For allocations that may need to fallback to vmalloc, add
kmem_buckets_valloc().

Signed-off-by: Kees Cook <keescook@...omium.org>
---
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Roman Gushchin <roman.gushchin@...ux.dev>
Cc: Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc: linux-mm@...ck.org
---
 include/linux/slab.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 7d84f875dcf4..0cf72861d5fa 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -740,6 +740,12 @@ static inline __alloc_size(1) void *kzalloc_node(size_t size, gfp_t flags, int n
 void * __alloc_size(2)
 __kvmalloc_node(kmem_buckets *b, size_t size, gfp_t flags, int node);
 
+static __always_inline __alloc_size(2)
+void *kmem_buckets_valloc(kmem_buckets *b, size_t size, gfp_t flags)
+{
+	return __kvmalloc_node(b, size, flags, NUMA_NO_NODE);
+}
+
 static inline __alloc_size(1) void *kvmalloc_node(size_t size, gfp_t flags, int node)
 {
 	return __kvmalloc_node(NULL, size, flags, node);
-- 
2.34.1