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Date: Mon, 26 Feb 2018 23:35:19 +0300
From: Alexey Dobriyan <adobriyan@gmail.com>
Subject: [PATCH] slab: mark kmalloc machinery as __ro_after_init
Message-ID: <20180226203519.GA6886@avx2>
References: <20180226203011.GA6510@avx2>
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To: akpm@linux-foundation.org
Cc: linux-mm@kvack.org

kmalloc caches aren't relocated after being set up neither does
"size_index" array.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

 mm/slab_common.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -10,6 +10,7 @@
 #include <linux/poison.h>
 #include <linux/interrupt.h>
 #include <linux/memory.h>
+#include <linux/cache.h>
 #include <linux/compiler.h>
 #include <linux/module.h>
 #include <linux/cpu.h>
@@ -954,11 +955,11 @@ struct kmem_cache *__init create_kmalloc_cache(const char *name, size_t size,
 	return s;
 }
 
-struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
+struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1] __ro_after_init;
 EXPORT_SYMBOL(kmalloc_caches);
 
 #ifdef CONFIG_ZONE_DMA
-struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1];
+struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1] __ro_after_init;
 EXPORT_SYMBOL(kmalloc_dma_caches);
 #endif
 
@@ -968,7 +969,7 @@ EXPORT_SYMBOL(kmalloc_dma_caches);
  * of two cache sizes there. The size of larger slabs can be determined using
  * fls.
  */
-static s8 size_index[24] = {
+static s8 size_index[24] __ro_after_init = {
 	3,	/* 8 */
 	4,	/* 16 */
 	5,	/* 24 */

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