linux-kernel - [RFC PATCH 02/11] slab: add private memory allocator header for arch/lib

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Message-Id: <1427202642-1716-3-git-send-email-tazaki@sfc.wide.ad.jp>
Date:	Tue, 24 Mar 2015 22:10:33 +0900
From:	Hajime Tazaki <tazaki@....wide.ad.jp>
To:	linux-arch@...r.kernel.org
Cc:	Hajime Tazaki <tazaki@....wide.ad.jp>,
	Arnd Bergmann <arnd@...db.de>,
	Jonathan Corbet <corbet@....net>,
	Jhristoph Lameter <cl@...ux.com>,
	Jekka Enberg <penberg@...nel.org>,
	Javid Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Jndrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	netdev@...r.kernel.org, linux-mm@...ck.org,
	Jeff Dike <jdike@...toit.com>,
	Richard Weinberger <richard@....at>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Mathieu Lacage <mathieu.lacage@...il.com>
Subject: [RFC PATCH 02/11] slab: add private memory allocator header for arch/lib

add header includion for CONFIG_LIB to wrap kmalloc and co. This will
bring malloc(3) based allocator used by arch/lib.

Signed-off-by: Hajime Tazaki <tazaki@....wide.ad.jp>
---
 include/linux/slab.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 9a139b6..6914e1f 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -205,6 +205,14 @@ size_t ksize(const void *);
 #endif
 #endif
 
+#ifdef CONFIG_LIB
+#define KMALLOC_SHIFT_MAX	30
+#define KMALLOC_SHIFT_HIGH	PAGE_SHIFT
+#ifndef KMALLOC_SHIFT_LOW
+#define KMALLOC_SHIFT_LOW	3
+#endif
+#endif
+
 /* Maximum allocatable size */
 #define KMALLOC_MAX_SIZE	(1UL << KMALLOC_SHIFT_MAX)
 /* Maximum size for which we actually use a slab cache */
@@ -350,6 +358,9 @@ kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order)
 }
 #endif
 
+#ifdef CONFIG_LIB
+#include <asm/slab.h>
+#else
 static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
 {
 	unsigned int order = get_order(size);
@@ -428,6 +439,7 @@ static __always_inline void *kmalloc(size_t size, gfp_t flags)
 	}
 	return __kmalloc(size, flags);
 }
+#endif
 
 /*
  * Determine size used for the nth kmalloc cache.
-- 
2.1.0

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