linux-kernel - [PATCH 1/2] memblock: add error return when CONFIG_HAVE

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Date:	Wed, 30 Mar 2011 17:41:59 -0700
From:	Mike Travis <travis@....com>
To:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>
Cc:	David Rientjes <rientjes@...gle.com>,
	Jack Steiner <steiner@....com>, Robin Holt <holt@....com>,
	Len Brown <len.brown@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-acpi@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 1/2] memblock: add error return when CONFIG_HAVE_MEMBLOCK
 is not set

Subject: memblock: add error return when CONFIG_HAVE_MEMBLOCK is not set
Author: Yinghai Lu <yinghai@...nel.org>

	Add an error return if CONFIG_HAVE_MEMBLOCK is not set instead
	of having to add #ifdef CONFIG_HAVE_MEMBLOCK around blocks of
	code calling that function.

Signed-off-by: Mike Travis <travis@....com>
---
 include/linux/memblock.h |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- linux.orig/include/linux/memblock.h
+++ linux/include/linux/memblock.h
@@ -2,6 +2,8 @@
 #define _LINUX_MEMBLOCK_H
 #ifdef __KERNEL__
 
+#define MEMBLOCK_ERROR	0
+
 #ifdef CONFIG_HAVE_MEMBLOCK
 /*
  * Logical memory blocks.
@@ -20,7 +22,6 @@
 #include <asm/memblock.h>
 
 #define INIT_MEMBLOCK_REGIONS	128
-#define MEMBLOCK_ERROR		0
 
 struct memblock_region {
 	phys_addr_t base;
@@ -160,6 +161,12 @@ static inline unsigned long memblock_reg
 #define __initdata_memblock
 #endif
 
+#else
+static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
+{
+	return MEMBLOCK_ERROR;
+}
+
 #endif /* CONFIG_HAVE_MEMBLOCK */
 
 #endif /* __KERNEL__ */

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