linux-kernel - [PATCH 2/33] i386: define __pa

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Date:	Tue,  1 Aug 2006 05:03:17 -0600
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	<fastboot@...l.org>
Cc:	<linux-kernel@...r.kernel.org>, Horms <horms@...ge.net.au>,
	Jan Kratochvil <lace@...kratochvil.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Magnus Damm <magnus.damm@...il.com>,
	Vivek Goyal <vgoyal@...ibm.com>, Linda Wang <lwang@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 2/33] i386: define __pa_symbol

On x86_64 we have to be careful with calculating the physical
address of kernel symbols.  Both because of compiler odditities
and because the symbols live in a different range of the virtual
address space.

Having a defintition of __pa_symbol that works on both x86_64 and
i386 simplifies writing code that works for both x86_64 and
i386 that has these kinds of dependencies.

So this patch adds the trivial i386 __pa_symbol definition.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 include/asm-i386/page.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/asm-i386/page.h b/include/asm-i386/page.h
index f5bf544..eceb7f5 100644
--- a/include/asm-i386/page.h
+++ b/include/asm-i386/page.h
@@ -124,6 +124,7 @@ #define PAGE_OFFSET		((unsigned long)__P
 #define VMALLOC_RESERVE		((unsigned long)__VMALLOC_RESERVE)
 #define MAXMEM			(-__PAGE_OFFSET-__VMALLOC_RESERVE)
 #define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
+#define __pa_symbol(x)		__pa(x)
 #define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 #ifdef CONFIG_FLATMEM
-- 
1.4.2.rc2.g5209e

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