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| author | Eric W. Biederman <ebiederm@xmission.com> | 2006-12-07 02:14:03 +0100 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-12-07 02:14:03 +0100 |
| commit | 9f45accf17efc050ba26bf77cc4f166c950b284e (patch) | |
| tree | 1ea566184cfa02f4a1dd5e2643ad2d999f398f0f /include/asm-i386/page.h | |
| parent | [PATCH] i386: Add comment for align to vmlinux.lds (diff) | |
| download | linux-9f45accf17efc050ba26bf77cc4f166c950b284e.tar.xz linux-9f45accf17efc050ba26bf77cc4f166c950b284e.zip | |
[PATCH] 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.
Added assembly magic similar to RELOC_HIDE as suggested by Andi Kleen.
Just picked it up from x86_64.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to '')
| -rw-r--r-- | include/asm-i386/page.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-i386/page.h b/include/asm-i386/page.h index f5bf544c729a..5a70501291d6 100644 --- a/include/asm-i386/page.h +++ b/include/asm-i386/page.h @@ -124,6 +124,9 @@ extern int page_is_ram(unsigned long pagenr); #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE) #define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE) #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET) +/* __pa_symbol should be used for C visible symbols. + This seems to be the official gcc blessed way to do such arithmetic. */ +#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0)) #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET)) #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) #ifdef CONFIG_FLATMEM |