The patch titled
i386: define __pa_symbol()
has been added to the -mm tree. Its filename is
i386-define-__pa_symbol.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: i386: define __pa_symbol()
From: Vivek Goyal <vgoyal@xxxxxxxxxx>
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@xxxxxxxxxxxx>
Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/asm-i386/page.h | 6 ++++++
1 files changed, 6 insertions(+)
diff -puN include/asm-i386/page.h~i386-define-__pa_symbol include/asm-i386/page.h
--- a/include/asm-i386/page.h~i386-define-__pa_symbol
+++ a/include/asm-i386/page.h
@@ -124,6 +124,12 @@ extern int page_is_ram(unsigned long pag
#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) \
+ ({unsigned long v; \
+ asm("" : "=r" (v) : "0" (x)); \
+ __pa(v); })
#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
#ifdef CONFIG_FLATMEM
_
Patches currently in -mm which might be from vgoyal@xxxxxxxxxx are
origin.patch
i386-distinguish-absolute-symbols.patch
i386-align-data-section-to-4k-boundary.patch
i386-force-section-size-to-be-non-zero-to-prevent-a-symbol-becoming-absolute.patch
i386-define-__pa_symbol.patch
i386-setupc-reserve-kernel-memory-starting-from-_text.patch
i386-config_physical_start-cleanup.patch
make-linux-elfh-safe-to-be-included-in-assembly-files.patch
elf-add-elfosabi_standalone-to-elfh.patch
kallsyms-generate-relocatable-symbols.patch
i386-relocatable-kernel-support.patch
i386-implement-config_physical_align.patch
i386-boot-add-an-elf-header-to-bzimage.patch
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