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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 08:44:24 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 08:44:24 -0700
commite3ebadd95cb621e2c7436f3d3646447ac9d5c16d (patch)
tree510b41550cc3751cfb565e3e2ba195a68b784a03 /include/asm-x86_64
parent15700770ef7c5d12e2f1659d2ddbeb3f658d9f37 (diff)
Revert "[PATCH] x86: __pa and __pa_symbol address space separation"
This was broken. It adds complexity, for no good reason. Rather than separate __pa() and __pa_symbol(), we should deprecate __pa_symbol(), and preferably __pa() too - and just use "virt_to_phys()" instead, which is more readable and has nicer semantics. However, right now, just undo the separation, and make __pa_symbol() be the exact same as __pa(). That fixes the bugs this patch introduced, and we can do the fairly obvious cleanups later. Do the new __phys_addr() function (which is now the actual workhorse for the unified __pa()/__pa_symbol()) as a real external function, that way all the potential issues with compile/link-time optimizations of constant symbol addresses go away, and we can also, if we choose to, add more sanity-checking of the argument. Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@in.ibm.com> Cc: Andi Kleen <ak@suse.de> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r--include/asm-x86_64/page.h18
-rw-r--r--include/asm-x86_64/pgtable.h4
2 files changed, 9 insertions, 13 deletions
diff --git a/include/asm-x86_64/page.h b/include/asm-x86_64/page.h
index b17fc16ec2eb..4d04e2479569 100644
--- a/include/asm-x86_64/page.h
+++ b/include/asm-x86_64/page.h
@@ -94,26 +94,22 @@ extern unsigned long phys_base;
#define KERNEL_TEXT_SIZE (40*1024*1024)
#define KERNEL_TEXT_START 0xffffffff80000000
+#define PAGE_OFFSET __PAGE_OFFSET
#ifndef __ASSEMBLY__
#include <asm/bug.h>
-#endif /* __ASSEMBLY__ */
+extern unsigned long __phys_addr(unsigned long);
-#define PAGE_OFFSET __PAGE_OFFSET
+#endif /* __ASSEMBLY__ */
-/* Note: __pa(&symbol_visible_to_c) should be always replaced with __pa_symbol.
- Otherwise you risk miscompilation. */
-#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)); \
- ((v - __START_KERNEL_map) + phys_base); })
+#define __pa(x) __phys_addr((unsigned long)(x))
+#define __pa_symbol(x) __phys_addr((unsigned long)(x))
#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
+#define __boot_va(x) __va(x)
+#define __boot_pa(x) __pa(x)
#ifdef CONFIG_FLATMEM
#define pfn_valid(pfn) ((pfn) < end_pfn)
#endif
diff --git a/include/asm-x86_64/pgtable.h b/include/asm-x86_64/pgtable.h
index 599993f6ba84..da3390faaea6 100644
--- a/include/asm-x86_64/pgtable.h
+++ b/include/asm-x86_64/pgtable.h
@@ -19,7 +19,7 @@ extern pmd_t level2_kernel_pgt[512];
extern pgd_t init_level4_pgt[];
extern unsigned long __supported_pte_mask;
-#define swapper_pg_dir ((pgd_t *)NULL)
+#define swapper_pg_dir init_level4_pgt
extern void paging_init(void);
extern void clear_kernel_mapping(unsigned long addr, unsigned long size);
@@ -29,7 +29,7 @@ extern void clear_kernel_mapping(unsigned long addr, unsigned long size);
* for zero-mapped memory areas etc..
*/
extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
-#define ZERO_PAGE(vaddr) (pfn_to_page(__pa_symbol(&empty_zero_page) >> PAGE_SHIFT))
+#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
#endif /* !__ASSEMBLY__ */