Re: [patch 6/6] x86: Add checks for virtual addresses in __phys_addr()

[Christoph Lameter]

We also need to address this issue with __pa expected to be a constant in 
32 bit code. Sigh.


---
 arch/x86/kernel/doublefault_32.c |    2 +-
 include/asm-x86/page_32.h        |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6/include/asm-x86/page_32.h
===================================================================
--- linux-2.6.orig/include/asm-x86/page_32.h	2008-05-09 19:32:47.000000000 -0700
+++ linux-2.6/include/asm-x86/page_32.h	2008-05-09 19:32:55.000000000 -0700
@@ -65,7 +65,7 @@ typedef struct page *pgtable_t;
 
 #ifndef __ASSEMBLY__
 #ifdef CONFIG_DEBUG_VM
-unsigned long __phys_addr(unsigned long x)
+extern unsigned long __phys_addr(unsigned long x);
 #else
 #define __phys_addr(x)	((x) - PAGE_OFFSET)
 #endif
Index: linux-2.6/arch/x86/kernel/doublefault_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/doublefault_32.c	2008-05-09 19:40:08.000000000 -0700
+++ linux-2.6/arch/x86/kernel/doublefault_32.c	2008-05-09 19:40:45.000000000 -0700
@@ -66,6 +66,6 @@ struct tss_struct doublefault_tss __cach
 		.ds		= __USER_DS,
 		.fs		= __KERNEL_PERCPU,
 
-		.__cr3		= __pa(swapper_pg_dir)
+		.__cr3		= (unsigned long)swapper_pg_dir - PAGE_OFFSET
 	}
 };

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