Messages in this thread Patch in this message | | | Date | Tue, 12 Oct 2004 00:11:04 +0200 | From | Andrea Arcangeli <> | Subject | ptep_establish smp race x86 PAE >4G |
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This avoid userspace mm corruption during COWs with threads (i.e. malloc;fork;clone) on x86 PAE with >4G of ram
Signed-Off-By: Andrea Arcangeli <andrea@novell.com>
Index: linux-2.5/include/asm-i386/pgtable-3level.h =================================================================== RCS file: /home/andrea/crypto/cvs/linux-2.5/include/asm-i386/pgtable-3level.h,v retrieving revision 1.20 diff -u -p -r1.20 pgtable-3level.h --- linux-2.5/include/asm-i386/pgtable-3level.h 24 Aug 2004 18:28:07 -0000 1.20 +++ linux-2.5/include/asm-i386/pgtable-3level.h 11 Oct 2004 21:17:56 -0000 @@ -54,6 +54,7 @@ static inline void set_pte(pte_t *ptep, smp_wmb(); ptep->pte_low = pte.pte_low; } +#define __HAVE_ARCH_SET_PTE_ATOMIC #define set_pte_atomic(pteptr,pteval) \ set_64bit((unsigned long long *)(pteptr),pte_val(pteval)) #define set_pmd(pmdptr,pmdval) \ Index: linux-2.5/include/asm-generic/pgtable.h =================================================================== RCS file: /home/andrea/crypto/cvs/linux-2.5/include/asm-generic/pgtable.h,v retrieving revision 1.8 diff -u -p -r1.8 pgtable.h --- linux-2.5/include/asm-generic/pgtable.h 29 Jul 2004 06:01:30 -0000 1.8 +++ linux-2.5/include/asm-generic/pgtable.h 11 Oct 2004 22:07:31 -0000 @@ -13,11 +13,19 @@ * Note: the old pte is known to not be writable, so we don't need to * worry about dirty bits etc getting lost. */ +#ifndef __HAVE_ARCH_SET_PTE_ATOMIC #define ptep_establish(__vma, __address, __ptep, __entry) \ do { \ set_pte(__ptep, __entry); \ flush_tlb_page(__vma, __address); \ } while (0) +#else /* __HAVE_ARCH_SET_PTE_ATOMIC */ +#define ptep_establish(__vma, __address, __ptep, __entry) \ +do { \ + set_pte_atomic(__ptep, __entry); \ + flush_tlb_page(__vma, __address); \ +} while (0) +#endif /* __HAVE_ARCH_SET_PTE_ATOMIC */ #endif #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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