From: Benjamin Herrenschmidt Date: Sat, 16 Jun 2007 17:16:12 +0000 (-0700) Subject: Rework ptep_set_access_flags and fix sun4c X-Git-Tag: v2.6.22-rc5~5 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8dab5241d06bfc9ee141ea78c56cde5070d7460d;p=linux-2.6 Rework ptep_set_access_flags and fix sun4c Some changes done a while ago to avoid pounding on ptep_set_access_flags and update_mmu_cache in some race situations break sun4c which requires update_mmu_cache() to always be called on minor faults. This patch reworks ptep_set_access_flags() semantics, implementations and callers so that it's now responsible for returning whether an update is necessary or not (basically whether the PTE actually changed). This allow fixing the sparc implementation to always return 1 on sun4c. [akpm@linux-foundation.org: fixes, cleanups] Signed-off-by: Benjamin Herrenschmidt Cc: Hugh Dickins Cc: David Miller Cc: Mark Fortescue Acked-by: William Lee Irwin III Cc: "Luck, Tony" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index dc8f99ee30..7d7bcf990e 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -27,13 +27,20 @@ do { \ * Largely same as above, but only sets the access flags (dirty, * accessed, and writable). Furthermore, we know it always gets set * to a "more permissive" setting, which allows most architectures - * to optimize this. + * to optimize this. We return whether the PTE actually changed, which + * in turn instructs the caller to do things like update__mmu_cache. + * This used to be done in the caller, but sparc needs minor faults to + * force that call on sun4c so we changed this macro slightly */ #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ -do { \ - set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \ - flush_tlb_page(__vma, __address); \ -} while (0) +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed) { \ + set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \ + flush_tlb_page(__vma, __address); \ + } \ + __changed; \ +}) #endif #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h index d62bdb029e..628fa7747d 100644 --- a/include/asm-i386/pgtable.h +++ b/include/asm-i386/pgtable.h @@ -285,13 +285,15 @@ static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) */ #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS #define ptep_set_access_flags(vma, address, ptep, entry, dirty) \ -do { \ - if (dirty) { \ +({ \ + int __changed = !pte_same(*(ptep), entry); \ + if (__changed && dirty) { \ (ptep)->pte_low = (entry).pte_low; \ pte_update_defer((vma)->vm_mm, (address), (ptep)); \ flush_tlb_page(vma, address); \ } \ -} while (0) + __changed; \ +}) #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY #define ptep_test_and_clear_dirty(vma, addr, ptep) ({ \ diff --git a/include/asm-ia64/pgtable.h b/include/asm-ia64/pgtable.h index 670b706411..6580f31b31 100644 --- a/include/asm-ia64/pgtable.h +++ b/include/asm-ia64/pgtable.h @@ -533,16 +533,23 @@ extern void lazy_mmu_prot_update (pte_t pte); * daccess_bit in ivt.S). */ #ifdef CONFIG_SMP -# define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \ -do { \ - if (__safely_writable) { \ - set_pte(__ptep, __entry); \ - flush_tlb_page(__vma, __addr); \ - } \ -} while (0) +# define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \ +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed && __safely_writable) { \ + set_pte(__ptep, __entry); \ + flush_tlb_page(__vma, __addr); \ + } \ + __changed; \ +}) #else -# define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \ - ptep_establish(__vma, __addr, __ptep, __entry) +# define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \ +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed) \ + ptep_establish(__vma, __addr, __ptep, __entry); \ + __changed; \ +}) #endif # ifdef CONFIG_VIRTUAL_MEM_MAP diff --git a/include/asm-powerpc/pgtable-ppc32.h b/include/asm-powerpc/pgtable-ppc32.h index c863bdb288..7fb730c62f 100644 --- a/include/asm-powerpc/pgtable-ppc32.h +++ b/include/asm-powerpc/pgtable-ppc32.h @@ -673,10 +673,14 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry, int dirty) } #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ - do { \ - __ptep_set_access_flags(__ptep, __entry, __dirty); \ - flush_tlb_page_nohash(__vma, __address); \ - } while(0) +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed) { \ + __ptep_set_access_flags(__ptep, __entry, __dirty); \ + flush_tlb_page_nohash(__vma, __address); \ + } \ + __changed; \ +}) /* * Macro to mark a page protection value as "uncacheable". diff --git a/include/asm-powerpc/pgtable-ppc64.h b/include/asm-powerpc/pgtable-ppc64.h index 704c4e669f..3cfd98f44b 100644 --- a/include/asm-powerpc/pgtable-ppc64.h +++ b/include/asm-powerpc/pgtable-ppc64.h @@ -413,10 +413,14 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry, int dirty) :"cc"); } #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ - do { \ - __ptep_set_access_flags(__ptep, __entry, __dirty); \ - flush_tlb_page_nohash(__vma, __address); \ - } while(0) +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed) { \ + __ptep_set_access_flags(__ptep, __entry, __dirty); \ + flush_tlb_page_nohash(__vma, __address); \ + } \ + __changed; \ +}) /* * Macro to mark a page protection value as "uncacheable". diff --git a/include/asm-ppc/pgtable.h b/include/asm-ppc/pgtable.h index bed452d4a5..9d0ce9ff58 100644 --- a/include/asm-ppc/pgtable.h +++ b/include/asm-ppc/pgtable.h @@ -694,10 +694,14 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry, int dirty) } #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ - do { \ - __ptep_set_access_flags(__ptep, __entry, __dirty); \ - flush_tlb_page_nohash(__vma, __address); \ - } while(0) +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed) { \ + __ptep_set_access_flags(__ptep, __entry, __dirty); \ + flush_tlb_page_nohash(__vma, __address); \ + } \ + __changed; \ +}) /* * Macro to mark a page protection value as "uncacheable". diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h index 8fe8d42e64..0a307bb2f3 100644 --- a/include/asm-s390/pgtable.h +++ b/include/asm-s390/pgtable.h @@ -744,7 +744,12 @@ ptep_establish(struct vm_area_struct *vma, } #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ - ptep_establish(__vma, __address, __ptep, __entry) +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed) \ + ptep_establish(__vma, __address, __ptep, __entry); \ + __changed; \ +}) /* * Test and clear dirty bit in storage key. diff --git a/include/asm-sparc/pgtable.h b/include/asm-sparc/pgtable.h index 4f0a5ba0d6..59229aeba2 100644 --- a/include/asm-sparc/pgtable.h +++ b/include/asm-sparc/pgtable.h @@ -446,6 +446,17 @@ extern int io_remap_pfn_range(struct vm_area_struct *vma, #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4)) #define GET_PFN(pfn) (pfn & 0x0fffffffUL) +#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS +#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed) { \ + set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \ + flush_tlb_page(__vma, __address); \ + } \ + (sparc_cpu_model == sun4c) || __changed; \ +}) + #include #endif /* !(__ASSEMBLY__) */ diff --git a/include/asm-x86_64/pgtable.h b/include/asm-x86_64/pgtable.h index 08b9831f2e..0a71e0b9a6 100644 --- a/include/asm-x86_64/pgtable.h +++ b/include/asm-x86_64/pgtable.h @@ -395,12 +395,14 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) * bit at the same time. */ #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ - do { \ - if (__dirty) { \ - set_pte(__ptep, __entry); \ - flush_tlb_page(__vma, __address); \ - } \ - } while (0) +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed && __dirty) { \ + set_pte(__ptep, __entry); \ + flush_tlb_page(__vma, __address); \ + } \ + __changed; \ +}) /* Encode and de-code a swap entry */ #define __swp_type(x) (((x).val >> 1) & 0x3f) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index eb7180db30..a45d1f0691 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -326,9 +326,10 @@ static void set_huge_ptep_writable(struct vm_area_struct *vma, pte_t entry; entry = pte_mkwrite(pte_mkdirty(*ptep)); - ptep_set_access_flags(vma, address, ptep, entry, 1); - update_mmu_cache(vma, address, entry); - lazy_mmu_prot_update(entry); + if (ptep_set_access_flags(vma, address, ptep, entry, 1)) { + update_mmu_cache(vma, address, entry); + lazy_mmu_prot_update(entry); + } } diff --git a/mm/memory.c b/mm/memory.c index cb94488ab9..f64cbf9baa 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1691,9 +1691,10 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma, flush_cache_page(vma, address, pte_pfn(orig_pte)); entry = pte_mkyoung(orig_pte); entry = maybe_mkwrite(pte_mkdirty(entry), vma); - ptep_set_access_flags(vma, address, page_table, entry, 1); - update_mmu_cache(vma, address, entry); - lazy_mmu_prot_update(entry); + if (ptep_set_access_flags(vma, address, page_table, entry,1)) { + update_mmu_cache(vma, address, entry); + lazy_mmu_prot_update(entry); + } ret |= VM_FAULT_WRITE; goto unlock; } @@ -2525,10 +2526,9 @@ static inline int handle_pte_fault(struct mm_struct *mm, pte_t *pte, pmd_t *pmd, int write_access) { pte_t entry; - pte_t old_entry; spinlock_t *ptl; - old_entry = entry = *pte; + entry = *pte; if (!pte_present(entry)) { if (pte_none(entry)) { if (vma->vm_ops) { @@ -2561,8 +2561,7 @@ static inline int handle_pte_fault(struct mm_struct *mm, entry = pte_mkdirty(entry); } entry = pte_mkyoung(entry); - if (!pte_same(old_entry, entry)) { - ptep_set_access_flags(vma, address, pte, entry, write_access); + if (ptep_set_access_flags(vma, address, pte, entry, write_access)) { update_mmu_cache(vma, address, entry); lazy_mmu_prot_update(entry); } else {