From 087975b06b00af9bf888fab6f94ae113c5cd80bd Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Sat, 27 Jun 2009 15:35:15 +0900 Subject: [PATCH] x86: Clean up dump_pagetable() Use pgtable access helpers for 32-bit version dump_pagetable() and get rid of __typeof__() operators. This needs to make pmd_pfn() available for 2-level pgtable. Also, remove some casts for 64-bit version dump_pagetable(). Signed-off-by: Akinobu Mita LKML-Reference: <20090627063514.GA2834@localhost.localdomain> Signed-off-by: Ingo Molnar --- arch/x86/include/asm/pgtable.h | 10 +++---- arch/x86/mm/fault.c | 51 ++++++++++++++-------------------- 2 files changed, 26 insertions(+), 35 deletions(-) diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 3cc06e3fceb..af5481e9486 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -134,6 +134,11 @@ static inline unsigned long pte_pfn(pte_t pte) return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT; } +static inline unsigned long pmd_pfn(pmd_t pmd) +{ + return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT; +} + #define pte_page(pte) pfn_to_page(pte_pfn(pte)) static inline int pmd_large(pmd_t pte) @@ -422,11 +427,6 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); } -static inline unsigned long pmd_pfn(pmd_t pmd) -{ - return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT; -} - static inline int pud_large(pud_t pud) { return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) == diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 78a5fff857b..9bf7e52c286 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -285,26 +285,25 @@ check_v8086_mode(struct pt_regs *regs, unsigned long address, tsk->thread.screen_bitmap |= 1 << bit; } -static void dump_pagetable(unsigned long address) +static bool low_pfn(unsigned long pfn) { - __typeof__(pte_val(__pte(0))) page; + return pfn < max_low_pfn; +} - page = read_cr3(); - page = ((__typeof__(page) *) __va(page))[address >> PGDIR_SHIFT]; +static void dump_pagetable(unsigned long address) +{ + pgd_t *base = __va(read_cr3()); + pgd_t *pgd = &base[pgd_index(address)]; + pmd_t *pmd; + pte_t *pte; #ifdef CONFIG_X86_PAE - printk("*pdpt = %016Lx ", page); - if ((page >> PAGE_SHIFT) < max_low_pfn - && page & _PAGE_PRESENT) { - page &= PAGE_MASK; - page = ((__typeof__(page) *) __va(page))[(address >> PMD_SHIFT) - & (PTRS_PER_PMD - 1)]; - printk(KERN_CONT "*pde = %016Lx ", page); - page &= ~_PAGE_NX; - } -#else - printk("*pde = %08lx ", page); + printk("*pdpt = %016Lx ", pgd_val(*pgd)); + if (!low_pfn(pgd_val(*pgd) >> PAGE_SHIFT) || !pgd_present(*pgd)) + goto out; #endif + pmd = pmd_offset(pud_offset(pgd, address), address); + printk(KERN_CONT "*pde = %0*Lx ", sizeof(*pmd) * 2, (u64)pmd_val(*pmd)); /* * We must not directly access the pte in the highpte @@ -312,16 +311,12 @@ static void dump_pagetable(unsigned long address) * And let's rather not kmap-atomic the pte, just in case * it's allocated already: */ - if ((page >> PAGE_SHIFT) < max_low_pfn - && (page & _PAGE_PRESENT) - && !(page & _PAGE_PSE)) { - - page &= PAGE_MASK; - page = ((__typeof__(page) *) __va(page))[(address >> PAGE_SHIFT) - & (PTRS_PER_PTE - 1)]; - printk("*pte = %0*Lx ", sizeof(page)*2, (u64)page); - } + if (!low_pfn(pmd_pfn(*pmd)) || !pmd_present(*pmd) || pmd_large(*pmd)) + goto out; + pte = pte_offset_kernel(pmd, address); + printk("*pte = %0*Lx ", sizeof(*pte) * 2, (u64)pte_val(*pte)); +out: printk("\n"); } @@ -449,16 +444,12 @@ static int bad_address(void *p) static void dump_pagetable(unsigned long address) { - pgd_t *pgd; + pgd_t *base = __va(read_cr3() & PHYSICAL_PAGE_MASK); + pgd_t *pgd = base + pgd_index(address); pud_t *pud; pmd_t *pmd; pte_t *pte; - pgd = (pgd_t *)read_cr3(); - - pgd = __va((unsigned long)pgd & PHYSICAL_PAGE_MASK); - - pgd += pgd_index(address); if (bad_address(pgd)) goto bad; -- 2.39.3