x86, mm: fault.c, reorder functions
Impact: cleanup Avoid a couple more #ifdefs by moving fundamentally non-unifiable functions into a single #ifdef 32-bit / #else / #endif block in fault.c: vmalloc*(), dump_pagetable(), check_vm8086_mode(). No code changed: text data bss dec hex filename 4618 32 24 4674 1242 fault.o.before 4618 32 24 4674 1242 fault.o.after Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
parent
b18018126f
commit
f2f13a8535
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@ -191,18 +191,124 @@ force_sig_info_fault(int si_signo, int si_code, unsigned long address,
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force_sig_info(si_signo, &info, tsk);
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force_sig_info(si_signo, &info, tsk);
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}
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}
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#ifdef CONFIG_X86_64
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DEFINE_SPINLOCK(pgd_lock);
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static int bad_address(void *p)
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LIST_HEAD(pgd_list);
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{
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unsigned long dummy;
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return probe_kernel_address((unsigned long *)p, dummy);
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#ifdef CONFIG_X86_32
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static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
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{
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unsigned index = pgd_index(address);
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pgd_t *pgd_k;
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pud_t *pud, *pud_k;
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pmd_t *pmd, *pmd_k;
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pgd += index;
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pgd_k = init_mm.pgd + index;
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if (!pgd_present(*pgd_k))
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return NULL;
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/*
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* set_pgd(pgd, *pgd_k); here would be useless on PAE
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* and redundant with the set_pmd() on non-PAE. As would
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* set_pud.
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*/
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pud = pud_offset(pgd, address);
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pud_k = pud_offset(pgd_k, address);
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if (!pud_present(*pud_k))
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return NULL;
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pmd = pmd_offset(pud, address);
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pmd_k = pmd_offset(pud_k, address);
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if (!pmd_present(*pmd_k))
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return NULL;
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if (!pmd_present(*pmd)) {
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set_pmd(pmd, *pmd_k);
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arch_flush_lazy_mmu_mode();
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} else {
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BUG_ON(pmd_page(*pmd) != pmd_page(*pmd_k));
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}
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return pmd_k;
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}
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void vmalloc_sync_all(void)
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{
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unsigned long address;
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if (SHARED_KERNEL_PMD)
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return;
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for (address = VMALLOC_START & PMD_MASK;
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address >= TASK_SIZE && address < FIXADDR_TOP;
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address += PMD_SIZE) {
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unsigned long flags;
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struct page *page;
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spin_lock_irqsave(&pgd_lock, flags);
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list_for_each_entry(page, &pgd_list, lru) {
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if (!vmalloc_sync_one(page_address(page), address))
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break;
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}
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spin_unlock_irqrestore(&pgd_lock, flags);
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}
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}
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/*
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* 32-bit:
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*
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* Handle a fault on the vmalloc or module mapping area
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*/
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static noinline int vmalloc_fault(unsigned long address)
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{
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unsigned long pgd_paddr;
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pmd_t *pmd_k;
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pte_t *pte_k;
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/* Make sure we are in vmalloc area: */
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if (!(address >= VMALLOC_START && address < VMALLOC_END))
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return -1;
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/*
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* Synchronize this task's top level page-table
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* with the 'reference' page table.
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*
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* Do _not_ use "current" here. We might be inside
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* an interrupt in the middle of a task switch..
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*/
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pgd_paddr = read_cr3();
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pmd_k = vmalloc_sync_one(__va(pgd_paddr), address);
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if (!pmd_k)
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return -1;
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pte_k = pte_offset_kernel(pmd_k, address);
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if (!pte_present(*pte_k))
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return -1;
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return 0;
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}
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/*
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* Did it hit the DOS screen memory VA from vm86 mode?
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*/
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static inline void
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check_v8086_mode(struct pt_regs *regs, unsigned long address,
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struct task_struct *tsk)
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{
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unsigned long bit;
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if (!v8086_mode(regs))
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return;
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bit = (address - 0xA0000) >> PAGE_SHIFT;
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if (bit < 32)
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tsk->thread.screen_bitmap |= 1 << bit;
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}
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}
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#endif
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static void dump_pagetable(unsigned long address)
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static void dump_pagetable(unsigned long address)
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{
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{
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#ifdef CONFIG_X86_32
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__typeof__(pte_val(__pte(0))) page;
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__typeof__(pte_val(__pte(0))) page;
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page = read_cr3();
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page = read_cr3();
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@ -239,7 +345,132 @@ static void dump_pagetable(unsigned long address)
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}
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}
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printk("\n");
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printk("\n");
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#else /* CONFIG_X86_64 */
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}
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#else /* CONFIG_X86_64: */
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void vmalloc_sync_all(void)
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{
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unsigned long address;
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for (address = VMALLOC_START & PGDIR_MASK; address <= VMALLOC_END;
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address += PGDIR_SIZE) {
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const pgd_t *pgd_ref = pgd_offset_k(address);
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unsigned long flags;
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struct page *page;
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if (pgd_none(*pgd_ref))
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continue;
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spin_lock_irqsave(&pgd_lock, flags);
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list_for_each_entry(page, &pgd_list, lru) {
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pgd_t *pgd;
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pgd = (pgd_t *)page_address(page) + pgd_index(address);
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if (pgd_none(*pgd))
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set_pgd(pgd, *pgd_ref);
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else
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BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
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}
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spin_unlock_irqrestore(&pgd_lock, flags);
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}
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}
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/*
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* 64-bit:
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*
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* Handle a fault on the vmalloc area
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*
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* This assumes no large pages in there.
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*/
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static noinline int vmalloc_fault(unsigned long address)
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{
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pgd_t *pgd, *pgd_ref;
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pud_t *pud, *pud_ref;
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pmd_t *pmd, *pmd_ref;
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pte_t *pte, *pte_ref;
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/* Make sure we are in vmalloc area: */
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if (!(address >= VMALLOC_START && address < VMALLOC_END))
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return -1;
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/*
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* Copy kernel mappings over when needed. This can also
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* happen within a race in page table update. In the later
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* case just flush:
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*/
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pgd = pgd_offset(current->active_mm, address);
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pgd_ref = pgd_offset_k(address);
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if (pgd_none(*pgd_ref))
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return -1;
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if (pgd_none(*pgd))
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set_pgd(pgd, *pgd_ref);
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else
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BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
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/*
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* Below here mismatches are bugs because these lower tables
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* are shared:
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*/
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pud = pud_offset(pgd, address);
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pud_ref = pud_offset(pgd_ref, address);
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if (pud_none(*pud_ref))
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return -1;
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if (pud_none(*pud) || pud_page_vaddr(*pud) != pud_page_vaddr(*pud_ref))
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BUG();
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pmd = pmd_offset(pud, address);
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pmd_ref = pmd_offset(pud_ref, address);
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if (pmd_none(*pmd_ref))
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return -1;
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if (pmd_none(*pmd) || pmd_page(*pmd) != pmd_page(*pmd_ref))
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BUG();
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pte_ref = pte_offset_kernel(pmd_ref, address);
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if (!pte_present(*pte_ref))
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return -1;
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pte = pte_offset_kernel(pmd, address);
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/*
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* Don't use pte_page here, because the mappings can point
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* outside mem_map, and the NUMA hash lookup cannot handle
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* that:
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*/
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if (!pte_present(*pte) || pte_pfn(*pte) != pte_pfn(*pte_ref))
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BUG();
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return 0;
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}
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static const char errata93_warning[] =
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KERN_ERR "******* Your BIOS seems to not contain a fix for K8 errata #93\n"
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KERN_ERR "******* Working around it, but it may cause SEGVs or burn power.\n"
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KERN_ERR "******* Please consider a BIOS update.\n"
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KERN_ERR "******* Disabling USB legacy in the BIOS may also help.\n";
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/*
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* No vm86 mode in 64-bit mode:
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*/
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static inline void
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check_v8086_mode(struct pt_regs *regs, unsigned long address,
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struct task_struct *tsk)
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{
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}
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static int bad_address(void *p)
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{
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unsigned long dummy;
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return probe_kernel_address((unsigned long *)p, dummy);
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}
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static void dump_pagetable(unsigned long address)
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{
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pgd_t *pgd;
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pgd_t *pgd;
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pud_t *pud;
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pud_t *pud;
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pmd_t *pmd;
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pmd_t *pmd;
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@ -284,83 +515,9 @@ out:
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return;
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return;
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bad:
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bad:
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printk("BAD\n");
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printk("BAD\n");
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#endif
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}
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}
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#ifdef CONFIG_X86_32
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#endif /* CONFIG_X86_64 */
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static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
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{
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unsigned index = pgd_index(address);
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pgd_t *pgd_k;
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pud_t *pud, *pud_k;
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pmd_t *pmd, *pmd_k;
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pgd += index;
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pgd_k = init_mm.pgd + index;
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if (!pgd_present(*pgd_k))
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return NULL;
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/*
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* set_pgd(pgd, *pgd_k); here would be useless on PAE
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* and redundant with the set_pmd() on non-PAE. As would
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* set_pud.
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*/
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pud = pud_offset(pgd, address);
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pud_k = pud_offset(pgd_k, address);
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if (!pud_present(*pud_k))
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return NULL;
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pmd = pmd_offset(pud, address);
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pmd_k = pmd_offset(pud_k, address);
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if (!pmd_present(*pmd_k))
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return NULL;
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if (!pmd_present(*pmd)) {
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set_pmd(pmd, *pmd_k);
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arch_flush_lazy_mmu_mode();
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} else {
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BUG_ON(pmd_page(*pmd) != pmd_page(*pmd_k));
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}
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return pmd_k;
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}
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/*
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* Did it hit the DOS screen memory VA from vm86 mode?
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*/
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static inline void
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check_v8086_mode(struct pt_regs *regs, unsigned long address,
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struct task_struct *tsk)
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{
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unsigned long bit;
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if (!v8086_mode(regs))
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return;
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bit = (address - 0xA0000) >> PAGE_SHIFT;
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if (bit < 32)
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tsk->thread.screen_bitmap |= 1 << bit;
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}
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#else /* CONFIG_X86_64: */
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static const char errata93_warning[] =
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KERN_ERR "******* Your BIOS seems to not contain a fix for K8 errata #93\n"
|
|
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KERN_ERR "******* Working around it, but it may cause SEGVs or burn power.\n"
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|
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KERN_ERR "******* Please consider a BIOS update.\n"
|
|
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KERN_ERR "******* Disabling USB legacy in the BIOS may also help.\n";
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/*
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* No vm86 mode in 64-bit mode:
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*/
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static inline void
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check_v8086_mode(struct pt_regs *regs, unsigned long address,
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struct task_struct *tsk)
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{
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}
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#endif
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/*
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/*
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* Workaround for K8 erratum #93 & buggy BIOS.
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* Workaround for K8 erratum #93 & buggy BIOS.
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@ -795,109 +952,6 @@ spurious_fault(unsigned long error_code, unsigned long address)
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return ret;
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return ret;
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}
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}
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/*
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* 32-bit:
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*
|
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* Handle a fault on the vmalloc or module mapping area
|
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*
|
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* 64-bit:
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*
|
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* Handle a fault on the vmalloc area
|
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*
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* This assumes no large pages in there.
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*/
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static noinline int vmalloc_fault(unsigned long address)
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{
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#ifdef CONFIG_X86_32
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unsigned long pgd_paddr;
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pmd_t *pmd_k;
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pte_t *pte_k;
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/* Make sure we are in vmalloc area: */
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if (!(address >= VMALLOC_START && address < VMALLOC_END))
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return -1;
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|
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||||||
/*
|
|
||||||
* Synchronize this task's top level page-table
|
|
||||||
* with the 'reference' page table.
|
|
||||||
*
|
|
||||||
* Do _not_ use "current" here. We might be inside
|
|
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* an interrupt in the middle of a task switch..
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*/
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pgd_paddr = read_cr3();
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pmd_k = vmalloc_sync_one(__va(pgd_paddr), address);
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if (!pmd_k)
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return -1;
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pte_k = pte_offset_kernel(pmd_k, address);
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if (!pte_present(*pte_k))
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return -1;
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return 0;
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#else
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pgd_t *pgd, *pgd_ref;
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|
||||||
pud_t *pud, *pud_ref;
|
|
||||||
pmd_t *pmd, *pmd_ref;
|
|
||||||
pte_t *pte, *pte_ref;
|
|
||||||
|
|
||||||
/* Make sure we are in vmalloc area: */
|
|
||||||
if (!(address >= VMALLOC_START && address < VMALLOC_END))
|
|
||||||
return -1;
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Copy kernel mappings over when needed. This can also
|
|
||||||
* happen within a race in page table update. In the later
|
|
||||||
* case just flush:
|
|
||||||
*/
|
|
||||||
pgd = pgd_offset(current->active_mm, address);
|
|
||||||
pgd_ref = pgd_offset_k(address);
|
|
||||||
if (pgd_none(*pgd_ref))
|
|
||||||
return -1;
|
|
||||||
|
|
||||||
if (pgd_none(*pgd))
|
|
||||||
set_pgd(pgd, *pgd_ref);
|
|
||||||
else
|
|
||||||
BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Below here mismatches are bugs because these lower tables
|
|
||||||
* are shared:
|
|
||||||
*/
|
|
||||||
|
|
||||||
pud = pud_offset(pgd, address);
|
|
||||||
pud_ref = pud_offset(pgd_ref, address);
|
|
||||||
if (pud_none(*pud_ref))
|
|
||||||
return -1;
|
|
||||||
|
|
||||||
if (pud_none(*pud) || pud_page_vaddr(*pud) != pud_page_vaddr(*pud_ref))
|
|
||||||
BUG();
|
|
||||||
|
|
||||||
pmd = pmd_offset(pud, address);
|
|
||||||
pmd_ref = pmd_offset(pud_ref, address);
|
|
||||||
if (pmd_none(*pmd_ref))
|
|
||||||
return -1;
|
|
||||||
|
|
||||||
if (pmd_none(*pmd) || pmd_page(*pmd) != pmd_page(*pmd_ref))
|
|
||||||
BUG();
|
|
||||||
|
|
||||||
pte_ref = pte_offset_kernel(pmd_ref, address);
|
|
||||||
if (!pte_present(*pte_ref))
|
|
||||||
return -1;
|
|
||||||
|
|
||||||
pte = pte_offset_kernel(pmd, address);
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Don't use pte_page here, because the mappings can point
|
|
||||||
* outside mem_map, and the NUMA hash lookup cannot handle
|
|
||||||
* that:
|
|
||||||
*/
|
|
||||||
if (!pte_present(*pte) || pte_pfn(*pte) != pte_pfn(*pte_ref))
|
|
||||||
BUG();
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
#endif
|
|
||||||
}
|
|
||||||
|
|
||||||
int show_unhandled_signals = 1;
|
int show_unhandled_signals = 1;
|
||||||
|
|
||||||
static inline int
|
static inline int
|
||||||
|
|
@ -1115,53 +1169,3 @@ good_area:
|
||||||
|
|
||||||
up_read(&mm->mmap_sem);
|
up_read(&mm->mmap_sem);
|
||||||
}
|
}
|
||||||
|
|
||||||
DEFINE_SPINLOCK(pgd_lock);
|
|
||||||
LIST_HEAD(pgd_list);
|
|
||||||
|
|
||||||
void vmalloc_sync_all(void)
|
|
||||||
{
|
|
||||||
unsigned long address;
|
|
||||||
|
|
||||||
#ifdef CONFIG_X86_32
|
|
||||||
if (SHARED_KERNEL_PMD)
|
|
||||||
return;
|
|
||||||
|
|
||||||
for (address = VMALLOC_START & PMD_MASK;
|
|
||||||
address >= TASK_SIZE && address < FIXADDR_TOP;
|
|
||||||
address += PMD_SIZE) {
|
|
||||||
|
|
||||||
unsigned long flags;
|
|
||||||
struct page *page;
|
|
||||||
|
|
||||||
spin_lock_irqsave(&pgd_lock, flags);
|
|
||||||
list_for_each_entry(page, &pgd_list, lru) {
|
|
||||||
if (!vmalloc_sync_one(page_address(page), address))
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
spin_unlock_irqrestore(&pgd_lock, flags);
|
|
||||||
}
|
|
||||||
#else /* CONFIG_X86_64 */
|
|
||||||
for (address = VMALLOC_START & PGDIR_MASK; address <= VMALLOC_END;
|
|
||||||
address += PGDIR_SIZE) {
|
|
||||||
|
|
||||||
const pgd_t *pgd_ref = pgd_offset_k(address);
|
|
||||||
unsigned long flags;
|
|
||||||
struct page *page;
|
|
||||||
|
|
||||||
if (pgd_none(*pgd_ref))
|
|
||||||
continue;
|
|
||||||
|
|
||||||
spin_lock_irqsave(&pgd_lock, flags);
|
|
||||||
list_for_each_entry(page, &pgd_list, lru) {
|
|
||||||
pgd_t *pgd;
|
|
||||||
pgd = (pgd_t *)page_address(page) + pgd_index(address);
|
|
||||||
if (pgd_none(*pgd))
|
|
||||||
set_pgd(pgd, *pgd_ref);
|
|
||||||
else
|
|
||||||
BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
|
|
||||||
}
|
|
||||||
spin_unlock_irqrestore(&pgd_lock, flags);
|
|
||||||
}
|
|
||||||
#endif
|
|
||||||
}
|
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue