diff options
| author | Jeff Garzik <jgarzik@pobox.com> | 2005-10-30 01:58:18 -0500 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2005-10-30 01:58:18 -0500 |
| commit | f0612bbc41f65f5a684f69d714a1a17a6f0f40c5 (patch) | |
| tree | 8c070070bb355843cfa4635643e9da7c2c4cd44a /arch/sh/mm/fault.c | |
| parent | b0c4e148bd591629749d02a8fbc8d81c26d548cf (diff) | |
| parent | 81cfb8864c73230eb1c37753aba517db15cf4d8f (diff) | |
Merge branch 'upstream'
Diffstat (limited to 'arch/sh/mm/fault.c')
| -rw-r--r-- | arch/sh/mm/fault.c | 40 |
1 files changed, 23 insertions, 17 deletions
diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c index 7abba2161da..775f86cd3fe 100644 --- a/arch/sh/mm/fault.c +++ b/arch/sh/mm/fault.c @@ -194,10 +194,13 @@ asmlinkage int __do_page_fault(struct pt_regs *regs, unsigned long writeaccess, unsigned long address) { unsigned long addrmax = P4SEG; - pgd_t *dir; + pgd_t *pgd; pmd_t *pmd; pte_t *pte; pte_t entry; + struct mm_struct *mm; + spinlock_t *ptl; + int ret = 1; #ifdef CONFIG_SH_KGDB if (kgdb_nofault && kgdb_bus_err_hook) @@ -208,28 +211,28 @@ asmlinkage int __do_page_fault(struct pt_regs *regs, unsigned long writeaccess, addrmax = P4SEG_STORE_QUE + 0x04000000; #endif - if (address >= P3SEG && address < addrmax) - dir = pgd_offset_k(address); - else if (address >= TASK_SIZE) + if (address >= P3SEG && address < addrmax) { + pgd = pgd_offset_k(address); + mm = NULL; + } else if (address >= TASK_SIZE) return 1; - else if (!current->mm) + else if (!(mm = current->mm)) return 1; else - dir = pgd_offset(current->mm, address); + pgd = pgd_offset(mm, address); - pmd = pmd_offset(dir, address); - if (pmd_none(*pmd)) - return 1; - if (pmd_bad(*pmd)) { - pmd_ERROR(*pmd); - pmd_clear(pmd); + pmd = pmd_offset(pgd, address); + if (pmd_none_or_clear_bad(pmd)) return 1; - } - pte = pte_offset_kernel(pmd, address); + if (mm) + pte = pte_offset_map_lock(mm, pmd, address, &ptl); + else + pte = pte_offset_kernel(pmd, address); + entry = *pte; if (pte_none(entry) || pte_not_present(entry) || (writeaccess && !pte_write(entry))) - return 1; + goto unlock; if (writeaccess) entry = pte_mkdirty(entry); @@ -251,8 +254,11 @@ asmlinkage int __do_page_fault(struct pt_regs *regs, unsigned long writeaccess, set_pte(pte, entry); update_mmu_cache(NULL, address, entry); - - return 0; + ret = 0; +unlock: + if (mm) + pte_unmap_unlock(pte, ptl); + return ret; } void flush_tlb_page(struct vm_area_struct *vma, unsigned long page) |