diff options
| -rw-r--r-- | arch/i386/kernel/smpboot.c | 4 | ||||
| -rw-r--r-- | arch/i386/mm/pgtable.c | 10 | ||||
| -rw-r--r-- | include/asm-i386/pgtable.h | 15 |
3 files changed, 22 insertions, 7 deletions
diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c index 8ac8e9fd561..8e950cdff1a 100644 --- a/arch/i386/kernel/smpboot.c +++ b/arch/i386/kernel/smpboot.c @@ -1017,8 +1017,8 @@ int __devinit smp_prepare_cpu(int cpu) tsc_sync_disabled = 1; /* init low mem mapping */ - memcpy(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS, - sizeof(swapper_pg_dir[0]) * KERNEL_PGD_PTRS); + clone_pgd_range(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS, + KERNEL_PGD_PTRS); flush_tlb_all(); schedule_work(&task); wait_for_completion(&done); diff --git a/arch/i386/mm/pgtable.c b/arch/i386/mm/pgtable.c index bd2f7afc7a2..dcdce2c6c53 100644 --- a/arch/i386/mm/pgtable.c +++ b/arch/i386/mm/pgtable.c @@ -207,19 +207,19 @@ void pgd_ctor(void *pgd, kmem_cache_t *cache, unsigned long unused) { unsigned long flags; - if (PTRS_PER_PMD == 1) + if (PTRS_PER_PMD == 1) { + memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t)); spin_lock_irqsave(&pgd_lock, flags); + } - memcpy((pgd_t *)pgd + USER_PTRS_PER_PGD, + clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD, - (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); - + KERNEL_PGD_PTRS); if (PTRS_PER_PMD > 1) return; pgd_list_add(pgd); spin_unlock_irqrestore(&pgd_lock, flags); - memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t)); } /* never called when PTRS_PER_PMD > 1 */ diff --git a/include/asm-i386/pgtable.h b/include/asm-i386/pgtable.h index d74185aee15..47bc1ffa3d4 100644 --- a/include/asm-i386/pgtable.h +++ b/include/asm-i386/pgtable.h @@ -278,6 +278,21 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, } /* + * clone_pgd_range(pgd_t *dst, pgd_t *src, int count); + * + * dst - pointer to pgd range anwhere on a pgd page + * src - "" + * count - the number of pgds to copy. + * + * dst and src can be on the same page, but the range must not overlap, + * and must not cross a page boundary. + */ +static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count) +{ + memcpy(dst, src, count * sizeof(pgd_t)); +} + +/* * Macro to mark a page protection value as "uncacheable". On processors which do not support * it, this is a no-op. */ |