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| author | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:33:43 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:33:43 +0100 |
| commit | f0646e43acb18f0e00b00085dc88bc3f403e7930 (patch) | |
| tree | c47968a44ac541854929f03d22cf2fb76d76cb55 /arch/x86/mm/pageattr_32.c | |
| parent | a5a5dc31794c3271c066835ad2c90c58a3805569 (diff) | |
| download | lwn-f0646e43acb18f0e00b00085dc88bc3f403e7930.tar.gz lwn-f0646e43acb18f0e00b00085dc88bc3f403e7930.zip | |
x86: return the page table level in lookup_address()
based on this patch from Andi Kleen:
| Subject: CPA: Return the page table level in lookup_address()
| From: Andi Kleen <ak@suse.de>
|
| Needed for the next change.
|
| And change all the callers.
and ported it to x86.git.
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/mm/pageattr_32.c')
| -rw-r--r-- | arch/x86/mm/pageattr_32.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/mm/pageattr_32.c b/arch/x86/mm/pageattr_32.c index be4656403d77..523fd5b37df9 100644 --- a/arch/x86/mm/pageattr_32.c +++ b/arch/x86/mm/pageattr_32.c @@ -18,7 +18,7 @@ static DEFINE_SPINLOCK(cpa_lock); static struct list_head df_list = LIST_HEAD_INIT(df_list); -pte_t *lookup_address(unsigned long address) +pte_t *lookup_address(unsigned long address, int *level) { pgd_t *pgd = pgd_offset_k(address); pud_t *pud; @@ -32,8 +32,10 @@ pte_t *lookup_address(unsigned long address) pmd = pmd_offset(pud, address); if (pmd_none(*pmd)) return NULL; + *level = 2; if (pmd_large(*pmd)) return (pte_t *)pmd; + *level = 3; return pte_offset_kernel(pmd, address); } @@ -156,11 +158,12 @@ static int __change_page_attr(struct page *page, pgprot_t prot) struct page *kpte_page; unsigned long address; pte_t *kpte; + int level; BUG_ON(PageHighMem(page)); address = (unsigned long)page_address(page); - kpte = lookup_address(address); + kpte = lookup_address(address, &level); if (!kpte) return -EINVAL; |