From: Thomas Gleixner Date: Mon, 4 Feb 2008 15:48:05 +0000 (+0100) Subject: x86: CPA use the existing pfn in split as well X-Git-Tag: v2.6.25-rc1~1057^2~31 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=63c1dcf4bc9a26b1d8baa9a8c7cc1b2e1e694011;p=linux-2.6 x86: CPA use the existing pfn in split as well When splitting large pages, we ge the pfn from the existing entry instead of calculating it ourself. This removes the last remaining range restriction of the cpa code. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 6c55fbdbd7..a629cea5e4 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -221,8 +221,7 @@ static int split_large_page(pte_t *kpte, unsigned long address) { pgprot_t ref_prot = pte_pgprot(pte_clrhuge(*kpte)); gfp_t gfp_flags = GFP_KERNEL; - unsigned long flags; - unsigned long addr; + unsigned long flags, addr, pfn; pte_t *pbase, *tmp; struct page *base; unsigned int i, level; @@ -253,8 +252,12 @@ static int split_large_page(pte_t *kpte, unsigned long address) paravirt_alloc_pt(&init_mm, page_to_pfn(base)); #endif - for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE) - set_pte(&pbase[i], pfn_pte(addr >> PAGE_SHIFT, ref_prot)); + /* + * Get the target pfn from the original entry: + */ + pfn = pte_pfn(*kpte); + for (i = 0; i < PTRS_PER_PTE; i++, pfn++) + set_pte(&pbase[i], pfn_pte(pfn, ref_prot)); /* * Install the new, split up pagetable. Important detail here: