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authorThomas Gleixner <tglx@linutronix.de>2008-02-04 16:48:05 +0100
committerIngo Molnar <mingo@elte.hu>2008-02-04 16:48:05 +0100
commit63c1dcf4bc9a26b1d8baa9a8c7cc1b2e1e694011 (patch)
treecc318108d71dc0fdf42525a8e93722de6b0b140c /arch/x86
parent626c2c9d065da0cbd9997e112501487958fde690 (diff)
downloadop-kernel-dev-63c1dcf4bc9a26b1d8baa9a8c7cc1b2e1e694011.zip
op-kernel-dev-63c1dcf4bc9a26b1d8baa9a8c7cc1b2e1e694011.tar.gz
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 <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/mm/pageattr.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 6c55fbd..a629cea5e 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:
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