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x86: CPA use the existing pfn in split as well

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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>
This commit is contained in:
Thomas Gleixner 2008-02-04 16:48:05 +01:00 committed by Ingo Molnar
parent 626c2c9d06
commit 63c1dcf4bc
1 changed files with 7 additions and 4 deletions
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11
arch/x86/mm/pageattr.c
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@ -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: