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x86: CPA no alias checking for _NX 

NX settings are not required to be consistent across alias mappings.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2008-02-15 21:49:46 +01:00
parent 31eedd823c
commit af96e4438a
1 changed files with 5 additions and 2 deletions
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7
arch/x86/mm/pageattr.c
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@ -669,7 +669,7 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages,
pgprot_t mask_set, pgprot_t mask_clr)
{
struct cpa_data cpa;
int ret, cache;
int ret, cache, checkalias;
/*
* Check, if we are requested to change a not supported
@ -695,7 +695,10 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages,
cpa.mask_clr = mask_clr;
cpa.flushtlb = 0;
ret = __change_page_attr_set_clr(&cpa, 1);
/* No alias checking for _NX bit modifications */
checkalias = (pgprot_val(mask_set) | pgprot_val(mask_clr)) != _PAGE_NX;
ret = __change_page_attr_set_clr(&cpa, checkalias);
/*
* Check whether we really changed something: