提交 af96e443 编写于 作者: T Thomas Gleixner

x86: CPA no alias checking for _NX

NX settings are not required to be consistent across alias mappings.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
上级 31eedd82
...@@ -669,7 +669,7 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages, ...@@ -669,7 +669,7 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages,
pgprot_t mask_set, pgprot_t mask_clr) pgprot_t mask_set, pgprot_t mask_clr)
{ {
struct cpa_data cpa; struct cpa_data cpa;
int ret, cache; int ret, cache, checkalias;
/* /*
* Check, if we are requested to change a not supported * 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, ...@@ -695,7 +695,10 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages,
cpa.mask_clr = mask_clr; cpa.mask_clr = mask_clr;
cpa.flushtlb = 0; 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: * Check whether we really changed something:
......
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