From: Thomas Gleixner Date: Fri, 15 Feb 2008 20:49:46 +0000 (+0100) Subject: x86: CPA no alias checking for _NX X-Git-Tag: v2.6.25-rc3~131^2~3 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=af96e4438a4b34a257f5318a296e0b9e182e7ab9;p=linux-2.6 x86: CPA no alias checking for _NX NX settings are not required to be consistent across alias mappings. 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 7b4a172369..b8f5323315 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -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: