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| author | Thomas Gleixner <tglx@linutronix.de> | 2008-02-15 21:49:46 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-02-18 20:54:14 +0100 |
| commit | af96e4438a4b34a257f5318a296e0b9e182e7ab9 (patch) | |
| tree | 95f07ce45975863025694ec3e51dd04f3aacd5a4 /arch/x86/mm/pageattr.c | |
| parent | 31eedd823c1bf3650c450346a0d0c39431034eb9 (diff) | |
| download | lwn-af96e4438a4b34a257f5318a296e0b9e182e7ab9.tar.gz lwn-af96e4438a4b34a257f5318a296e0b9e182e7ab9.zip | |
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>
Diffstat (limited to 'arch/x86/mm/pageattr.c')
| -rw-r--r-- | arch/x86/mm/pageattr.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 7b4a17236972..b8f53233151d 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: |