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[PATCH] x86-64: x86_64 add NX mask for PTE entry 

If function change_page_attr_addr calls revert_page to revert
to original pte value, mk_pte_phys does not mask NX bit. If NX bit
is set on no NX hardware supported x86_64 machine, there is will
be RSVD type page fault and system will crash. This patch adds NX
mask bit for PTE entry.

Signed-off-by: bibo,mao <bibo.mao@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
hifive-unleashed-5.1
bibo,mao 2006-10-21 18:37:02 +02:00 committed by Andi Kleen
parent 690a973f48
commit 7a71cef780
1 changed files with 1 additions and 0 deletions
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include/asm-x86_64/pgtable.h
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@ -366,6 +366,7 @@ static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
{
pte_t pte;
pte_val(pte) = physpage | pgprot_val(pgprot);
pte_val(pte) &= __supported_pte_mask;
return pte;
}