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[MIPS] Fix mprotect() syscall for MIPS32 w/36-bit physical address support 

Fix mprotect() syscall for MIPS32 CPUs with 36-bit physical address
support: pte_modify() macro didn't clear the hardware page protection bits
before modifying...
    
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Sergei Shtylyov 2006-05-03 22:56:43 +04:00 committed by Ralf Baechle
parent 9370b35175
commit 79e0bc3725
1 changed files with 3 additions and 2 deletions
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5
include/asm-mips/pgtable.h
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@ -353,8 +353,9 @@ static inline pgprot_t pgprot_noncached(pgprot_t _prot)
#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
pte.pte_low &= _PAGE_CHG_MASK;
pte.pte_low |= pgprot_val(newprot);
pte.pte_low &= _PAGE_CHG_MASK;
pte.pte_high &= ~0x3f;
pte.pte_low |= pgprot_val(newprot);
pte.pte_high |= pgprot_val(newprot) & 0x3f;
return pte;
}