diff options
| author | LEROY Christophe <christophe.leroy@c-s.fr> | 2015-01-19 19:04:38 +0300 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2015-01-30 05:11:51 +0300 |
| commit | a7b9f671f2d141528491c346e21e8a179cee9d21 (patch) | |
| tree | 963edf92d3bc966992c78c4fa94d368003f9b396 /arch/powerpc/include/asm/pgtable-ppc32.h | |
| parent | d2caa3cebda8b626336e100b80a0ed6f909dccab (diff) | |
| download | linux-a7b9f671f2d141528491c346e21e8a179cee9d21.tar.xz | |
powerpc32: adds handling of _PAGE_RO
Some powerpc like the 8xx don't have a RW bit in PTE bits but a RO
(Read Only) bit. This patch implements the handling of a _PAGE_RO flag
to be used in place of _PAGE_RW
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[scottwood@freescale.com: fix whitespace]
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc/include/asm/pgtable-ppc32.h')
| -rw-r--r-- | arch/powerpc/include/asm/pgtable-ppc32.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/pgtable-ppc32.h b/arch/powerpc/include/asm/pgtable-ppc32.h index 234e07c47803..62a3e49a9a14 100644 --- a/arch/powerpc/include/asm/pgtable-ppc32.h +++ b/arch/powerpc/include/asm/pgtable-ppc32.h @@ -275,7 +275,7 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { - pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), 0); + pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), _PAGE_RO); } static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) @@ -286,9 +286,11 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry) { - unsigned long bits = pte_val(entry) & + unsigned long set = pte_val(entry) & (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC); - pte_update(ptep, 0, bits); + unsigned long clr = ~pte_val(entry) & _PAGE_RO; + + pte_update(ptep, clr, set); } #define __HAVE_ARCH_PTE_SAME |