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| author | Will Deacon <will.deacon@arm.com> | 2012-07-19 12:51:05 +0200 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2012-11-09 15:13:19 +0100 |
| commit | dbf62d50067e55a782583fe53c3d2a3d98b1f6f3 (patch) | |
| tree | 1bca43e9824e79d97bc32445182fe91a6600e035 /arch/arm/include/asm/pgtable.h | |
| parent | ARM: mm: don't use the access flag permissions mechanism for classic MMU (diff) | |
| download | linux-dbf62d50067e55a782583fe53c3d2a3d98b1f6f3.tar.xz linux-dbf62d50067e55a782583fe53c3d2a3d98b1f6f3.zip | |
ARM: mm: introduce L_PTE_VALID for page table entries
For long-descriptor translation table formats, the ARMv7 architecture
defines the last two bits of the second- and third-level descriptors to
be:
x0b - Invalid
01b - Block (second-level), Reserved (third-level)
11b - Table (second-level), Page (third-level)
This allows us to define L_PTE_PRESENT as (3 << 0) and use this value to
create ptes directly. However, when determining whether a given pte
value is present in the low-level page table accessors, we only need to
check the least significant bit of the descriptor, allowing us to write
faulting, present entries which are required for PROT_NONE mappings.
This patch introduces L_PTE_VALID, which can be used to test whether a
pte should fault, and updates the low-level page table accessors
accordingly.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm/include/asm/pgtable.h')
| -rw-r--r-- | arch/arm/include/asm/pgtable.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 08c12312a1f9..ccf34b6e9903 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -203,9 +203,7 @@ static inline pte_t *pmd_page_vaddr(pmd_t pmd) #define pte_exec(pte) (!(pte_val(pte) & L_PTE_XN)) #define pte_special(pte) (0) -#define pte_present_user(pte) \ - ((pte_val(pte) & (L_PTE_PRESENT | L_PTE_USER)) == \ - (L_PTE_PRESENT | L_PTE_USER)) +#define pte_present_user(pte) (pte_present(pte) && (pte_val(pte) & L_PTE_USER)) #if __LINUX_ARM_ARCH__ < 6 static inline void __sync_icache_dcache(pte_t pteval) |