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| author |   Vitaly Andrianov <vitalya@ti.com> | 2012-05-15 15:01:16 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@arm.linux.org.uk> | 2012-05-17 14:48:56 +0100 |
| commit | 1a3abcf41f13666d4ed241c8cc7f48bd38e7b543 (patch) | |
| tree | 4d1cb4bc3b0e65149a1ab2d1ad4a51a4bdd2035c /arch/arm/mm | |
| parent | ARM: prevent VM_GROWSDOWN mmaps extending below FIRST_USER_ADDRESS (diff) | |
| download | linux-dev-1a3abcf41f13666d4ed241c8cc7f48bd38e7b543.tar.xz linux-dev-1a3abcf41f13666d4ed241c8cc7f48bd38e7b543.zip | |
ARM: 7418/1: LPAE: fix access flag setup in mem_type_table
A zero value for prot_sect in the memory types table implies that
section mappings should never be created for the memory type in question.
This is checked for in alloc_init_section().
With LPAE, we set a bit to mask access flag faults for kernel mappings.
This breaks the aforementioned (!prot_sect) check in alloc_init_section().
This patch fixes this bug by first checking for a non-zero
prot_sect before setting the PMD_SECT_AF flag.
Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm')
| -rw-r--r-- | arch/arm/mm/mmu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 2c7cf2f9c837..aa78de8bfdd3 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -489,7 +489,8 @@ static void __init build_mem_type_table(void) */ for (i = 0; i < ARRAY_SIZE(mem_types); i++) { mem_types[i].prot_pte |= PTE_EXT_AF; - mem_types[i].prot_sect |= PMD_SECT_AF; + if (mem_types[i].prot_sect) + mem_types[i].prot_sect |= PMD_SECT_AF; } kern_pgprot |= PTE_EXT_AF; vecs_pgprot |= PTE_EXT_AF; |