From: Vitaly Andrianov Date: Tue, 15 May 2012 14:01:16 +0000 (+0100) Subject: ARM: 7418/1: LPAE: fix access flag setup in mem_type_table X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1a3abcf41f13666d4ed241c8cc7f48bd38e7b543;p=linux-beck.git 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 Acked-by: Catalin Marinas Signed-off-by: Russell King --- 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;