From ddbf7e1c1143337cad2fbe68fbea7ba76e6720a4 Mon Sep 17 00:00:00 2001 From: Russell King Date: Thu, 28 Nov 2013 21:43:40 +0000 Subject: [PATCH] ARM: fix booting low-vectors machines commit d8aa712c30148ba26fd89a5dc14de95d4c375184 upstream. Commit f6f91b0d9fd9 (ARM: allow kuser helpers to be removed from the vector page) required two pages for the vectors code. Although the code setting up the initial page tables was updated, the code which allocates page tables for new processes wasn't, neither was the code which tears down the mappings. Fix this. Fixes: f6f91b0d9fd9 ("ARM: allow kuser helpers to be removed from the vector page") Signed-off-by: Russell King Signed-off-by: Greg Kroah-Hartman --- arch/arm/include/asm/pgtable.h | 2 +- arch/arm/mm/mmap.c | 2 +- arch/arm/mm/pgd.c | 3 ++- 3 files changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index be956db..1571d12 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -61,7 +61,7 @@ extern void __pgd_error(const char *file, int line, pgd_t); * mapping to be mapped at. This is particularly important for * non-high vector CPUs. */ -#define FIRST_USER_ADDRESS PAGE_SIZE +#define FIRST_USER_ADDRESS (PAGE_SIZE * 2) /* * Use TASK_SIZE as the ceiling argument for free_pgtables() and diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c index 0c63562..304661d 100644 --- a/arch/arm/mm/mmap.c +++ b/arch/arm/mm/mmap.c @@ -146,7 +146,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, info.flags = VM_UNMAPPED_AREA_TOPDOWN; info.length = len; - info.low_limit = PAGE_SIZE; + info.low_limit = FIRST_USER_ADDRESS; info.high_limit = mm->mmap_base; info.align_mask = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; info.align_offset = pgoff << PAGE_SHIFT; diff --git a/arch/arm/mm/pgd.c b/arch/arm/mm/pgd.c index 0acb089..1046b37 100644 --- a/arch/arm/mm/pgd.c +++ b/arch/arm/mm/pgd.c @@ -87,7 +87,8 @@ pgd_t *pgd_alloc(struct mm_struct *mm) init_pud = pud_offset(init_pgd, 0); init_pmd = pmd_offset(init_pud, 0); init_pte = pte_offset_map(init_pmd, 0); - set_pte_ext(new_pte, *init_pte, 0); + set_pte_ext(new_pte + 0, init_pte[0], 0); + set_pte_ext(new_pte + 1, init_pte[1], 0); pte_unmap(init_pte); pte_unmap(new_pte); } -- 2.7.4