From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Russell King Subject: [PATCH 3.10 10/52] ARM: fix booting low-vectors machines Date: Tue, 10 Dec 2013 00:00:43 -0800 Message-Id: <20131210075954.931609298@linuxfoundation.org> In-Reply-To: <20131210075954.196229872@linuxfoundation.org> References: <20131210075954.196229872@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Russell King 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(-) --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -58,7 +58,7 @@ extern void __pgd_error(const char *file * 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 --- a/arch/arm/mm/mmap.c +++ b/arch/arm/mm/mmap.c @@ -146,7 +146,7 @@ arch_get_unmapped_area_topdown(struct fi 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; --- 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); }