Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932345Ab0KLSBI (ORCPT ); Fri, 12 Nov 2010 13:01:08 -0500 Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]:50894 "EHLO cam-admin0.cambridge.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756446Ab0KLSBC (ORCPT ); Fri, 12 Nov 2010 13:01:02 -0500 From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 04/20] ARM: LPAE: Do not assume Linux PTEs are always at PTRS_PER_PTE offset Date: Fri, 12 Nov 2010 18:00:24 +0000 Message-Id: <1289584840-18097-5-git-send-email-catalin.marinas@arm.com> X-Mailer: git-send-email 1.7.3.2.164.g6f10c In-Reply-To: <1289584840-18097-1-git-send-email-catalin.marinas@arm.com> References: <1289584840-18097-1-git-send-email-catalin.marinas@arm.com> X-OriginalArrivalTime: 12 Nov 2010 18:00:49.0391 (UTC) FILETIME=[89CD07F0:01CB8293] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4352 Lines: 114 Placing the Linux PTEs at a 2KB offset inside a page is a workaround for the 2-level page table format where not enough spare bits are available. With LPAE this is no longer required. This patch changes such assumption by using a different macro, LINUX_PTE_OFFSET, which is defined to PTRS_PER_PTE for the 2-level page tables. Signed-off-by: Catalin Marinas --- arch/arm/include/asm/pgalloc.h | 6 +++--- arch/arm/include/asm/pgtable-2level.h | 1 + arch/arm/include/asm/pgtable.h | 6 +++--- arch/arm/mm/fault.c | 2 +- arch/arm/mm/mmu.c | 3 ++- 5 files changed, 10 insertions(+), 8 deletions(-) diff --git a/arch/arm/include/asm/pgalloc.h b/arch/arm/include/asm/pgalloc.h index b12cc98..c2a1f64 100644 --- a/arch/arm/include/asm/pgalloc.h +++ b/arch/arm/include/asm/pgalloc.h @@ -62,7 +62,7 @@ pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr) pte = (pte_t *)__get_free_page(PGALLOC_GFP); if (pte) { clean_dcache_area(pte, sizeof(pte_t) * PTRS_PER_PTE); - pte += PTRS_PER_PTE; + pte += LINUX_PTE_OFFSET; } return pte; @@ -95,7 +95,7 @@ pte_alloc_one(struct mm_struct *mm, unsigned long addr) static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) { if (pte) { - pte -= PTRS_PER_PTE; + pte -= LINUX_PTE_OFFSET; free_page((unsigned long)pte); } } @@ -128,7 +128,7 @@ pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep) * The pmd must be loaded with the physical * address of the PTE table */ - pte_ptr -= PTRS_PER_PTE * sizeof(void *); + pte_ptr -= LINUX_PTE_OFFSET * sizeof(void *); __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE); } diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h index d60bda9..36bdef7 100644 --- a/arch/arm/include/asm/pgtable-2level.h +++ b/arch/arm/include/asm/pgtable-2level.h @@ -71,6 +71,7 @@ #define PTRS_PER_PTE 512 #define PTRS_PER_PMD 1 #define PTRS_PER_PGD 2048 +#define LINUX_PTE_OFFSET PTRS_PER_PTE /* * PMD_SHIFT determines the size of the area a second-level page table can map diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 17e7ba6..ea08ab7 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -135,8 +135,8 @@ extern struct page *empty_zero_page; #define __pte_map(dir) pmd_page_vaddr(*(dir)) #define __pte_unmap(pte) do { } while (0) #else -#define __pte_map(dir) ((pte_t *)kmap_atomic(pmd_page(*(dir))) + PTRS_PER_PTE) -#define __pte_unmap(pte) kunmap_atomic((pte - PTRS_PER_PTE)) +#define __pte_map(dir) ((pte_t *)kmap_atomic(pmd_page(*(dir))) + LINUX_PTE_OFFSET) +#define __pte_unmap(pte) kunmap_atomic((pte - LINUX_PTE_OFFSET)) #endif #define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,pte,ext) @@ -232,7 +232,7 @@ static inline pte_t *pmd_page_vaddr(pmd_t pmd) unsigned long ptr; ptr = pmd_val(pmd) & ~(PTRS_PER_PTE * sizeof(void *) - 1); - ptr += PTRS_PER_PTE * sizeof(void *); + ptr += LINUX_PTE_OFFSET * sizeof(void *); return __va(ptr); } diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index 1e21e12..5da7b0c 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -108,7 +108,7 @@ void show_pte(struct mm_struct *mm, unsigned long addr) pte = pte_offset_map(pmd, addr); printk(", *pte=%08lx", pte_val(*pte)); - printk(", *ppte=%08lx", pte_val(pte[-PTRS_PER_PTE])); + printk(", *ppte=%08lx", pte_val(pte[-LINUX_PTE_OFFSET])); pte_unmap(pte); } while(0); diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 5e3adca..7324fbc 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -535,7 +535,8 @@ static void __init *early_alloc(unsigned long sz) static pte_t * __init early_pte_alloc(pmd_t *pmd, unsigned long addr, unsigned long prot) { if (pmd_none(*pmd)) { - pte_t *pte = early_alloc(2 * PTRS_PER_PTE * sizeof(pte_t)); + pte_t *pte = early_alloc((LINUX_PTE_OFFSET + + PTRS_PER_PTE) * sizeof(pte_t)); __pmd_populate(pmd, __pa(pte) | prot); } BUG_ON(pmd_bad(*pmd)); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/