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| author | Catalin Marinas <catalin.marinas@arm.com> | 2013-11-27 20:59:27 +0400 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2013-11-29 19:22:59 +0400 |
| commit | 3676f9ef5481d614f8c5c857f5319755be248268 (patch) | |
| tree | c125b42a392111d30c7c795b055063b23d806663 | |
| parent | 4f00130b70e5eee813cc7bc298e0f3fdf79673cc (diff) | |
| download | linux-3676f9ef5481d614f8c5c857f5319755be248268.tar.xz | |
arm64: Move PTE_PROT_NONE higher up
PTE_PROT_NONE means that a pte is present but does not have any
read/write attributes. However, setting the memory type like
pgprot_writecombine() is allowed and such bits overlap with
PTE_PROT_NONE. This causes mmap/munmap issues in drivers that change the
vma->vm_pg_prot on PROT_NONE mappings.
This patch reverts the PTE_FILE/PTE_PROT_NONE shift in commit
59911ca4325d (ARM64: mm: Move PTE_PROT_NONE bit) and moves PTE_PROT_NONE
together with the other software bits.
Signed-off-by: Steve Capper <steve.capper@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Steve Capper <steve.capper@linaro.org>
Cc: <stable@vger.kernel.org> # 3.11+
| -rw-r--r-- | arch/arm64/include/asm/pgtable.h | 31 |
1 files changed, 17 insertions, 14 deletions
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 5347b39fdb35..7f2b60affbb4 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -25,10 +25,11 @@ * Software defined PTE bits definition. */ #define PTE_VALID (_AT(pteval_t, 1) << 0) -#define PTE_PROT_NONE (_AT(pteval_t, 1) << 2) /* only when !PTE_VALID */ -#define PTE_FILE (_AT(pteval_t, 1) << 3) /* only when !pte_present() */ +#define PTE_FILE (_AT(pteval_t, 1) << 2) /* only when !pte_present() */ #define PTE_DIRTY (_AT(pteval_t, 1) << 55) #define PTE_SPECIAL (_AT(pteval_t, 1) << 56) + /* bit 57 for PMD_SECT_SPLITTING */ +#define PTE_PROT_NONE (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */ /* * VMALLOC and SPARSEMEM_VMEMMAP ranges. @@ -357,18 +358,20 @@ extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; /* * Encode and decode a swap entry: - * bits 0, 2: present (must both be zero) - * bit 3: PTE_FILE - * bits 4-8: swap type - * bits 9-63: swap offset + * bits 0-1: present (must be zero) + * bit 2: PTE_FILE + * bits 3-8: swap type + * bits 9-57: swap offset */ -#define __SWP_TYPE_SHIFT 4 +#define __SWP_TYPE_SHIFT 3 #define __SWP_TYPE_BITS 6 +#define __SWP_OFFSET_BITS 49 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) +#define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1) #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) -#define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) +#define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK) #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) @@ -382,15 +385,15 @@ extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; /* * Encode and decode a file entry: - * bits 0, 2: present (must both be zero) - * bit 3: PTE_FILE - * bits 4-63: file offset / PAGE_SIZE + * bits 0-1: present (must be zero) + * bit 2: PTE_FILE + * bits 3-57: file offset / PAGE_SIZE */ #define pte_file(pte) (pte_val(pte) & PTE_FILE) -#define pte_to_pgoff(x) (pte_val(x) >> 4) -#define pgoff_to_pte(x) __pte(((x) << 4) | PTE_FILE) +#define pte_to_pgoff(x) (pte_val(x) >> 3) +#define pgoff_to_pte(x) __pte(((x) << 3) | PTE_FILE) -#define PTE_FILE_MAX_BITS 60 +#define PTE_FILE_MAX_BITS 55 extern int kern_addr_valid(unsigned long addr); |