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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-26 15:03:49 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-26 15:03:49 -0800 |
| commit | bbecb1cfcca55f98cfcb62fa36a32d79975d8816 (patch) | |
| tree | ac86a653ea2c9e3c0352b7975026fde14dd3dec1 /arch/arm/include/asm/pgtable.h | |
| parent | dec0029a59779d8279dde663ef8abe9824ee5773 (diff) | |
| parent | 8bafae202c82dc257f649ea3c275a0f35ee15113 (diff) | |
| download | linux-bbecb1cfcca55f98cfcb62fa36a32d79975d8816.tar.bz2 | |
Merge branch 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm
Pull ARM fixes from Russell King:
- LPAE fixes for kernel-readonly regions
- Fix for get_user_pages_fast on LPAE systems
- avoid tying decompressor to a particular platform if DEBUG_LL is
enabled
- BUG if we attempt to return to userspace but the to-be-restored PSR
value keeps us in privileged mode (defeating an issue that ftracetest
found)
* 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm:
ARM: BUG if jumping to usermode address in kernel mode
ARM: 8722/1: mm: make STRICT_KERNEL_RWX effective for LPAE
ARM: 8721/1: mm: dump: check hardware RO bit for LPAE
ARM: make decompressor debug output user selectable
ARM: fix get_user_pages_fast
Diffstat (limited to 'arch/arm/include/asm/pgtable.h')
| -rw-r--r-- | arch/arm/include/asm/pgtable.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 1c462381c225..150ece66ddf3 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -232,6 +232,18 @@ static inline pte_t *pmd_page_vaddr(pmd_t pmd) #define pte_valid_user(pte) \ (pte_valid(pte) && pte_isset((pte), L_PTE_USER) && pte_young(pte)) +static inline bool pte_access_permitted(pte_t pte, bool write) +{ + pteval_t mask = L_PTE_PRESENT | L_PTE_USER; + pteval_t needed = mask; + + if (write) + mask |= L_PTE_RDONLY; + + return (pte_val(pte) & mask) == needed; +} +#define pte_access_permitted pte_access_permitted + #if __LINUX_ARM_ARCH__ < 6 static inline void __sync_icache_dcache(pte_t pteval) { |