[PATCH 5/9] mm: convert PTE table entries in ptep_get()
Muhammad Usama Anjum <[email protected]>
| Newsgroups | dev.linux.lists.damon,org.freedesktop.lists.dri-devel,org.freedesktop.lists.intel-gfx,org.kernel.vger.bpf,org.kernel.vger.linux-arch,org.kernel.vger.linux-fsdevel,org.kernel.vger.linux-kernel,org.kernel.vger.linux-parisc,org.kernel.vger.linux-perf-users,org.kernel.vger.linux-trace-kernel,org.kvack.linux-mm,org.xenproject.lists.xen-devel |
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| Message-ID | <[email protected]> |
ptep_get() now accepts a pointer to hw_pte_t storage but must continue to return a logical pte_t value. Add __pte_from_hw for both generic hw_pte_t definitions. Read the hw_pte_t table element atomically before converting it to pte_t. Signed-off-by: Muhammad Usama Anjum <[email protected]> --- Changes since RFC v1: - Define __pte_from_hw for the opted-in generic wrapper. - Apply READ_ONCE() to hw_pte_t before converting it to pte_t. --- include/linux/pgtable.h | 2 +- include/linux/pgtable_types.h | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index dad80d264aac2..1768421755a9c 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -493,7 +493,7 @@ static inline int pudp_set_access_flags(struct vm_area_struct *vma, #ifndef ptep_get static inline pte_t ptep_get(hw_pte_t *ptep) { - return READ_ONCE(*ptep); + return __pte_from_hw(READ_ONCE(*ptep)); } #endif diff --git a/include/linux/pgtable_types.h b/include/linux/pgtable_types.h index 70c3edd00a01b..a625516fd67b1 100644 --- a/include/linux/pgtable_types.h +++ b/include/linux/pgtable_types.h @@ -8,8 +8,10 @@ #ifdef CONFIG_ARCH_HAS_HW_PTE_T typedef struct { pte_t __pte; } hw_pte_t; +#define __pte_from_hw(pte) ((pte).__pte) #else #define hw_pte_t pte_t +#define __pte_from_hw(pte) (pte) #endif #endif /* !__ASSEMBLY__ */ -- 2.47.3