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| author | David Hildenbrand <david@redhat.com> | 2023-01-13 18:10:14 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-02-02 22:33:08 -0800 |
| commit | 4d1d955f7c0cdbb7562d19049f859c74276fdfeb (patch) | |
| tree | f0537894c5da00280df4f2472c57a1f5cb495231 /arch | |
| parent | 0a9ad8273ff4643dd50ff6b3ec991ab270e87a89 (diff) | |
| download | lwn-4d1d955f7c0cdbb7562d19049f859c74276fdfeb.tar.gz lwn-4d1d955f7c0cdbb7562d19049f859c74276fdfeb.zip | |
nios2/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by using the yet-unused bit
31.
Link: https://lkml.kernel.org/r/20230113171026.582290-15-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/nios2/include/asm/pgtable-bits.h | 3 | ||||
| -rw-r--r-- | arch/nios2/include/asm/pgtable.h | 22 |
2 files changed, 24 insertions, 1 deletions
diff --git a/arch/nios2/include/asm/pgtable-bits.h b/arch/nios2/include/asm/pgtable-bits.h index bfddff383e89..724f9b08b1d1 100644 --- a/arch/nios2/include/asm/pgtable-bits.h +++ b/arch/nios2/include/asm/pgtable-bits.h @@ -31,4 +31,7 @@ #define _PAGE_ACCESSED (1<<26) /* page referenced */ #define _PAGE_DIRTY (1<<27) /* dirty page */ +/* We borrow bit 31 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (1<<31) + #endif /* _ASM_NIOS2_PGTABLE_BITS_H */ diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h index d1e5c9eb4643..05999da01731 100644 --- a/arch/nios2/include/asm/pgtable.h +++ b/arch/nios2/include/asm/pgtable.h @@ -239,7 +239,9 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) * * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 - * 0 < type -> 0 0 0 0 0 0 <-------------- offset ---------------> + * E < type -> 0 0 0 0 0 0 <-------------- offset ---------------> + * + * E is the exclusive marker that is not stored in swap entries. * * Note that the offset field is always non-zero if the swap type is 0, thus * !pte_none() is always true. @@ -251,6 +253,24 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + extern void __init paging_init(void); extern void __init mmu_init(void); |