Messages in this thread Patch in this message | | | Date | Fri, 17 Jul 2020 13:10:14 +0200 | From | Peter Zijlstra <> | Subject | [PATCH v2 09/11] nds32/tlb: Fix __p*_free_tlb() |
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Just like regular pages, page directories need to observe the following order:
1) unhook 2) TLB invalidate 3) free
to ensure it is safe against concurrent accesses.
Even though NDS32 is UP only, we still need to observe this order because mmu_gather is preemptible.
NDS32 does not in fact have PMDs.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- arch/nds32/include/asm/tlb.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
--- a/arch/nds32/include/asm/tlb.h +++ b/arch/nds32/include/asm/tlb.h @@ -6,6 +6,11 @@ #include <asm-generic/tlb.h> -#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte) +#define __pte_free_tlb(tlb, pte, address) \ +do { \ + pgtable_pte_page_dtor(pte); \ + tlb_remove_table((tlb), (pte)); \ +} while (0) + #endif
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