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.
Since RISC-V has page based PMDs, no software walkers and IPI based
TLB invalidation, it can use the simple tlb_remove_page() based
freeer.
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
arch/riscv/include/asm/pgalloc.h | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
--- a/arch/riscv/include/asm/pgalloc.h
+++ b/arch/riscv/include/asm/pgalloc.h
@@ -73,14 +73,15 @@ static inline void pmd_free(struct mm_st
free_page((unsigned long)pmd);
}
-#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd)
+#define __pmd_free_tlb(tlb, pmd, addr) \
+ tlb_remove_table((tlb), virt_to_page(pmd))
#endif /* __PAGETABLE_PMD_FOLDED */
-#define __pte_free_tlb(tlb, pte, buf) \
-do { \
- pgtable_pte_page_dtor(pte); \
- tlb_remove_page((tlb), pte); \
+#define __pte_free_tlb(tlb, pte, buf) \
+do { \
+ pgtable_pte_page_dtor(pte); \
+ tlb_remove_table((tlb), (pte)); \
} while (0)
#endif /* CONFIG_MMU */
