diff mbox series

[16/17] nds32/tlb: Fix __p*_free_tlb()

Message ID 20191211122956.572325873@infradead.org (mailing list archive)
State New, archived
Headers show
Series Fixup page directory freeing | expand

Commit Message

Peter Zijlstra Dec. 11, 2019, 12:07 p.m. UTC 
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(-)
diff mbox series

Patch

--- a/arch/nds32/include/asm/tlb.h
+++ b/arch/nds32/include/asm/tlb.h
@@ -6,7 +6,12 @@ 
 
 #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)
+
 #define __pmd_free_tlb(tlb, pmd, addr)	pmd_free((tln)->mm, pmd)
 
 #endif