arm64: Remove unnecessary ISBs from set_{pte,pmd,pud}

Commit 7f0b1bf ("arm64: Fix barriers used for page table modifications") fixed a reported issue with fixmap page-table entries not being visible to the walker due to a missing DSB instruction. At the same time, it added ISB instructions to the arm64 set_{pte,pmd,pud} functions, which are not required by the architecture and make little sense in isolation. Remove the redundant ISBs. Acked-by: Catalin Marinas <[email protected]> Acked-by: Mark Rutland <[email protected]> Signed-off-by: Will Deacon <[email protected]> Signed-off-by: Catalin Marinas <[email protected]>
olifre · Jun 27, 2018 · 24fe1b0 · 24fe1b0
1 parent 4293886
commit 24fe1b0
Showing 1 changed file with 1 addition and 5 deletions.
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
@@ -224,10 +224,8 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
 	 * Only if the new pte is valid and kernel, otherwise TLB maintenance
 	 * or update_mmu_cache() have the necessary barriers.
 	 */
-	if (pte_valid_not_user(pte)) {
+	if (pte_valid_not_user(pte))
 		dsb(ishst);
-		isb();
-	}
 }
 
 extern void __sync_icache_dcache(pte_t pteval);
@@ -434,7 +432,6 @@ static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 {
 	WRITE_ONCE(*pmdp, pmd);
 	dsb(ishst);
-	isb();
 }
 
 static inline void pmd_clear(pmd_t *pmdp)
@@ -485,7 +482,6 @@ static inline void set_pud(pud_t *pudp, pud_t pud)
 {
 	WRITE_ONCE(*pudp, pud);
 	dsb(ishst);
-	isb();
 }
 
 static inline void pud_clear(pud_t *pudp)