arm64: tlb: remove redundant barrier from __flush_tlb_pgtable

__flush_tlb_pgtable is used to invalidate intermediate page table
entries after they have been cleared and are about to be freed. Since
pXd_clear imply memory barriers, we don't need the extra one here.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
index 93e9f964805c616c8492e97e3471fbf2ab9789bd..b460ae28e3463db46816f678c5f90988c3f059de 100644 (file)
--- a/arch/arm64/include/asm/tlbflush.h
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -163,7 +163,6 @@ static inline void __flush_tlb_pgtable(struct mm_struct *mm,
 {
        unsigned long addr = uaddr >> 12 | (ASID(mm) << 48);
 
-       dsb(ishst);
        asm("tlbi       vae1is, %0" : : "r" (addr));
        dsb(ish);
 }