Messages in this thread Patch in this message | | | From | Peng Fan <> | Subject | [PATCH 3/3] arm64: mmu: pgd_pgtable_alloc: drop barrier | Date | Wed, 13 Feb 2019 09:37:38 +0000 |
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The barriers are added for empty_zero_page, however the empty zero page has been moved to bss area by commit 5227cfa71f9e ("arm64: mm: place empty_zero_page in bss"), and it alreay added "dsb ishst" in head.S to make sure the empty zero page visible to PTW.
pgd_pgtable_alloc is only called by __create_pgd_mapping, and there are implicit barriers in __create_pgd_mapping, so we could remove the barrier pgd_pgtable_alloc
Signed-off-by: Peng Fan <peng.fan@nxp.com> ---
Note: this patch tested on qemu-system-aarch64, not real hardware.
arch/arm64/mm/mmu.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index f61fa7c8fd2e..04e3d4d070ce 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -371,8 +371,6 @@ static phys_addr_t pgd_pgtable_alloc(void) if (!ptr || !pgtable_page_ctor(virt_to_page(ptr))) BUG(); - /* Ensure the zeroed page is visible to the page table walker */ - dsb(ishst); return __pa(ptr); } -- 2.16.4
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