linux-kernel - [PATCH 2/3] arm64: mmu: early_pgtable_alloc: remove unnecessary comments

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Date:   Wed, 13 Feb 2019 09:37:29 +0000
From:   Peng Fan <peng.fan@....com>
To:     "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
        "yaojun8558363@...il.com" <yaojun8558363@...il.com>,
        "cpandya@...eaurora.org" <cpandya@...eaurora.org>,
        "robin.murphy@....com" <robin.murphy@....com>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "van.freenix@...il.com" <van.freenix@...il.com>,
        Peng Fan <peng.fan@....com>
Subject: [PATCH 2/3] arm64: mmu: early_pgtable_alloc: remove unnecessary
 comments

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.

There is no code to reflect the comment, so remove it.

Signed-off-by: Peng Fan <peng.fan@....com>
---
 arch/arm64/mm/mmu.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 065202da3ad2..f61fa7c8fd2e 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -113,10 +113,6 @@ static phys_addr_t __init early_pgtable_alloc(void)
 
 	memset(ptr, 0, PAGE_SIZE);
 
-	/*
-	 * Implicit barriers also ensure the zeroed page is visible to the page
-	 * table walker
-	 */
 	pte_clear_fixmap();
 
 	return phys;
-- 
2.16.4