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Date:   Tue, 13 Apr 2021 00:11:59 +0800
From:   Jisheng Zhang <jszhang3@mail.ustc.edu.cn>
To:     Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
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        Andrey Konovalov <andreyknvl@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        " =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?=" <bjorn@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andrii@kernel.org>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
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        KP Singh <kpsingh@kernel.org>,
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        Xi Wang <xi.wang@gmail.com>, Anup Patel <anup@brainfault.org>
Cc:     linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 01/10] riscv: mm: Remove setup_zero_page()
Message-ID: <20210413001159.341a95d6@xhacker>
In-Reply-To: <20210413001110.7209bae6@xhacker>
References: <20210413001110.7209bae6@xhacker>
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From: Jisheng Zhang <jszhang@kernel.org>

The empty_zero_page sits at .bss..page_aligned section, so will be
cleared to zero during clearing bss, we don't need to clear it again.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
---
 arch/riscv/mm/init.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 7f5036fbee8c..dbeaa4144e4d 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -57,11 +57,6 @@ static void __init zone_sizes_init(void)
 	free_area_init(max_zone_pfns);
 }
 
-static void setup_zero_page(void)
-{
-	memset((void *)empty_zero_page, 0, PAGE_SIZE);
-}
-
 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
 {
@@ -589,7 +584,6 @@ void mark_rodata_ro(void)
 void __init paging_init(void)
 {
 	setup_vm_final();
-	setup_zero_page();
 }
 
 void __init misc_mem_init(void)
-- 
2.31.0