[PATCH] riscv: mm: Remove setup_zero_page()

Jisheng Zhang jszhang3 at mail.ustc.edu.cn
Fri May 7 07:19:59 PDT 2021

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 at kernel.org>
Reviewed-by: Anup Patel <anup at brainfault.org>

Hi Palmer,

This patch was one of v3 series of "riscv: improve self-protection"
and acked by Anup. I checked Linus tree this tonight, it seems the v2 or
v1 was merged, this patch is missing, so I rebased and sent out this patch.
If it's late for linux-5.13, then I can rebase again once linux-5.13-rc1
is released.

Thanks in advance

 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 dfb5e4f7a670..4a68b029e3d2 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -67,11 +67,6 @@ static void __init zone_sizes_init(void)
-static void __init 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)
@@ -862,7 +857,6 @@ RESERVEDMEM_OF_DECLARE(elfcorehdr, "linux,elfcorehdr", elfcore_hdr_setup);
 void __init paging_init(void)
-	setup_zero_page();
 void __init misc_mem_init(void)

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