From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9344FC433ED for ; Fri, 7 May 2021 14:26:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 46FE76142C for ; Fri, 7 May 2021 14:26:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237647AbhEGO1A (ORCPT ); Fri, 7 May 2021 10:27:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55974 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235948AbhEGO07 (ORCPT ); Fri, 7 May 2021 10:26:59 -0400 Received: from ustc.edu.cn (email6.ustc.edu.cn [IPv6:2001:da8:d800::8]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 87221C061574 for ; Fri, 7 May 2021 07:25:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mail.ustc.edu.cn; s=dkim; h=Received:Date:From:To:Cc:Subject: Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding; bh=M9VvS8e9uZJKj3MO0SwqDdKf35V5JGIaFIP2nALz/jg=; b=H38Gs9Zw3OgBa Li1eGnNy9a5Rsg+JMnP7ee052GW4mWrLV3JNxl9ojDTewrNw79RntahEIc5U+zi6 UWLiEcdEZJWMYwHbiC4qy/Mhf2HEt6vlii14tItnKbReQ/w+X+H+cceFSPvGVuMV clIu5ZRjQasWBLRxLi8WUa6KMAQBbs= Received: from xhacker (unknown [101.86.20.15]) by newmailweb.ustc.edu.cn (Coremail) with SMTP id LkAmygDHzprLTZVgPsubAA--.61735S2; Fri, 07 May 2021 22:25:15 +0800 (CST) Date: Fri, 7 May 2021 22:19:59 +0800 From: Jisheng Zhang To: Paul Walmsley , Palmer Dabbelt , Albert Ou Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] riscv: mm: Remove setup_zero_page() Message-ID: <20210507221959.2db29936@xhacker> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-CM-TRANSID: LkAmygDHzprLTZVgPsubAA--.61735S2 X-Coremail-Antispam: 1UD129KBjvJXoW7Ar1rCr4Utr1kAr17JrW7CFg_yoW8GF1xpr WrGa48urW3Jrs7GFZ2yryqvr18JFn3K34SqryUCwn8Za17Zrn2qr95Kw1rZryqkr4ruayF ka4xJ34S93WUAa7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUyFb7Iv0xC_Kw4lb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rw A2F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xII jxv20xvEc7CjxVAFwI0_Cr0_Gr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I 8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI 64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8Jw Am72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IY64vIr41l42xK82IYc2Ij64vIr41l4I8I3I0E 4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGV WUWwC2zVAF1VAY17CE14v26r126r1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_ Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE42xK8VAvwI8IcIk0rV WrZr1j6s0DMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Jr0_ GrUvcSsGvfC2KfnxnUUI43ZEXa7IU5PpnJUUUUU== X-CM-SenderInfo: xmv2xttqjtqzxdloh3xvwfhvlgxou0/ Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.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 Reviewed-by: Anup Patel --- 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) free_area_init(max_zone_pfns); } -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_vm_final(); - setup_zero_page(); } void __init misc_mem_init(void) -- 2.31.0