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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 43446C433B4 for ; Mon, 5 Apr 2021 16:07:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 22B6A613C0 for ; Mon, 5 Apr 2021 16:07:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239435AbhDEQHY (ORCPT ); Mon, 5 Apr 2021 12:07:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:56730 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242241AbhDEQFT (ORCPT ); Mon, 5 Apr 2021 12:05:19 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id ABCFE613E4; Mon, 5 Apr 2021 16:05:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1617638713; bh=wZezF9NjlRxzyY2KSa8U5LwaxrCQeO5jCSc2/VBDak0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fgSjY/xdS4924KFoXOaQCRGXukbLcCGb0mMIpoPuZUnTzwqk432cv1nnuVfvv3hRF F8dWXxLe1duM6kqOwSmp5m2CWwT7XPeatATncWkRyfAEOlJ6I241K737wEb57/3T5y i0qUsX8iYhZS5X+wpo4P9oUT4PqtvkswMovCCX2I38O95bR8Gq3IRz+0PfKuWMYfOF sFp4YMp74hoYOO8j2iAC1KwcTgonJWnYh9HdMejVx7j1sgaELKY9txK6YVM7/P9Jl6 4xhKYlt5BydKlGXGFZjHqJc3X5Wxt0vtYRyCftwt2Ufi3JBprwFkJLLxDUFPDDjPH1 SKBszstgntfQA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zihao Yu , Anup Patel , Palmer Dabbelt , Sasha Levin , linux-riscv@lists.infradead.org Subject: [PATCH AUTOSEL 5.4 12/13] riscv,entry: fix misaligned base for excp_vect_table Date: Mon, 5 Apr 2021 12:04:57 -0400 Message-Id: <20210405160459.268794-12-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210405160459.268794-1-sashal@kernel.org> References: <20210405160459.268794-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zihao Yu [ Upstream commit ac8d0b901f0033b783156ab2dc1a0e73ec42409b ] In RV64, the size of each entry in excp_vect_table is 8 bytes. If the base of the table is not 8-byte aligned, loading an entry in the table will raise a misaligned exception. Although such exception will be handled by opensbi/bbl, this still causes performance degradation. Signed-off-by: Zihao Yu Reviewed-by: Anup Patel Signed-off-by: Palmer Dabbelt Signed-off-by: Sasha Levin --- arch/riscv/kernel/entry.S | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index 8ca479831142..9c87ae77ad5d 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -387,6 +387,7 @@ ENTRY(__switch_to) ENDPROC(__switch_to) .section ".rodata" + .align LGREG /* Exception vector table */ ENTRY(excp_vect_table) RISCV_PTR do_trap_insn_misaligned -- 2.30.2