From nobody Mon May 6 18:45:54 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2F610C04A95 for ; Wed, 28 Sep 2022 23:59:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233015AbiI1X7p (ORCPT ); Wed, 28 Sep 2022 19:59:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234550AbiI1X72 (ORCPT ); Wed, 28 Sep 2022 19:59:28 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 199ED10E5CD for ; Wed, 28 Sep 2022 16:59:10 -0700 (PDT) Received: from linux.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8AxFeLI3zRjToIjAA--.2987S2; Thu, 29 Sep 2022 07:59:05 +0800 (CST) From: Tiezhu Yang To: Huacai Chen Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH] LoongArch: Remove some save operations in SAVE_SOME and handle_syscall Date: Thu, 29 Sep 2022 07:59:03 +0800 Message-Id: <1664409543-31214-1-git-send-email-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.1.0 X-CM-TRANSID: AQAAf8AxFeLI3zRjToIjAA--.2987S2 X-Coremail-Antispam: 1UD129KBjvJXoW7KFWkGr1fuw1UCr4kAw15twb_yoW8Aw1fpF 1fArn2grW09ryxA3W8tr98uFyUAan7uw4aqa47JFWFyr43ZFyjvw18AFyDJFyYgw4rWw1I 93Z3AwnavF4rJ3JanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUkjb7Iv0xC_tr1lb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rw A2F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Jr0_JF4l84ACjcxK6xII jxv20xvEc7CjxVAFwI0_Jr0_Gr1l84ACjcxK6I8E87Iv67AKxVW8JVWxJwA2z4x0Y4vEx4 A2jsIEc7CjxVAFwI0_Gr0_Gr1UM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI 64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8Jw Am72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc2xSY4AK67AK6FWl42xK82IY c2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s 026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1Y6r17MIIYrxkI7VAKI48JMIIF 0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0x vE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv 6xkF7I0E14v26r1j6r4UYxBIdaVFxhVjvjDU0xZFpf9x07j3_-PUUUUU= X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" No need to save the control and status registers CRMD, EUEN, ECFG and ESTAT in SAVE_SOME and handle_syscall as they are not restored later in RESTORE_SOME. Signed-off-by: Tiezhu Yang --- arch/loongarch/include/asm/stackframe.h | 9 --------- arch/loongarch/kernel/entry.S | 8 -------- 2 files changed, 17 deletions(-) diff --git a/arch/loongarch/include/asm/stackframe.h b/arch/loongarch/inclu= de/asm/stackframe.h index 4ca9530..733dc9e 100644 --- a/arch/loongarch/include/asm/stackframe.h +++ b/arch/loongarch/include/asm/stackframe.h @@ -114,14 +114,6 @@ LONG_S zero, sp, PT_R0 csrrd t0, LOONGARCH_CSR_PRMD LONG_S t0, sp, PT_PRMD - csrrd t0, LOONGARCH_CSR_CRMD - LONG_S t0, sp, PT_CRMD - csrrd t0, LOONGARCH_CSR_EUEN - LONG_S t0, sp, PT_EUEN - csrrd t0, LOONGARCH_CSR_ECFG - LONG_S t0, sp, PT_ECFG - csrrd t0, LOONGARCH_CSR_ESTAT - PTR_S t0, sp, PT_ESTAT cfi_st ra, PT_R1, \docfi cfi_st a0, PT_R4, \docfi cfi_st a1, PT_R5, \docfi @@ -140,7 +132,6 @@ cfi_st fp, PT_R22, \docfi =20 /* Set thread_info if we're coming from user mode */ - csrrd t0, LOONGARCH_CSR_PRMD andi t0, t0, 0x3 /* extract pplv bit */ beqz t0, 9f =20 diff --git a/arch/loongarch/kernel/entry.S b/arch/loongarch/kernel/entry.S index d53b631..893e632 100644 --- a/arch/loongarch/kernel/entry.S +++ b/arch/loongarch/kernel/entry.S @@ -31,14 +31,6 @@ SYM_FUNC_START(handle_syscall) st.d zero, sp, PT_R0 csrrd t2, LOONGARCH_CSR_PRMD st.d t2, sp, PT_PRMD - csrrd t2, LOONGARCH_CSR_CRMD - st.d t2, sp, PT_CRMD - csrrd t2, LOONGARCH_CSR_EUEN - st.d t2, sp, PT_EUEN - csrrd t2, LOONGARCH_CSR_ECFG - st.d t2, sp, PT_ECFG - csrrd t2, LOONGARCH_CSR_ESTAT - st.d t2, sp, PT_ESTAT cfi_st ra, PT_R1 cfi_st a0, PT_R4 cfi_st a1, PT_R5 --=20 2.1.0