From nobody Mon Apr 27 09:14:12 2026 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 CD9B8C433EF for ; Wed, 15 Jun 2022 01:39:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343700AbiFOBjY (ORCPT ); Tue, 14 Jun 2022 21:39:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38904 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241605AbiFOBjO (ORCPT ); Tue, 14 Jun 2022 21:39:14 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 59CCE36B66 for ; Tue, 14 Jun 2022 18:39:09 -0700 (PDT) Received: from linux.localdomain (unknown [113.200.148.30]) by mail.loongson.cn (Coremail) with SMTP id AQAAf9DxP046OKliBLNCAA--.5517S3; Wed, 15 Jun 2022 09:39:07 +0800 (CST) From: Tiezhu Yang To: Huacai Chen , WANG Xuerui Cc: Xuefeng Li , Jianmin Lv , Jun Yi , linux-kernel@vger.kernel.org Subject: [RFC PATCH 1/2] LoongArch: Only clone and clone3 need to call SAVE_STATIC Date: Wed, 15 Jun 2022 09:39:04 +0800 Message-Id: <1655257145-24140-2-git-send-email-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1655257145-24140-1-git-send-email-yangtiezhu@loongson.cn> References: <1655257145-24140-1-git-send-email-yangtiezhu@loongson.cn> X-CM-TRANSID: AQAAf9DxP046OKliBLNCAA--.5517S3 X-Coremail-Antispam: 1UD129KBjvdXoWrZr1ktw17tr1kWr4UGryrCrg_yoWDtwb_A3 ZrGa1UWrWrAa92vF9Fqw4fXasFyw48KFnYy3Z7WrWYka45try7twsIqw1UZFs8Krs5XrsY vrWjgFyvkr1YkjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbhxFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUGwA2048vs2IY02 0Ec7CjxVAFwI0_JFI_Gr1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW8JVW5JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1l84 ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVCY1x0267AKxVW8Jr0_Cr1U M2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjx v20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1l F7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7MxkIecxEwVAFwVWkMxAIw2 8IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4l x2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUAVWUtwCIc40Y0x0EwIxGrw CI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI 42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z2 80aVCY1x0267AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7VUboKZtUUUUU== 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" In handle_syscall, it is unnecessary to call SAVE_STATIC for all syscalls, only clone and clone3 need to do this operation, so it is better to check the syscall number before call SAVE_STATIC. Signed-off-by: Tiezhu Yang --- arch/loongarch/kernel/entry.S | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/loongarch/kernel/entry.S b/arch/loongarch/kernel/entry.S index d5b3dbc..551b6ec 100644 --- a/arch/loongarch/kernel/entry.S +++ b/arch/loongarch/kernel/entry.S @@ -14,6 +14,7 @@ #include #include #include +#include =20 .text .cfi_sections .debug_frame @@ -56,8 +57,20 @@ SYM_FUNC_START(handle_syscall) cfi_st u0, PT_R21 cfi_st fp, PT_R22 =20 + /* + * Syscall number held in a7. + * If syscall number is __NR_clone and __NR_clone3, call SAVE_STATIC. + */ + li.w t3, __NR_clone + beq a7, t3, 1f + li.w t3, __NR_clone3 + beq a7, t3, 1f + b 2f + +1: SAVE_STATIC =20 +2: move u0, t0 li.d tp, ~_THREAD_MASK and tp, tp, sp --=20 2.1.0 From nobody Mon Apr 27 09:14:12 2026 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 2FFB0C433EF for ; Wed, 15 Jun 2022 01:39:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244589AbiFOBj0 (ORCPT ); Tue, 14 Jun 2022 21:39:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38850 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238027AbiFOBjP (ORCPT ); Tue, 14 Jun 2022 21:39:15 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 055A633A25 for ; Tue, 14 Jun 2022 18:39:09 -0700 (PDT) Received: from linux.localdomain (unknown [113.200.148.30]) by mail.loongson.cn (Coremail) with SMTP id AQAAf9DxP046OKliBLNCAA--.5517S4; Wed, 15 Jun 2022 09:39:08 +0800 (CST) From: Tiezhu Yang To: Huacai Chen , WANG Xuerui Cc: Xuefeng Li , Jianmin Lv , Jun Yi , linux-kernel@vger.kernel.org Subject: [RFC PATCH 2/2] LoongArch: No need to call RESTORE_ALL_AND_RET for all syscalls Date: Wed, 15 Jun 2022 09:39:05 +0800 Message-Id: <1655257145-24140-3-git-send-email-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1655257145-24140-1-git-send-email-yangtiezhu@loongson.cn> References: <1655257145-24140-1-git-send-email-yangtiezhu@loongson.cn> X-CM-TRANSID: AQAAf9DxP046OKliBLNCAA--.5517S4 X-Coremail-Antispam: 1UD129KBjvJXoW7CF1rXw4UCF47tr1xur4kJFb_yoW8WFW7p3 ZrZFn7tr40gr93A34ayryxurZFyanrGa129FsFkryruw1kXr98ZFyvva4DtF12yw48KrW0 ga4rGwnIgFyUXwUanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBv14x267AKxVW5JVWrJwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_Jryl82xGYIkIc2 x26xkF7I0E14v26r4j6ryUM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0 Y4vE2Ix0cI8IcVAFwI0_Gr0_Xr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Cr0_Gr1UM2 8EF7xvwVC2z280aVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gr1j6F4U JwAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7 IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4U M4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwCY02Avz4vE14v_KwCF04 k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18 MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_JF0_Jw1lIxkGc2Ij64vIr4 1lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1l IxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4 A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JU7nYwUUUUU= 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" In handle_syscall, it is unnecessary to call RESTORE_ALL_AND_RET for all syscalls, clone and clone3 should call RESTORE_STATIC_SOME_AND_RET, and the other syscalls should call RESTORE_SOME_AND_RET. Signed-off-by: Tiezhu Yang --- arch/loongarch/include/asm/stackframe.h | 10 ++++++++++ arch/loongarch/kernel/entry.S | 12 +++++++++++- 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/arch/loongarch/include/asm/stackframe.h b/arch/loongarch/inclu= de/asm/stackframe.h index 4ca9530..9869b39 100644 --- a/arch/loongarch/include/asm/stackframe.h +++ b/arch/loongarch/include/asm/stackframe.h @@ -216,4 +216,14 @@ RESTORE_SP_AND_RET \docfi .endm =20 + .macro RESTORE_STATIC_SOME_AND_RET docfi=3D0 + RESTORE_STATIC \docfi + RESTORE_SOME \docfi + RESTORE_SP_AND_RET \docfi + .endm + + .macro RESTORE_SOME_AND_RET docfi=3D0 + RESTORE_SOME \docfi + RESTORE_SP_AND_RET \docfi + .endm #endif /* _ASM_STACKFRAME_H */ diff --git a/arch/loongarch/kernel/entry.S b/arch/loongarch/kernel/entry.S index 551b6ec..8176094 100644 --- a/arch/loongarch/kernel/entry.S +++ b/arch/loongarch/kernel/entry.S @@ -78,7 +78,17 @@ SYM_FUNC_START(handle_syscall) move a0, sp bl do_syscall =20 - RESTORE_ALL_AND_RET + /* + * Syscall number held in a7. + * If syscall number is __NR_clone and __NR_clone3, call RESTORE_STATIC_S= OME_AND_RET. + */ + li.w t3, __NR_clone + beq a7, t3, 3f + li.w t3, __NR_clone3 + beq a7, t3, 3f + RESTORE_SOME_AND_RET +3: + RESTORE_STATIC_SOME_AND_RET SYM_FUNC_END(handle_syscall) =20 SYM_CODE_START(ret_from_fork) --=20 2.1.0