From patchwork Fri Sep 23 08:46:55 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Liao, Chang" X-Patchwork-Id: 12986320 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 91C49C6FA82 for ; Fri, 23 Sep 2022 08:51:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=dQpGtniEKW349yX+CxPoQ+OGh4Z2tEDuPzo2dTyeYyo=; b=bFw3HTiMql4/iE JvyoePqXcu2pw6uwzoCUljg38cp9yjQquYzQHi9LPqmEvQUS755ehS8DpmdJ92OsFfrIKMzTV2SfO vBfKt4hZFF+6fB41+AvxqKbHkEwOcSEyVDDAhk117225JBH98YzqvQvTOKc8Ck8z49oIYeVmZdvki x80qaQbg77wkqgYvZsfbZm694lw7owdYiGjZSQSBM9oSnHzsyFIgbpIjPkV4KteRKNoqzAhcjkcua m9t0lrJ4kuu7rknNlfkYUBKNtXpaG2nULnUaD0dD9BmmG5PkacADyofI+4vitMZkmP0nfMaG/B+rJ kiJPMfAsJnLieOb6+diA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1obeP1-0033hl-DB; Fri, 23 Sep 2022 08:51:19 +0000 Received: from szxga03-in.huawei.com ([45.249.212.189]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1obeOS-0033Q8-St; Fri, 23 Sep 2022 08:50:47 +0000 Received: from kwepemi500012.china.huawei.com (unknown [172.30.72.55]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4MYm5R4xnjzHqQg; Fri, 23 Sep 2022 16:48:27 +0800 (CST) Received: from huawei.com (10.67.174.53) by kwepemi500012.china.huawei.com (7.221.188.12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Fri, 23 Sep 2022 16:50:38 +0800 From: Liao Chang To: , , , , , , , , , , , CC: , , , Subject: [PATCH V3 0/3] kprobe: Optimize the performance of patching ss Date: Fri, 23 Sep 2022 16:46:55 +0800 Message-ID: <20220923084658.99304-1-liaochang1@huawei.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.67.174.53] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To kwepemi500012.china.huawei.com (7.221.188.12) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220923_015045_124164_E4954259 X-CRM114-Status: UNSURE ( 4.56 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Single-step slot would not be used until kprobe is enabled, that means no race condition occurs on it under SMP, hence it is safe to pacth ss slot without stopping machine. v3: 1. Drop duplicated I-Cache maintenance for arm64. 2. Add Acked-by from Masami Hiramatsu. v2: Backport riscv patch to cksy and arm64. Liao Chang (3): riscv/kprobe: Optimize the performance of patching single-step slot csky/kprobe: Optimize the performance of patching single-step slot arm64/kprobe: Optimize the performance of patching single-step slot arch/arm64/kernel/probes/kprobes.c | 7 ++----- arch/csky/kernel/probes/kprobes.c | 6 +++++- arch/riscv/kernel/probes/kprobes.c | 8 +++++--- 3 files changed, 12 insertions(+), 9 deletions(-)