From nobody Tue Feb 10 01:58:50 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 5AADFC761AF for ; Wed, 5 Apr 2023 18:04:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233966AbjDESEQ (ORCPT ); Wed, 5 Apr 2023 14:04:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233915AbjDESDy (ORCPT ); Wed, 5 Apr 2023 14:03:54 -0400 Received: from mail-wm1-x329.google.com (mail-wm1-x329.google.com [IPv6:2a00:1450:4864:20::329]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA8416A62 for ; Wed, 5 Apr 2023 11:03:15 -0700 (PDT) Received: by mail-wm1-x329.google.com with SMTP id n19-20020a05600c501300b003f064936c3eso1684278wmr.0 for ; Wed, 05 Apr 2023 11:03:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1680717779; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=nCRr5H3+UuYPyZozTZ61KEaaCsnzGj0McQyaAuLox6Y=; b=VRGLF6jYpqlAUjlImbNGc9MAbL+CwYzIVyjcpCvSfXD6sQX9PKy+4myAOoc4WbAbkW D+KltU67z9hJ+/GOxp6DrjoYihchae67PJR3xjST8iAKcNjCodZ15EgPWNvXbCCblr5b zYr2eOXongK1hoZvSmIoEoGWnCFuVT/ZDbl1Q= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680717779; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=nCRr5H3+UuYPyZozTZ61KEaaCsnzGj0McQyaAuLox6Y=; b=Ndsch+Jd4qdh1/tFSfz5kiK6NKFGPxwD494zthX18jJHGBeYaBWKiJ1UCHX+KdCzwY N5D8DPqcyz43o7VM36BRoYyQOH0SEPaI7o5TAP5+X3ngdeTAqEj8rHA1cmCesv4AkjQF Z7L/Evt8w24b+PLAJi/bzQglVil7ZU4V6dOfQHKJQSn00CW9s1i2Thl+8MaBqSox94td M/ajtaOpTObYMij6ci6iUmoNco6VSWMEXpSWfOUqOrDSG4MIKa2/gaQy6Vm4ueu5ZLE+ jOveKgGIlo183KL0odUhNb5qO6byfAA8dB4P3dJ34ISIhOUP14EsXSpWmoxqtnKb2Bx6 UadA== X-Gm-Message-State: AAQBX9etWONAB2VOdx49xpUaLJZ4MXsJ0iatsZxrEwWj+swg62rZ9KX0 RGhXEFDttyJEaR0C9KAUdWCtJQ== X-Google-Smtp-Source: AKy350bceighfDjd/DZgGBjsH+Kb8HCWWBPSbtjJxKcBSXp/7bD2cQK/+06fC/OP05iTqgJ5Bh0azg== X-Received: by 2002:a7b:cc98:0:b0:3ed:8079:27d7 with SMTP id p24-20020a7bcc98000000b003ed807927d7mr5232746wma.40.1680717778801; Wed, 05 Apr 2023 11:02:58 -0700 (PDT) Received: from revest.zrh.corp.google.com ([2a00:79e0:9d:6:cf6a:9ae6:15f1:4213]) by smtp.gmail.com with ESMTPSA id bd5-20020a05600c1f0500b003f0472ffc7csm2913233wmb.11.2023.04.05.11.02.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Apr 2023 11:02:58 -0700 (PDT) From: Florent Revest To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org Cc: catalin.marinas@arm.com, will@kernel.org, rostedt@goodmis.org, mhiramat@kernel.org, mark.rutland@arm.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kpsingh@kernel.org, jolsa@kernel.org, xukuohai@huaweicloud.com, lihuafei1@huawei.com, Florent Revest Subject: [PATCH v6 3/5] samples: ftrace: Save required argument registers in sample trampolines Date: Wed, 5 Apr 2023 20:02:48 +0200 Message-Id: <20230405180250.2046566-4-revest@chromium.org> X-Mailer: git-send-email 2.40.0.577.gac1e443424-goog In-Reply-To: <20230405180250.2046566-1-revest@chromium.org> References: <20230405180250.2046566-1-revest@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The ftrace-direct-too sample traces the handle_mm_fault function whose signature changed since the introduction of the sample. Since: commit bce617edecad ("mm: do page fault accounting in handle_mm_fault") handle_mm_fault now has 4 arguments. Therefore, the sample trampoline should save 4 argument registers. s390 saves all argument registers already so it does not need a change but x86_64 needs an extra push and pop. This also evolves the signature of the tracing function to make it mirror the signature of the traced function. Signed-off-by: Florent Revest Reviewed-by: Mark Rutland Reviewed-by: Steven Rostedt (Google) --- samples/ftrace/ftrace-direct-too.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-dir= ect-too.c index f28e7b99840f..71ed4ee8cb4a 100644 --- a/samples/ftrace/ftrace-direct-too.c +++ b/samples/ftrace/ftrace-direct-too.c @@ -5,14 +5,14 @@ #include #include =20 -extern void my_direct_func(struct vm_area_struct *vma, - unsigned long address, unsigned int flags); +extern void my_direct_func(struct vm_area_struct *vma, unsigned long addre= ss, + unsigned int flags, struct pt_regs *regs); =20 -void my_direct_func(struct vm_area_struct *vma, - unsigned long address, unsigned int flags) +void my_direct_func(struct vm_area_struct *vma, unsigned long address, + unsigned int flags, struct pt_regs *regs) { - trace_printk("handle mm fault vma=3D%p address=3D%lx flags=3D%x\n", - vma, address, flags); + trace_printk("handle mm fault vma=3D%p address=3D%lx flags=3D%x regs=3D%p= \n", + vma, address, flags, regs); } =20 extern void my_tramp(void *); @@ -34,7 +34,9 @@ asm ( " pushq %rdi\n" " pushq %rsi\n" " pushq %rdx\n" +" pushq %rcx\n" " call my_direct_func\n" +" popq %rcx\n" " popq %rdx\n" " popq %rsi\n" " popq %rdi\n" --=20 2.40.0.577.gac1e443424-goog