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 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 CF651C2BD09 for ; Thu, 27 Jun 2024 14:12:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ILV04pjjyJn+7OyTAQiRBHx51ZzvtZ8xw6hyibxww5I=; b=pTybGtjiH17Fy8dXerbPGXvEs1 r4t5YqMB5qHJ2GFuBiuAMKXbdIBoSKE86RLxReYXAOtwR/7glaUwkJx165E65YqLAFIlWKzYEjYQW Wv75h3RJ9jtZs9SHvYy61GPZWvbtQ8u9mvCOhmDvTe5/g0++bcOf2gM3GbOqTQtFCHwWMUxMIxIEj lA50MbvpxYM+FnkXUxfBAIr1TfixDOFMQRundj3g78DyrDcyj8NkOWdLNLzX3lSRqEU5b6WunIj27 OSTmoxW3+1EpZg1Uozy0GmO+A+EmONA4OG+8W1viYDEdqKTsUo7GtywQODTc+kt9yM/2BOtXiAgHR 8xWrUiiw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sMprJ-0000000Ab02-3vpj; Thu, 27 Jun 2024 14:12:22 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sMpr9-0000000Aaum-2ww6 for linux-arm-kernel@lists.infradead.org; Thu, 27 Jun 2024 14:12:14 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id A5BC061EBB; Thu, 27 Jun 2024 14:12:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2B892C32786; Thu, 27 Jun 2024 14:12:09 +0000 (UTC) Date: Thu, 27 Jun 2024 10:12:07 -0400 From: Steven Rostedt To: Marc Zyngier Cc: richard clark , Mark Rutland , will@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, "Russell King (Oracle)" , Linus Torvalds Subject: Re: Will smp_call_function_single(cpu, ...) broadcast IPI to all other cpus? Message-ID: <20240627101207.0bbbead0@rorschach.local.home> In-Reply-To: <86pls2isal.wl-maz@kernel.org> References: <86pls2isal.wl-maz@kernel.org> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240627_071212_232565_F187608C X-CRM114-Status: UNSURE ( 7.74 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 27 Jun 2024 11:38:58 +0100 Marc Zyngier wrote: > You may want to enable stack trace recording and find out for yourself > where these ipi_raise() calls are coming from. Try trace-cmd: # trace-cmd start -e ipi_raise -R 'stacktrace if reason=="Function call interrupts"' # taskset -c 0 insmod /kmods/ipi_test.ko # trace-cmd stop # trace-cmd show -- Steve