From patchwork Thu Jan 19 14:36:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Valentin Schneider X-Patchwork-Id: 13108205 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 4B7B8C46467 for ; Thu, 19 Jan 2023 14:41:49 +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:References:In-Reply-To: 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: List-Owner; bh=ewTWzwRw2mGDRPOxLovcgI0ZpYRp8+jTKQTtGt+Jm3k=; b=JAnyBTs0FOVE4I nil/upF1FRrEoJHQ02kHSUjbdnJ6jF9uYzkfGo44Fn1bnrE4zUvC7uiTExVdhCiTORk6iT2x4oA4x 0mx3bWMvQsk9Y4oPg/xNzAQm2TNe+Qww3Ru7I+5lRF5GiT3HBY+IxHNudch/1HJszRUJpDDTtIpLE kkgk5+vPZ6/Hm3RGLuhVWNIGD85rb65f52nTTpHhTduPmO158R7n4Q0ozdA/eyyzf6mVMGLYRd++5 FancEe+U/sv+XeX1dX8lGckMVvhT3++eo6xBlNDlVIWEv8cRPREqou2Y2azMW3WWS6quuPmGSEOf6 GXhxs8SJTxtCroQMatkg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pIW6n-005O7O-D5; Thu, 19 Jan 2023 14:41:41 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pIW2n-005M6K-AS for linux-riscv@lists.infradead.org; Thu, 19 Jan 2023 14:37:38 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1674139052; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QbSxuBYwyBhZhp7hgOeOy88U7e5YyI7vjVO9jj/5+zE=; b=b6bO/fqSO+Sm2GzTC3GvwCy0zhRsXptkxW5pCovs0qJ6yPdGVQyS7YH60j6LgiKXVJPdiY U4jXfw5LlwIkjw4B2ZFov9P3Auc2v4C6oDF+OKGpuYusc3ruyVIgyL+qM7zY6oH5HAjurr 3TWWky3ky6v8gejQUz3ELVnD411zOyA= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-567-l4TS9XtFOxaf2EwwHWgw-g-1; Thu, 19 Jan 2023 09:37:29 -0500 X-MC-Unique: l4TS9XtFOxaf2EwwHWgw-g-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 07306857A88; Thu, 19 Jan 2023 14:37:27 +0000 (UTC) Received: from vschneid.remote.csb (unknown [10.33.36.13]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 9C6872026D68; Thu, 19 Jan 2023 14:37:22 +0000 (UTC) From: Valentin Schneider To: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, x86@kernel.org Cc: "Paul E. McKenney" , Steven Rostedt , Peter Zijlstra , Thomas Gleixner , Sebastian Andrzej Siewior , Juri Lelli , Daniel Bristot de Oliveira , Marcelo Tosatti , Frederic Weisbecker , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Marc Zyngier , Mark Rutland , Russell King , Nicholas Piggin , Guo Ren , "David S. Miller" Subject: [PATCH v4 6/7] smp: reword smp call IPI comment Date: Thu, 19 Jan 2023 14:36:18 +0000 Message-Id: <20230119143619.2733236-7-vschneid@redhat.com> In-Reply-To: <20230119143619.2733236-1-vschneid@redhat.com> References: <20230119143619.2733236-1-vschneid@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230119_063733_498518_88E9FD22 X-CRM114-Status: GOOD ( 16.90 ) 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 Accessing the call_single_queue hasn't involved a spinlock since 2014: 6897fc22ea01 ("kernel: use lockless list for smp_call_function_single") The llist operations (namely cmpxchg() and xchg()) provide similar ordering guarantees, update the comment to lessen confusion. Signed-off-by: Valentin Schneider --- kernel/smp.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/smp.c b/kernel/smp.c index 93b4386cd3096..821b5986721ac 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -495,9 +495,10 @@ void __smp_call_single_queue(int cpu, struct llist_node *node) #endif /* - * The list addition should be visible before sending the IPI - * handler locks the list to pull the entry off it because of - * normal cache coherency rules implied by spinlocks. + * The list addition should be visible to the target CPU when it pops + * the head of the list to pull the entry off it in the IPI handler + * because of normal cache coherency rules implied by the underlying + * llist ops. * * If IPIs can go out of order to the cache coherency protocol * in an architecture, sufficient synchronisation should be added