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 B45C1C433EF for ; Tue, 22 Mar 2022 09:36:46 +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:Cc:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cZ4PxN3fWaeiMBln+L/9vIfzmqpkBMu1JgTURBdhkA4=; b=N7WsDuQOBuKH1f uXgZcevXSo02q/f88UGq1XDtPmq0SQ2cz7av4F9kzITqWstu8k6lma7vbM88aVD+KuCSY2zg+Ven9 eiNGTee+r6yOa2PaMqd2XWfHK84qTWLFgvTjDgMw1DPQRfUPeBkHSO7+hqYZ5/GNcxvn3f9MBf5+q nXOYqPH9xS2RL22tDWbEPkXOujd4+GTD+ubKHWDjVuCgVYRBq+qspwQ3SoJxT2gIzaPoF8xTLxhFK 63fDJgT5lIWAhJ5vt4Egs2YUwIAOLRVscYnI3YbCVdZIH+yEFhJOTsmQThS682NCk0eZlyS8AXKz4 ugfLzyy0ahFjwRnDYRtA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nWavS-00Ac2h-CW; Tue, 22 Mar 2022 09:35:38 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nWavO-00Ac2B-JF for linux-arm-kernel@lists.infradead.org; Tue, 22 Mar 2022 09:35:35 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 8CB1FB81C56 for ; Tue, 22 Mar 2022 09:35:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C1647C340FA for ; Tue, 22 Mar 2022 09:35:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1647941730; bh=Zts/gyl/tv/2FnJfL8+1xjKBan2CCFCPjLXX71f7auI=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=RQPUEiQK5WT5wKjLaG0fRKXWv2npSxHeIFCaJvvQtzh5guRdgLHnnOi4qzygJ+8bq xD394f7IkpvGNvSWATUGvND7jJUxTz3Qdf/+gZG92migja+AGkIrX1tqszJ+rviyK5 7hcHSFXeBpUXxHbLCSxktFE9hEURlF777Nn7jARP0U1VrZtoGWgJGzkcrzhqXrhXXA iufi5o1EG5M2SrsTNfIHi2fM8xHlHctfBq3qFvh5VdyKytM/kBZ3OOb+xb1i//NvuY Cd/sK6d56/PIol67dC8cCEgQbQ7jlJQLtdK79fJ76f0R23kV4dTGDDOflqOX6nTZr+ ujsHSw+2dTE9g== Received: by mail-yw1-f182.google.com with SMTP id 00721157ae682-2e5e31c34bfso104472087b3.10 for ; Tue, 22 Mar 2022 02:35:30 -0700 (PDT) X-Gm-Message-State: AOAM5321WeIMgCY1nVKZwRjnLuEtQrT+HBPosBayktMU39AZTIIt3Pqc hFsrcCgt8aDllrpwfXGZuoeo5EHhTH9zBIl4jUs= X-Google-Smtp-Source: ABdhPJz/la3PKtOMHD6S288/kvu6qbT90/pI1k7Mc/hxLdCzLhVyqUiBEXsN39195aDZKWbqQglgHgLGWWdZ2AxlUMc= X-Received: by 2002:a81:10c2:0:b0:2e5:c9dd:d5bf with SMTP id 185-20020a8110c2000000b002e5c9ddd5bfmr24018648ywq.342.1647941729701; Tue, 22 Mar 2022 02:35:29 -0700 (PDT) MIME-Version: 1.0 References: <20220124174744.1054712-1-ardb@kernel.org> <20220124174744.1054712-25-ardb@kernel.org> In-Reply-To: From: Ard Biesheuvel Date: Tue, 22 Mar 2022 10:35:18 +0100 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v5 24/32] ARM: run softirqs on the per-CPU IRQ stack To: Sebastian Andrzej Siewior Cc: Russell King , Linux ARM , linux-hardening@vger.kernel.org, Nicolas Pitre , Arnd Bergmann , Kees Cook , Keith Packard , Linus Walleij , Nick Desaulniers , Tony Lindgren , Marc Zyngier , Vladimir Murzin , Jesse Taube , Thomas Gleixner X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220322_023534_816690_F5824F6E X-CRM114-Status: GOOD ( 18.26 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, 22 Mar 2022 at 10:04, Sebastian Andrzej Siewior wrote: > > On 2022-01-24 18:47:36 [+0100], Ard Biesheuvel wrote: > > @@ -58,6 +61,17 @@ static void __init init_irq_stacks(void) > > } > > } > > > > +static void ____do_softirq(void *arg) > > +{ > > + __do_softirq(); > > +} > > + > > +void do_softirq_own_stack(void) > > +{ > > + call_with_stack(____do_softirq, NULL, > > + __this_cpu_read(irq_stack_ptr)); > > +} > > + > > Do I miss the obvious here or is the irq_stack_ptr only used for > softirqs and not for hardirqs? > > > int arch_show_interrupts(struct seq_file *p, int prec) > > { > > #ifdef CONFIG_FIQ > It is also used for hard IRQs - please refer to the irq_handler macro in arch/arm/kernel/entry-armv.S _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel