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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5271FC433FE for ; Wed, 27 Oct 2021 21:18:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4037B610CF for ; Wed, 27 Oct 2021 21:18:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244514AbhJ0VVC (ORCPT ); Wed, 27 Oct 2021 17:21:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53750 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244303AbhJ0VU3 (ORCPT ); Wed, 27 Oct 2021 17:20:29 -0400 Received: from mail-lf1-x132.google.com (mail-lf1-x132.google.com [IPv6:2a00:1450:4864:20::132]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A620EC061745; Wed, 27 Oct 2021 14:18:03 -0700 (PDT) Received: by mail-lf1-x132.google.com with SMTP id f3so803531lfu.12; Wed, 27 Oct 2021 14:18:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=O+IvQoJf2OjzCPAk90L+IlIvsTQGqRsS8A3mVG9thss=; b=BbS8+/zxVJ00rr3ixtYTd3bTdxqjkUjnBr55DaOxzJArvyNX4521PAqPigYX/BjB1N aGylVDFiYrs5wRaWuZx6L52it/PPywema7yDnahBHenwiuFnc4S3m//ivsOGtXuUlPNB ubXOhenNVEu1KXB2mXMptIWVwaeJRf3hxW3c8R68HPPg3pjoH3MM7xhUxuphpty83aFx DGHamMHIXY7/zgP3wsKkRhZ7yEHgmahY/byikn8BiZjEw2DWUQkjcB5nYo+Xgh+eH8p4 oVpJycq4ZWi1GYj36y1/HBYlXfcjUxN5WpbpwFTT0cF/PRko7dGul5P66XpFeKCAINSY 8XVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=O+IvQoJf2OjzCPAk90L+IlIvsTQGqRsS8A3mVG9thss=; b=U20ivDQwPCbYsfj9u1nt9yIAxHAUWd6+0MZj+RkD5Boi8OC550GbYlsfggopQApCSp 80adqRwpYlNOasBV1fAZz1aoHxwhedMwfPeAz+AtlFstVXuhbkux/WUwZjdx8e0cSI/p z1YrRq92yc2QPScqgx47eI6VndxMrHiC9buop91TsmFTki7LsAoTBGx7g0vV76kqg++E 6/JkYZufSbAnH1xIWOogGUB5N6Nylfnc6pEn2qtlf8NQ/3NDvix6DMnSK3rkN7AqSduV qWVCc/+1qaMEB/5GnspLAnNQxFF0kGlRbo+bAj1R7nExDZ88ejRE/5wlmYxUNZTt3GvG yotg== X-Gm-Message-State: AOAM533O7w1dYBuMoH7+TOfmWWCMiLEUs+qr9hoSGpN9oaS54OywWVS1 IQbrX/GPUFpjLI+Jb6aT1i0= X-Google-Smtp-Source: ABdhPJxyJaCNELbykyJ8mI+u0lU4wtjMFWua0Lm4EEmjlSiKb32hiTjDEQ+OHhGC/feOlGuy6qCfSA== X-Received: by 2002:ac2:4285:: with SMTP id m5mr140041lfh.86.1635369481970; Wed, 27 Oct 2021 14:18:01 -0700 (PDT) Received: from localhost.localdomain (46-138-41-28.dynamic.spd-mgts.ru. [46.138.41.28]) by smtp.gmail.com with ESMTPSA id d7sm104336ljl.18.2021.10.27.14.18.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Oct 2021 14:18:01 -0700 (PDT) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Lee Jones , "Rafael J . Wysocki" , Mark Brown , Andrew Morton , Guenter Roeck , Russell King , Daniel Lezcano , Andy Shevchenko , Ulf Hansson Cc: Catalin Marinas , Will Deacon , Guo Ren , Geert Uytterhoeven , Greg Ungerer , Joshua Thompson , Thomas Bogendoerfer , Nick Hu , Greentime Hu , Vincent Chen , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Paul Walmsley , Palmer Dabbelt , Albert Ou , Yoshinori Sato , Rich Felker , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Boris Ostrovsky , Juergen Gross , Stefano Stabellini , Len Brown , Santosh Shilimkar , Krzysztof Kozlowski , Linus Walleij , Chen-Yu Tsai , =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= , Tony Lindgren , Liam Girdwood , Philipp Zabel , Vladimir Zapolskiy , Avi Fishman , Tomer Maimon , Tali Perry , Patrick Venture , Nancy Yuen , Benjamin Fair , Pavel Machek , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org, linux-omap@vger.kernel.org, openbmc@lists.ozlabs.org, linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v2 05/45] reboot: Warn if restart handler has duplicated priority Date: Thu, 28 Oct 2021 00:16:35 +0300 Message-Id: <20211027211715.12671-6-digetx@gmail.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211027211715.12671-1-digetx@gmail.com> References: <20211027211715.12671-1-digetx@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Add sanity check which ensures that there are no two restart handlers registered with the same priority. Normally it's a direct sign of a problem if two handlers use the same priority. Signed-off-by: Dmitry Osipenko --- kernel/reboot.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/kernel/reboot.c b/kernel/reboot.c index efb40d095d1e..d39e599c3c99 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -182,7 +182,20 @@ static ATOMIC_NOTIFIER_HEAD(restart_handler_list); */ int register_restart_handler(struct notifier_block *nb) { - return atomic_notifier_chain_register(&restart_handler_list, nb); + int ret; + + ret = atomic_notifier_chain_register(&restart_handler_list, nb); + if (ret) + return ret; + + /* + * Handler must have unique priority. Otherwise invocation order is + * determined by the registration order, which is presumed to be + * unreliable. + */ + WARN_ON(!atomic_notifier_has_unique_priority(&restart_handler_list, nb)); + + return 0; } EXPORT_SYMBOL(register_restart_handler); -- 2.33.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Osipenko Date: Wed, 27 Oct 2021 21:16:35 +0000 Subject: [PATCH v2 05/45] reboot: Warn if restart handler has duplicated priority Message-Id: <20211027211715.12671-6-digetx@gmail.com> List-Id: References: <20211027211715.12671-1-digetx@gmail.com> In-Reply-To: <20211027211715.12671-1-digetx@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Thierry Reding , Jonathan Hunter , Lee Jones , "Rafael J . Wysocki" , Mark Brown , Andrew Morton , Guenter Roeck , Russell King , Daniel Lezcano , Andy Shevchenko , Ulf Hansson Cc: Catalin Marinas , Will Deacon , Guo Ren , Geert Uytterhoeven , Greg Ungerer , Joshua Thompson , Thomas Bogendoerfer , Nick Hu , Greentime Hu , Vincent Chen , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Paul Walmsley , Palmer Dabbelt , Albert Ou , Yoshinori Sato , Rich Felker , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Boris Ostrovsky , Juergen Gross , Stefano Stabellini , Len Brown , Santosh Shilimkar , Krzysztof Kozlowski , Linus Walleij , Chen-Yu Tsai , =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= , Tony Lindgren , Liam Girdwood , Philipp Zabel , Vladimir Zapolskiy , Avi Fishman , Tomer Maimon , Tali Perry , Patrick Venture , Nancy Yuen , Benjamin Fair , Pavel Machek , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org, linux-omap@vger.kernel.org, openbmc@lists.ozlabs.org, linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org Add sanity check which ensures that there are no two restart handlers registered with the same priority. Normally it's a direct sign of a problem if two handlers use the same priority. Signed-off-by: Dmitry Osipenko --- kernel/reboot.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/kernel/reboot.c b/kernel/reboot.c index efb40d095d1e..d39e599c3c99 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -182,7 +182,20 @@ static ATOMIC_NOTIFIER_HEAD(restart_handler_list); */ int register_restart_handler(struct notifier_block *nb) { - return atomic_notifier_chain_register(&restart_handler_list, nb); + int ret; + + ret = atomic_notifier_chain_register(&restart_handler_list, nb); + if (ret) + return ret; + + /* + * Handler must have unique priority. Otherwise invocation order is + * determined by the registration order, which is presumed to be + * unreliable. + */ + WARN_ON(!atomic_notifier_has_unique_priority(&restart_handler_list, nb)); + + return 0; } EXPORT_SYMBOL(register_restart_handler); -- 2.33.1 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 84FDDC433FE for ; Wed, 27 Oct 2021 21:18:24 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 42067610CA for ; Wed, 27 Oct 2021 21:18:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 42067610CA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org 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=Z7mgJuhdmzD4HJZ4LfWC+tW/FwOpT9ig8xyGPXySlhc=; b=AJiS7QodzWFwhr +1vr7vXhd78bYtux/9c9CeqLdBCV1GOWLzCHs+H6TOq0yBfuQWovfTHfk3jlSTaRVbtg1X7NBGn4P YK7rJRHwFIsS9LiBp++fSlgpeFEyB1bNLvTtXsWRGL1QhJQ6L9Vl1dDWboLLxt64CWbvPzSgGZP/z FQ8ZMcAaI0mjT1ru++ZAPgDhZL7b+1LZl6B+IF2NIHx51g5yketOh62ySBjQMACACBlIsnELTe//4 Jp+fyMhzCdm4yMiFXvAe5Ubp9JUeuZ3WCF23fNlUawGGgNT+byhhSQP6Nz4tcQBsz2kzMAks0IiLS gCMMeyeDYul0KGx4jyGw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mfqJM-006AVS-QN; Wed, 27 Oct 2021 21:18:16 +0000 Received: from mail-lf1-x12d.google.com ([2a00:1450:4864:20::12d]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mfqJA-006ALk-1d; Wed, 27 Oct 2021 21:18:05 +0000 Received: by mail-lf1-x12d.google.com with SMTP id j9so8976649lfu.7; Wed, 27 Oct 2021 14:18:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=O+IvQoJf2OjzCPAk90L+IlIvsTQGqRsS8A3mVG9thss=; b=BbS8+/zxVJ00rr3ixtYTd3bTdxqjkUjnBr55DaOxzJArvyNX4521PAqPigYX/BjB1N aGylVDFiYrs5wRaWuZx6L52it/PPywema7yDnahBHenwiuFnc4S3m//ivsOGtXuUlPNB ubXOhenNVEu1KXB2mXMptIWVwaeJRf3hxW3c8R68HPPg3pjoH3MM7xhUxuphpty83aFx DGHamMHIXY7/zgP3wsKkRhZ7yEHgmahY/byikn8BiZjEw2DWUQkjcB5nYo+Xgh+eH8p4 oVpJycq4ZWi1GYj36y1/HBYlXfcjUxN5WpbpwFTT0cF/PRko7dGul5P66XpFeKCAINSY 8XVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=O+IvQoJf2OjzCPAk90L+IlIvsTQGqRsS8A3mVG9thss=; b=03mDcLkM+SSZl1EmUzMWklI2e9E6A8bGVUtmEdrvo9Ldk6deFdEvysu7MmrF9LzR8+ FgsN+KLpqbXYR0iODuogq+w6IUQ53hi36cHvtUyq6jKE2+pltz4O/Ksg2orQ36juVWmV p712NH+LMchwx0HCY2gov7ymdDX91zprj7O0aodJTg1rm2rPkh/VCXYo3mqlgF7Vs3KG Fflr6c4MMxocTPx8iQ/fARMqbEC7Y9eh6jnJ4HJw13c2nfQGwpheFTFmkpPy86PQ1Lrn NUgmmTRL5SMfSFqEAi1Gsy8gOI31mbvfZ8J8ijC+yPwTrFMmtohmvf/M9cv8Yiou3c9A 0YiA== X-Gm-Message-State: AOAM53155v5C40gMox+Mn0dCS71m8qb15kZki9bkz+di8HS8XYzTmoUX mooDKykpLpLxG1TEPWF9RZk= X-Google-Smtp-Source: ABdhPJxyJaCNELbykyJ8mI+u0lU4wtjMFWua0Lm4EEmjlSiKb32hiTjDEQ+OHhGC/feOlGuy6qCfSA== X-Received: by 2002:ac2:4285:: with SMTP id m5mr140041lfh.86.1635369481970; Wed, 27 Oct 2021 14:18:01 -0700 (PDT) Received: from localhost.localdomain (46-138-41-28.dynamic.spd-mgts.ru. [46.138.41.28]) by smtp.gmail.com with ESMTPSA id d7sm104336ljl.18.2021.10.27.14.18.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Oct 2021 14:18:01 -0700 (PDT) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Lee Jones , "Rafael J . Wysocki" , Mark Brown , Andrew Morton , Guenter Roeck , Russell King , Daniel Lezcano , Andy Shevchenko , Ulf Hansson Cc: Catalin Marinas , Will Deacon , Guo Ren , Geert Uytterhoeven , Greg Ungerer , Joshua Thompson , Thomas Bogendoerfer , Nick Hu , Greentime Hu , Vincent Chen , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Paul Walmsley , Palmer Dabbelt , Albert Ou , Yoshinori Sato , Rich Felker , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Boris Ostrovsky , Juergen Gross , Stefano Stabellini , Len Brown , Santosh Shilimkar , Krzysztof Kozlowski , Linus Walleij , Chen-Yu Tsai , =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= , Tony Lindgren , Liam Girdwood , Philipp Zabel , Vladimir Zapolskiy , Avi Fishman , Tomer Maimon , Tali Perry , Patrick Venture , Nancy Yuen , Benjamin Fair , Pavel Machek , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org, linux-omap@vger.kernel.org, openbmc@lists.ozlabs.org, linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v2 05/45] reboot: Warn if restart handler has duplicated priority Date: Thu, 28 Oct 2021 00:16:35 +0300 Message-Id: <20211027211715.12671-6-digetx@gmail.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211027211715.12671-1-digetx@gmail.com> References: <20211027211715.12671-1-digetx@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211027_141804_123919_9AF161E0 X-CRM114-Status: GOOD ( 16.64 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Add sanity check which ensures that there are no two restart handlers registered with the same priority. Normally it's a direct sign of a problem if two handlers use the same priority. Signed-off-by: Dmitry Osipenko --- kernel/reboot.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/kernel/reboot.c b/kernel/reboot.c index efb40d095d1e..d39e599c3c99 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -182,7 +182,20 @@ static ATOMIC_NOTIFIER_HEAD(restart_handler_list); */ int register_restart_handler(struct notifier_block *nb) { - return atomic_notifier_chain_register(&restart_handler_list, nb); + int ret; + + ret = atomic_notifier_chain_register(&restart_handler_list, nb); + if (ret) + return ret; + + /* + * Handler must have unique priority. Otherwise invocation order is + * determined by the registration order, which is presumed to be + * unreliable. + */ + WARN_ON(!atomic_notifier_has_unique_priority(&restart_handler_list, nb)); + + return 0; } EXPORT_SYMBOL(register_restart_handler); -- 2.33.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6C2CDC433F5 for ; Wed, 27 Oct 2021 22:55:17 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C318F60F92 for ; Wed, 27 Oct 2021 22:55:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org C318F60F92 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4HfkYH3MM3z3dlh for ; Thu, 28 Oct 2021 09:55:15 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20210112 header.b=BbS8+/zx; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com (client-ip=2a00:1450:4864:20::134; helo=mail-lf1-x134.google.com; envelope-from=digetx@gmail.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20210112 header.b=BbS8+/zx; dkim-atps=neutral Received: from mail-lf1-x134.google.com (mail-lf1-x134.google.com [IPv6:2a00:1450:4864:20::134]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4HfhP90mNMz2xXs; Thu, 28 Oct 2021 08:18:05 +1100 (AEDT) Received: by mail-lf1-x134.google.com with SMTP id bi35so8956098lfb.9; Wed, 27 Oct 2021 14:18:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=O+IvQoJf2OjzCPAk90L+IlIvsTQGqRsS8A3mVG9thss=; b=BbS8+/zxVJ00rr3ixtYTd3bTdxqjkUjnBr55DaOxzJArvyNX4521PAqPigYX/BjB1N aGylVDFiYrs5wRaWuZx6L52it/PPywema7yDnahBHenwiuFnc4S3m//ivsOGtXuUlPNB ubXOhenNVEu1KXB2mXMptIWVwaeJRf3hxW3c8R68HPPg3pjoH3MM7xhUxuphpty83aFx DGHamMHIXY7/zgP3wsKkRhZ7yEHgmahY/byikn8BiZjEw2DWUQkjcB5nYo+Xgh+eH8p4 oVpJycq4ZWi1GYj36y1/HBYlXfcjUxN5WpbpwFTT0cF/PRko7dGul5P66XpFeKCAINSY 8XVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=O+IvQoJf2OjzCPAk90L+IlIvsTQGqRsS8A3mVG9thss=; b=hbxORGkR5dsSPISY5QH8p9HcFT+sqqHsvxTsvxODXzyFSrehJRvQFuKdsU1DBm3Zng gyeHxzaanEv9vHFTe8H3Q7hoXUeM58UD9sDQDMOi7kGaMR2hcFRpmV3Wi+MifDP57O49 BYJewx5kUO2OIIF5UGIshtW6hSylE7mpcIeDnkCplqiCaJI12h1jHHzLbTkArbc45rW9 LeB2YgoGCQxBDMLJQj+J6Kj765rxeBFO0y7fh4VQ8Z6nDKxZZWwQMQmx6WAb1hydWdNY C1sgk3HqD6dntw8SYHelg8l9I3gVo7a7EW8Cz5HVg/aUEbrLCNPvlvQQRZjzez9vt2/I CiLg== X-Gm-Message-State: AOAM5329+MO030bQgwyKQPMx5vj1D3z+8QnVXEdoZKj6+RtE6eHOtvW0 HQzRi1ElDR5MjDD/OQupxSA= X-Google-Smtp-Source: ABdhPJxyJaCNELbykyJ8mI+u0lU4wtjMFWua0Lm4EEmjlSiKb32hiTjDEQ+OHhGC/feOlGuy6qCfSA== X-Received: by 2002:ac2:4285:: with SMTP id m5mr140041lfh.86.1635369481970; Wed, 27 Oct 2021 14:18:01 -0700 (PDT) Received: from localhost.localdomain (46-138-41-28.dynamic.spd-mgts.ru. [46.138.41.28]) by smtp.gmail.com with ESMTPSA id d7sm104336ljl.18.2021.10.27.14.18.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Oct 2021 14:18:01 -0700 (PDT) From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Lee Jones , "Rafael J . Wysocki" , Mark Brown , Andrew Morton , Guenter Roeck , Russell King , Daniel Lezcano , Andy Shevchenko , Ulf Hansson Subject: [PATCH v2 05/45] reboot: Warn if restart handler has duplicated priority Date: Thu, 28 Oct 2021 00:16:35 +0300 Message-Id: <20211027211715.12671-6-digetx@gmail.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211027211715.12671-1-digetx@gmail.com> References: <20211027211715.12671-1-digetx@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Thu, 28 Oct 2021 09:51:48 +1100 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rich Felker , linux-ia64@vger.kernel.org, Tomer Maimon , Santosh Shilimkar , linux-sh@vger.kernel.org, Boris Ostrovsky , Linus Walleij , Dave Hansen , linux-acpi@vger.kernel.org, Tali Perry , "James E.J. Bottomley" , Paul Mackerras , Pavel Machek , "H. Peter Anvin" , linux-riscv@lists.infradead.org, Vincent Chen , Will Deacon , Greg Ungerer , Stefano Stabellini , Benjamin Fair , Yoshinori Sato , Krzysztof Kozlowski , Helge Deller , x86@kernel.org, linux-csky@vger.kernel.org, Tony Lindgren , Chen-Yu Tsai , Ingo Molnar , Geert Uytterhoeven , Catalin Marinas , xen-devel@lists.xenproject.org, linux-mips@vger.kernel.org, Len Brown , Albert Ou , linux-pm@vger.kernel.org, =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= , Vladimir Zapolskiy , linux-m68k@lists.linux-m68k.org, Borislav Petkov , Greentime Hu , Paul Walmsley , linux-tegra@vger.kernel.org, Thomas Gleixner , linux-omap@vger.kernel.org, Nancy Yuen , linux-arm-kernel@lists.infradead.org, Juergen Gross , Thomas Bogendoerfer , linux-parisc@vger.kernel.org, Nick Hu , Avi Fishman , Patrick Venture , Liam Girdwood , linux-kernel@vger.kernel.org, Palmer Dabbelt , Philipp Zabel , Guo Ren , linuxppc-dev@lists.ozlabs.org, openbmc@lists.ozlabs.org, Joshua Thompson Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Add sanity check which ensures that there are no two restart handlers registered with the same priority. Normally it's a direct sign of a problem if two handlers use the same priority. Signed-off-by: Dmitry Osipenko --- kernel/reboot.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/kernel/reboot.c b/kernel/reboot.c index efb40d095d1e..d39e599c3c99 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -182,7 +182,20 @@ static ATOMIC_NOTIFIER_HEAD(restart_handler_list); */ int register_restart_handler(struct notifier_block *nb) { - return atomic_notifier_chain_register(&restart_handler_list, nb); + int ret; + + ret = atomic_notifier_chain_register(&restart_handler_list, nb); + if (ret) + return ret; + + /* + * Handler must have unique priority. Otherwise invocation order is + * determined by the registration order, which is presumed to be + * unreliable. + */ + WARN_ON(!atomic_notifier_has_unique_priority(&restart_handler_list, nb)); + + return 0; } EXPORT_SYMBOL(register_restart_handler); -- 2.33.1