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[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) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 2e7b98de-8165-4f45-971f-8de142cf3589 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=UrfxMbjD6aQoXDBgVtOUbnWc7vAvnH2w3/rUs7LcfMphW1ZXGXJyq9lh1MVz6uVbqk SGlM5lcxzse7UHKOMm1smaDj1Mmy0ii9G+lGn3AcanYrIEwnI+Dx4DL3ec3JfKiuGThH dFdt+0Syw8B2psNEoijmQwaXBomClChOXwE/vbU8k2Zz/ZMOLo4uQ71HM0DwbTwTlkls nd1hH9CoAST9DZT0M+0DLvJmmPNlPndJWSwj9L+rWm/zBJ+mddO9vjXWbmV4rXx8DLXH 7c1EmoE/gRR9iaZ8M7Nu6sCUIE99+CVu7luE27o6kuFUtRCUsUdu950raQWn/TMZWWGK 2hLQ== X-Gm-Message-State: AOAM531ZoPascVNJv1Xnz4IO88Octe6frNZVLO+3PmAk/2JUHFPWsjyw 3nGTLCCQPJFVES/oEGPZAOo= 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) 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_Neusch=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 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);