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Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gMRdO-0000xk-Cj for linux-um@lists.infradead.org; Tue, 13 Nov 2018 05:53:11 +0000 Received: from sasha-vm.mshome.net (unknown [64.114.255.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 659CF223CB; Tue, 13 Nov 2018 05:52:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1542088379; bh=RqwcYhb1+j1X6v4PhxA38M5z4ClrUxmTG33gXPfdeFc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RpfArkXMqhcpbB6ZgdVQ6puXDmINC5JfpzXK7R5acHkMyCYwiLnbHjEgjwAd8Kx1U xHBCHmCoPbf0zGZuJRFG8HgzWAAOrhmC1kwyP3KBiot9izYSRskdmq6HcGtubOe2Ua gSRFBaxcnEny6vYsTPRCUX1KdmiR25zvFO315kd4= From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH AUTOSEL 3.18 5/9] um: Give start_idle_thread() a return code Date: Tue, 13 Nov 2018 00:52:48 -0500 Message-Id: <20181113055252.79406-5-sashal@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181113055252.79406-1-sashal@kernel.org> References: <20181113055252.79406-1-sashal@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181113_005310_521362_96BADF8A X-CRM114-Status: GOOD ( 10.83 ) X-Spam-Score: -5.8 (-----) X-Spam-Report: SpamAssassin version 3.4.2 on merlin.infradead.org summary: Content analysis details: (-5.8 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [198.145.29.99 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.6 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , Richard Weinberger , linux-um@lists.infradead.org MIME-Version: 1.0 Sender: "linux-um" Errors-To: linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org From: Richard Weinberger [ Upstream commit 7ff1e34bbdc15acab823b1ee4240e94623d50ee8 ] Fixes: arch/um/os-Linux/skas/process.c:613:1: warning: control reaches end of non-void function [-Wreturn-type] longjmp() never returns but gcc still warns that the end of the function can be reached. Add a return code and debug aid to detect this impossible case. Signed-off-by: Richard Weinberger Signed-off-by: Sasha Levin --- arch/um/os-Linux/skas/process.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c index 908579f2b0ab..258e741f61a8 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -694,6 +694,11 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf) fatal_sigsegv(); } longjmp(*switch_buf, 1); + + /* unreachable */ + printk(UM_KERN_ERR "impossible long jump!"); + fatal_sigsegv(); + return 0; } void initial_thread_cb_skas(void (*proc)(void *), void *arg)