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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:49608) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1l1X4a-0006ew-7i; Mon, 18 Jan 2021 16:08:08 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1l1X4Z-00047y-OZ; Mon, 18 Jan 2021 16:08:07 +0000 Date: Mon, 18 Jan 2021 16:08:07 +0000 From: Russell King - ARM Linux admin To: Manivannan Sadhasivam Subject: Re: [PATCH] ARM: kernel: Fix interrupted SMC calls Message-ID: <20210118160807.GF1551@shell.armlinux.org.uk> References: <20210118155153.21520-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210118155153.21520-1-manivannan.sadhasivam@linaro.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210118_111112_871937_CBEC7093 X-CRM114-Status: GOOD ( 10.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-msm@vger.kernel.org, will@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, bjorn.andersson@linaro.org 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 Mon, Jan 18, 2021 at 09:21:53PM +0530, Manivannan Sadhasivam wrote: > @@ -27,10 +29,18 @@ UNWIND( .fnstart) > UNWIND( .save {r4-r7}) > ldm r12, {r4-r7} > \instr > + mov r9, r6 // Copy r6 before popping from stack > pop {r4-r7} > ldr r12, [sp, #(4 * 4)] > stm r12, {r0-r3} > - bx lr > + ldr r10, [sp, #20] > + cmp r10, #0 > + beq 1f // No quirk structure > + ldr r11, [r10, #ARM_SMCCC_QUIRK_ID_OFFS] > + cmp r11, #ARM_SMCCC_QUIRK_QCOM_A6 > + bne 1f // No quirk present > + str r9, [r10, #ARM_SMCCC_QUIRK_STATE_OFFS] > +1: bx lr NAK. This patch shows little regard for the C ABI. You are corrupting registers that must be preserved. Please find out about the C ABIs that are used on ARM. Thanks. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel