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x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1032347AbeCSV17 (ORCPT ); Mon, 19 Mar 2018 17:27:59 -0400 Received: from mail-sn1nam02on0093.outbound.protection.outlook.com ([104.47.36.93]:41904 "EHLO NAM02-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S965236AbeCSQAK (ORCPT ); Mon, 19 Mar 2018 12:00:10 -0400 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Michael Ellerman , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 081/281] selftests/powerpc: Fix TM resched DSCR test with some compilers Thread-Topic: [PATCH AUTOSEL for 4.9 081/281] selftests/powerpc: Fix TM resched DSCR test with some compilers Thread-Index: AQHTv5tCQUd3AR8m106kAUCnb1Vqig== Date: Mon, 19 Mar 2018 15:59:28 +0000 Message-ID: <20180319155742.13731-81-alexander.levin@microsoft.com> References: <20180319155742.13731-1-alexander.levin@microsoft.com> In-Reply-To: <20180319155742.13731-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0984;7:6Q9WjXm8o9PkPUsylKRO1lZyvtmnnxFxySYG+HABMGhq7zFWI84xbw59cmr0ysuoBtOpjRzYLzrl1VPKAYwnQFctbiQp1XYLIQrgJVzOWMWOSsdmgGRPXuwoNUqpuofYpwuYS3ZTfijiMe0cx3vVcuxE2iBsfen+N5ZvA2zBSPful7yUr6K9j6pUKxhNR60gbQ1YH2czERqNbdJQNmyIaCveDAHY4EuWEodPC2l5vemEMp5xTCWdhRxVG9kUs+IN;20:WKJFaGAJ0MIT47BU/bJs7iNGWUw3J4myJe5uzNQ52hYMHEHlyeGUL3Ljbs/5JVbPXuFUWwUKMgNJ9tFko+/DEHNw0Yu7H+dGLBBkOD+vWb1ktp/XqiEOYQXf+vHICBanjCCD190v9U6O58SwOrVi5mccKoGBfYINpEfGlRtBsUM= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 4606b372-e0e7-41b9-a311-08d58db27acc x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0984; 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x-microsoft-antispam-message-info: f4T/ElumdmB95jIRPITMID5xcP5mmeiOjLVtqRitgma0iImy7ImyqOq7tnN2gkY2G28ZMLH65jqr3I6rjuRwpyS4QOk8cvA6qHeFPg7lqDZhKij4KaMnzymN0u8pu/9rBkR6V9/lF7oTBsXdMX6jQ+iSV6aU6ydoOKb6w1Z98eLocVG2LRzDIMPGT2mKhUzfXRon7k2Kp88Ubb3pcW6FDSz1aSuBUYTzK7439VI7pgHt1f9rneqIzMLPmpmGhwHA+Bp6NtlXIGSXP6f8K96SLaqcB7/g9x34svTv7nOqmVAeizN+f+wdU2z36kcZY8Sbc7YmTD5r2xIufdNFYCKNQQ== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 4606b372-e0e7-41b9-a311-08d58db27acc X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2018 15:59:28.1645 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0984 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Michael Ellerman [ Upstream commit fe06fe860250a4f01d0eaf70a2563b1997174a74 ] The tm-resched-dscr test has started failing sometimes, depending on what compiler it's built with, eg: test: tm_resched_dscr Check DSCR TM context switch: tm-resched-dscr: tm-resched-dscr.c:76: test= _body: Assertion `rv' failed. !! child died by signal 6 When it fails we see that the compiler doesn't initialise rv to 1 before entering the inline asm block. Although that's counter intuitive, it is allowed because we tell the compiler that the inline asm will write to rv (using "=3Dr"), meaning the original value is irrelevant. Marking it as a read/write parameter would presumably work, but it seems simpler to fix it by setting the initial value of rv in the inline asm. Fixes: 96d016108640 ("powerpc: Correct DSCR during TM context switch") Signed-off-by: Michael Ellerman Acked-by: Michael Neuling Signed-off-by: Sasha Levin --- tools/testing/selftests/powerpc/tm/tm-resched-dscr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c b/tools/t= esting/selftests/powerpc/tm/tm-resched-dscr.c index d9c49f41515e..e79ccd6aada1 100644 --- a/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c +++ b/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c @@ -42,12 +42,12 @@ int test_body(void) printf("Check DSCR TM context switch: "); fflush(stdout); for (;;) { - rv =3D 1; asm __volatile__ ( /* set a known value into the DSCR */ "ld 3, %[dscr1];" "mtspr %[sprn_dscr], 3;" =20 + "li %[rv], 1;" /* start and suspend a transaction */ "tbegin.;" "beq 1f;" --=20 2.14.1