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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 S966454AbeCSQMW (ORCPT ); Mon, 19 Mar 2018 12:12:22 -0400 Received: from mail-co1nam03on0099.outbound.protection.outlook.com ([104.47.40.99]:8096 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S966811AbeCSQMS (ORCPT ); Mon, 19 Mar 2018 12:12:18 -0400 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Michael Ellerman , Sasha Levin Subject: [PATCH AUTOSEL for 3.18 035/102] selftests/powerpc: Fix TM resched DSCR test with some compilers Thread-Topic: [PATCH AUTOSEL for 3.18 035/102] selftests/powerpc: Fix TM resched DSCR test with some compilers Thread-Index: AQHTv50KshGFcOxyB0qVhdt05UTQ9Q== Date: Mon, 19 Mar 2018 16:12:16 +0000 Message-ID: <20180319161117.17833-35-alexander.levin@microsoft.com> References: <20180319161117.17833-1-alexander.levin@microsoft.com> In-Reply-To: <20180319161117.17833-1-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;DM5PR2101MB1014;7:b2/sEMpO2o04egQk6KVqu3VDgqXk/+NCEhLtrRYfy8xLyQhZo7juCLstrfgRJkP6ANgLL7Jf7YiEOPLWQqPyI4hPHjJFMFrWrlJy7dENdIHcNKFcsiNXX2elKY1QPhOKznLA7ruVVPSQ8EiMrB6uFQXX+dXeIVEHCLg9i80IbBteKTe1XsIeowQ0DVv1YL9ba3aL087wqvvOnKysgRrUy/k5bCDp3o+nCunvYga0vdHp4OuPaNaulDtbMEaAhRlf;20:LvV4FrVniiigEMDzhd8sc77vuOOyWl2geUrL2gjOSks0BjYfUtQvWZA1rNDlfvZHiOK9JbDNzoU4i39ObSAwD5am9GOAq4zEbKvHjiwNSbitykWYcrHIAS4aeY0QOOBwzRG/JNkgrxjd5pAfohnjjBbDv2mefOgIjpqLzfSfZ3I= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 61896bd5-ad05-4f1a-dc91-08d58db42f5b x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1014; 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x-microsoft-antispam-message-info: U64bHWcOpikk45RF4OZNJowOFDwW0jhZstZMekG2E1q4QxXNKwT+2ZWGnObLw3vSUheo26DZTT1XWKpeu7QeA4fBid1K2vG2VHJ6L45574L0leElP4i8QFOtFQ5kMfXBhnCXC3aD32qmxyYhBIQtq0fiS7YYVk7UOLr7hRqf410vIcbZRDzbqkYcwC0q9TotpIx/6el6LMx29iDxPDzwWOi50VHiSthuQeHMiAlOzNuXShKNqXuBIyRRv08bKQrSZ9V4dtxK7TbPFxEENLYa7IB7Z/luWrLhFcfayML+odYz6DGq2pWdaBFjyupcXTjAvwR7iHL3svTChqcfsEhpUg== 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: 61896bd5-ad05-4f1a-dc91-08d58db42f5b X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2018 16:12:16.3727 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1014 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 42d4c8caad81..de8dc82e2567 100644 --- a/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c +++ b/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c @@ -45,12 +45,12 @@ 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