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Wed, 9 Jan 2019 23:16:25 +0000 From: Paul Burton To: "linux-kbuild@vger.kernel.org" CC: "linux-mips@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Paul Burton , Geert Uytterhoeven , Masahiro Yamada , Nicholas Piggin , "stable@vger.kernel.org" Subject: [PATCH] kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7 Thread-Topic: [PATCH] kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7 Thread-Index: AQHUqHFXHrragMJ1IkS80PCtgAJbBg== Date: Wed, 9 Jan 2019 23:16:25 +0000 Message-ID: <20190109231539.24613-1-paul.burton@mips.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BYAPR02CA0072.namprd02.prod.outlook.com (2603:10b6:a03:54::49) To MWHPR2201MB1277.namprd22.prod.outlook.com (2603:10b6:301:24::17) authentication-results: spf=none (sender IP is ) smtp.mailfrom=pburton@wavecomp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [67.207.99.198] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;MWHPR2201MB1758;6:kBkfhsEdXhTs4mG3SdpOyuMzR4b/ZcPUSIEnaPQcKEWx7j4k0zlz1iisyR7xtNx/zxhYZZlMqx3hgeFBdpPt8V3BbUHRIsVHh8cVHnoEhadVzkLT7dI+9P35yVeW6OGkzAhhINKTmwVUBkYMMagGAgrlnAV3t4aO5Gm/WdgdVK6HUi2zVAlb2FSSNzVPNr2WMZISLXJ+z/ivABJBuVKY3QQIY5xMVAGyupCbjBayjTvrHRgsdYXuWiLRla17Lb1TYICI1PbT1KutuFlUDQ0fwmlGCpUB6bqbF12oAz1LLcDFGI0uSer894ZXN3TJtmSc9FLK2rpfe1coL1sq/H52fJXNcAuQfXNddoQjxxwuPKX/xCnx4pDVibmppPz1iJv+0ACcT/pV/3eGN79LflLDJQY7kvbYNo1wGmbFjxi18VpV8vNpiIYYrWS/tO3BBjEDab6btUy4kHqwbsXUC6ouJg==;5:zJ1pdLpQDHdxPnB1qwzIsl9aQScU6kQ8DikM+0F0yxJHW2B97PZTu1cwz7DX5XrbrvJIrpCVQbpIDBM4Dv3lCyr6okcjMc61XvN/2B6ASit4u5475TxmhU/oO+2EF3t1HPfNFvL41HS3YuHn81o9xnYHGh6T4NEM3m149WIMZAnymRiEUA+p2b2+mfPSXllk5i5Fj5e8G8ZbByGnPiCJ+g==;7:4F29qu7KkBmq+9pOAbSu4L1+TbDJpKU5k0fm6REZn1lS6OKml3tvP7lu6RXdQRCGZx/zkb70iAdKVQfJLyswwUHsffFGBp0WyqCZNg9K1XvBTGN5vUEqq1JDtb/1PDbBHqjI1wWHY9MhDEBFzU2Wnw== x-ms-office365-filtering-correlation-id: 31be6e73-cd8a-42b4-4352-08d6768879df x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600109)(711020)(2017052603328)(7153060)(7193020);SRVR:MWHPR2201MB1758; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: mips.com X-MS-Exchange-CrossTenant-Network-Message-Id: 31be6e73-cd8a-42b4-4352-08d6768879df X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Jan 2019 23:16:25.5741 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 463607d3-1db3-40a0-8a29-970c56230104 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR2201MB1758 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org When building using GCC 4.7 or older, -ffunction-sections & the -pg flag used by ftrace are incompatible. This causes warnings or build failures (where -Werror applies) such as the following: arch/mips/generic/init.c: error: -ffunction-sections disabled; it makes profiling impossible This used to be taken into account by the ordering of calls to cc-option from within the top-level Makefile, which was introduced by commit 90ad4052e85c ("kbuild: avoid conflict between -ffunction-sections and -pg on gcc-4.7"). Unfortunately this was broken when the CONFIG_LD_DEAD_CODE_DATA_ELIMINATION cc-option check was moved to Kconfig in commit e85d1d65cd8a ("kbuild: test dead code/data elimination support in Kconfig"), because the flags used by this check no longer include -pg. Fix this by not allowing CONFIG_LD_DEAD_CODE_DATA_ELIMINATION to be enabled at the same time as ftrace/CONFIG_FUNCTION_TRACER when building using GCC 4.7 or older. Signed-off-by: Paul Burton Fixes: e85d1d65cd8a ("kbuild: test dead code/data elimination support in Kc= onfig") Reported-by: Geert Uytterhoeven Cc: Masahiro Yamada Cc: Nicholas Piggin Cc: stable@vger.kernel.org # v4.19+ --- init/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/init/Kconfig b/init/Kconfig index d47cb77a220e..c787f782148d 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1124,6 +1124,7 @@ config LD_DEAD_CODE_DATA_ELIMINATION bool "Dead code and data elimination (EXPERIMENTAL)" depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION depends on EXPERT + depends on !FUNCTION_TRACER || !CC_IS_GCC || GCC_VERSION >=3D 40800 depends on $(cc-option,-ffunction-sections -fdata-sections) depends on $(ld-option,--gc-sections) help --=20 2.20.1