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Wed, 4 Mar 2026 17:35:32 +0000 Received: from MAUPR01MB11546.INDPRD01.PROD.OUTLOOK.COM ([fe80::1fed:9b0b:69b:9295]) by MAUPR01MB11546.INDPRD01.PROD.OUTLOOK.COM ([fe80::1fed:9b0b:69b:9295%6]) with mapi id 15.20.9678.016; Wed, 4 Mar 2026 17:35:32 +0000 From: Aditya Garg To: "zohar@linux.ibm.com" , "akpm@linux-foundation.org" , Harshit Mogalapalli , Greg Kroah-Hartman CC: "ardb@kernel.org" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "graf@amazon.com" , "guoweikang.kernel@gmail.com" , "harshit.m.mogalapalli@oracle.com" , "henry.willard@oracle.com" , "hpa@zytor.com" , "jbohac@suse.cz" , "joel.granados@kernel.org" , "linux-kernel@vger.kernel.org" , "mingo@redhat.com" , "noodles@fb.com" , "paul.x.webb@oracle.com" , "rppt@kernel.org" , "sohil.mehta@intel.com" , "sourabhjain@linux.ibm.com" , "stable@vger.kernel.org" , "tglx@linutronix.de" , "x86@kernel.org" , "yifei.l.liu@oracle.com" Subject: [REGRESSION] Linux kernel 6.12.75 fails to compile with -Werror=implicit-function-declaration Thread-Topic: [REGRESSION] Linux kernel 6.12.75 fails to compile with -Werror=implicit-function-declaration Thread-Index: AQHcq/1MP8Eq+Ikw2U2JfmA32VghVg== Date: Wed, 4 Mar 2026 17:35:31 +0000 Message-ID: Accept-Language: en-IN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-publictraffictype: Email x-ms-traffictypediagnostic: MAUPR01MB11546:EE_|MAZPR01MB8890:EE_ x-ms-office365-filtering-correlation-id: c66600e2-e56e-4fa2-3687-08de7a146ed6 x-microsoft-antispam: BCL:0;ARA:14566002|39105399006|461199028|19110799012|15080799012|31061999003|5062599005|8060799015|8062599012|1602099012|40105399003|41105399003|440099028|4302099013|3412199025|10035399007|102099032; 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charset="us-ascii" Content-ID: <1E43091702983E438EB6E7E97D026EC5@INDPRD01.PROD.OUTLOOK.COM> Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: sct-15-20-9412-4-msonline-outlook-63b91.templateTenant X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MAUPR01MB11546.INDPRD01.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: c66600e2-e56e-4fa2-3687-08de7a146ed6 X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Mar 2026 17:35:31.0159 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MAZPR01MB8890 Hi I found out that Linux kernel 6.12.75 failed to compiled in my automatic bu= ilds. The compiler throws the error: arch/x86/kernel/setup.c: In function 'ima_get_kexec_buffer': arch/x86/kernel/setup.c:380:15: error: implicit declaration of function 'im= a_validate_range' [-Werror=3Dimplicit-function-declaration] 380 | ret =3D ima_validate_range(ima_kexec_buffer_phys, ima_kexec_b= uffer_size); | ^~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors make[7]: *** [scripts/Makefile.build:229: arch/x86/kernel/setup.o] Error 1 make[6]: *** [scripts/Makefile.build:466: arch/x86/kernel] Error 2 make[5]: *** [scripts/Makefile.build:466: arch/x86] Error 2 Upon searching a bit, I found out that failure of this patch to be backport= ed seems to be main reason: https://lore.kernel.org/all/20251231061609.907170-2-harshit.m.mogalapalli@o= racle.com/ Looks like this series itself was not properly backported. I am not sure if any other kernel version is affected. I currently build 6.= 19 and 6.12 series for my use. Thanks! Aditya