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Wed, 7 Jan 2026 04:51:53 +0000 (GMT) Message-ID: <1bf48c07-6035-4527-841c-64114e1cd164@linux.ibm.com> Date: Wed, 7 Jan 2026 10:21:53 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [next-20251219]Build Failure on IBM Power system To: Venkat Rao Bagalkote , Madhavan Srinivasan References: <193bd91f-d6d7-43e4-8d9b-308908717b68@linux.ibm.com> Content-Language: en-US From: Shrikanth Hegde Cc: Linux Next Mailing List , LKML , Peter Zijlstra , Stephen Rothwell , Ingo Molnar In-Reply-To: <193bd91f-d6d7-43e4-8d9b-308908717b68@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=P4s3RyAu c=1 sm=1 tr=0 ts=695de671 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=e5mUnYsNAAAA:8 a=JfrnYn6hAAAA:8 a=VnNF1IyMAAAA:8 a=S90bURE-p-aBQpvveKQA:9 a=PRpDppDLrCsA:10 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=Vxmtnl_E_bksehYqCbjh:22 a=1CNFftbPRP8L7MoqJWF3:22 X-Proofpoint-ORIG-GUID: MX7BXZX2EtYdmbx1HJibXzBH1vZZNwsr X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTA3MDAzNiBTYWx0ZWRfX9A20zy8F1vAB PsiPfdEK6+chZCNkmeTiANpqMCAcX6f+LrJtKvHORHP/2mjALsUBpxEbzjJF3oXYD1YlWO2K+a/ fazX7rqMLftNACV8iDbSRahpb4HPcEnONykTLXv3c7X1S48fyzBIW9fFZoBAWhOjQQAMXkFr+Y4 fSqPXUT/p67d01voLPXF0JluqXSDKLnt+Bfc/V3pPhrjHEgXiXGqj0TnW0Ri+kCVC3bnjaQ07kP +EDW+7534W+eZmYNqacFzFel3KM54TKsbP8IDige5fl/fTxetGg5mEWkHKt+JQob+kKgUHzXLv+ so76/jSNtgSl0phtKA4Xw4hC1BwNKiTpHa1so1RTuMu9VxFPARRyAVP/SMV2wxRu3pMwpmFVUG6 rG2Jgf06DO6fWvrUaPLbG5HEz8stph3Wy7CWq2VLYOPhvk6vFwjioH64JojWXoWX/zprQ7wKpIW 7eMvcAKUDVCwk4TlIrQ== X-Proofpoint-GUID: MX7BXZX2EtYdmbx1HJibXzBH1vZZNwsr X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-06_03,2026-01-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 priorityscore=1501 clxscore=1015 suspectscore=0 phishscore=0 adultscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2512120000 definitions=main-2601070036 Hi Venkat. On 1/1/26 10:50 AM, Venkat Rao Bagalkote wrote: > Greetings!!! > > > IBM CI has reported a build failure on next-20251219 build. > > > Build Failure: > > cc1: some warnings being treated as errors > make[4]: *** [scripts/Makefile.build:287: kernel/sched/build_policy.o] > Error 1 > make[4]: *** Waiting for unfinished jobs.... > make[3]: *** [scripts/Makefile.build:556: kernel/sched] Error 2 > make[3]: *** Waiting for unfinished jobs.... > make[2]: *** [scripts/Makefile.build:556: kernel] Error 2 > make[2]: *** Waiting for unfinished jobs.... > Maddy had shared the failing log. Please share log like this in the report. In file included from kernel/sched/build_policy.c:62: kernel/sched/ext.c: In function 'do_pick_task_scx': kernel/sched/ext.c:2470:27: error: implicit declaration of function 'rq_modified_above' [-Wimplicit-function-declaration] 2470 | if (!force_scx && rq_modified_above(rq, &ext_sched_class)) | ^~~~~~~~~~~~~~~~~ make[4]: *** [scripts/Makefile.build:287: kernel/sched/build_policy.o] Error 1 > > IBM CI has bisected this issue to below commit. > > > 5d1f0b2f278eb55aebe29210fbc8f352c53497d6 is the first bad commit > commit 5d1f0b2f278eb55aebe29210fbc8f352c53497d6 > Author: Peter Zijlstra > Date:   Wed Dec 10 09:06:50 2025 +0100 > > > Bisection Logs: > > #git bisect log > git bisect log > git bisect start > # status: waiting for both good and bad commits > # good: [8f0b4cce4481fb22653697cced8d0d04027cb1e8] Linux 6.19-rc1 > git bisect good 8f0b4cce4481fb22653697cced8d0d04027cb1e8 > # status: waiting for bad commit, 1 good commit known > # bad: [cc3aa43b44bdb43dfbac0fcb51c56594a11338a8] Add linux-next > specific files for 20251219 > git bisect bad cc3aa43b44bdb43dfbac0fcb51c56594a11338a8 > # good: [600a692707acda49434d6c2c03dda20f46e09749] Merge branch > 'libcrypto-next' of https://git.kernel.org/pub/scm/linux/kernel/git/ > ebiggers/linux.git > git bisect good 600a692707acda49434d6c2c03dda20f46e09749 > # good: [816a7181ac38fd22243edb557537b2aecb9eeb76] Merge branch 'drm-xe- > next' of https://gitlab.freedesktop.org/drm/xe/kernel.git > git bisect good 816a7181ac38fd22243edb557537b2aecb9eeb76 > # good: [7157d55093613cf905cfd665772eae35d5c388f0] Merge branch 'for- > next' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git > git bisect good 7157d55093613cf905cfd665772eae35d5c388f0 > # bad: [52af2cfd69d264f1a370693966acf5d96943add8] Merge branch 'extcon- > next' of https://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon.git > git bisect bad 52af2cfd69d264f1a370693966acf5d96943add8 > # bad: [502068d3b65cc8695f8da83a7f19c90805c958ca] next-20251217/tip > git bisect bad 502068d3b65cc8695f8da83a7f19c90805c958ca > # bad: [c06f166058309936567065e737f6f5d9609a1a87] Merge branch into tip/ > master: 'sched/core' > git bisect bad c06f166058309936567065e737f6f5d9609a1a87 > # good: [e2292f5c21542354246687d8e3e48a58b046e27b] Merge branch into > tip/master: 'irq/msi' > git bisect good e2292f5c21542354246687d8e3e48a58b046e27b > # good: [fb9a7458e508ef1beae8d80ee40c2cd1b5b45f3a] sched/fair: Clean up > comments in 'struct cfs_rq' > git bisect good fb9a7458e508ef1beae8d80ee40c2cd1b5b45f3a > # good: [527a521029c3edd38fb9fc96cd58e3fd7393d28e] sched/fair: Sort out > 'blocked_load*' namespace noise > git bisect good 527a521029c3edd38fb9fc96cd58e3fd7393d28e > # good: [7ac422cf7b16ec524bcd8e017459e328a4103f63] perf/x86/intel/ > cstate: Add Diamond Rapids support > git bisect good 7ac422cf7b16ec524bcd8e017459e328a4103f63 > # bad: [5d1f0b2f278eb55aebe29210fbc8f352c53497d6] sched/core: Rework > sched_class::wakeup_preempt() and rq_modified_*() > git bisect bad 5d1f0b2f278eb55aebe29210fbc8f352c53497d6 > # first bad commit: [5d1f0b2f278eb55aebe29210fbc8f352c53497d6] sched/ > core: Rework sched_class::wakeup_preempt() and rq_modified_*() > > > > If you happen to fix this issue, please add below tag. > > > Reported-by: Venkat Rao Bagalkote > > > > Regards, > > Venkat. > > This seems like temporary some issue with merging. For example the problematic commit doesn't have the full patch as in sched/core https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/kernel/sc[…]c?h=next-20251219&id=5d1f0b2f278eb55aebe29210fbc8f352c53497d6 I have checked the latest tag next-20260106. Full patch is there in that. https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/kernel/sched?h=next-20260106&id=704069649b5bfb7bf1fe32c0281fe9036806a59a I have checked in tip/sched/core. There is no reference to rq_modified_above. So, Fair to say we can ignore this report.