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Fri, 9 Jan 2026 04:47:19 +0000 (GMT) Message-ID: <7d18f263-62a6-40b4-a623-0abda69b8a4b@linux.ibm.com> Date: Fri, 9 Jan 2026 10:17:17 +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 Content-Language: en-GB To: Shrikanth Hegde , Madhavan Srinivasan Cc: Linux Next Mailing List , LKML , Peter Zijlstra , Stephen Rothwell , Ingo Molnar References: <193bd91f-d6d7-43e4-8d9b-308908717b68@linux.ibm.com> <1bf48c07-6035-4527-841c-64114e1cd164@linux.ibm.com> From: Venkat Rao Bagalkote In-Reply-To: <1bf48c07-6035-4527-841c-64114e1cd164@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=QbNrf8bv c=1 sm=1 tr=0 ts=6960885c cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=e5mUnYsNAAAA:8 a=WsHKUha7AAAA:8 a=JfrnYn6hAAAA:8 a=VnNF1IyMAAAA:8 a=O8L-_KDFGmi8-4GouUwA:9 a=PRpDppDLrCsA:10 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=Vxmtnl_E_bksehYqCbjh:22 a=H4LAKuo8djmI0KOkngUh:22 a=1CNFftbPRP8L7MoqJWF3:22 X-Proofpoint-ORIG-GUID: vjTXVwKEhKU2RDBP61pQHAt69ndSb6e2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTA5MDAzMCBTYWx0ZWRfX3OJVXYuyO+FC sQBT3bKESnPD7iQGZ8RPk55y4A+pO9qhFLS4xYW087WUhgYFCoDX+S5ZONsxBFGNwFwCdaFSBY9 Nzblu0OKYh7VvEyX0/0UuUSAl5M5nWBvPm2UTQfNEjkTe/X4GCMcdAD5NSFo+ceqbItT2CRoCGL sIWfdNM+1x5hFS8FxjlETEGhf/zReXRPYKF0ZNZePt+A8q78JJcujWPoVI6cJe0dW6fvTkrPJl5 rXJkA2iXMPFMgrJzMHLi1QdVxfScgHdJ4EvX9SIwW1ETOMZD6LkVyBJsitRqb9YQ9zIH0CmA8ho XU8HgtLGtf6Z36S8VYy7aGNI2zNOrZKqglzX7JXv0JR5b5Z6hkmYvB/GA/68eEmVQOE1pEeUHTa UNoD/LXqTKImm+OguUOb8CEJlN/mlJ30+hjb2RK9Lt3MYuBsztycSxY6Q08btch3e60mfCo3HIx A41IMI7N5kuaJ9VTPOg== X-Proofpoint-GUID: vjTXVwKEhKU2RDBP61pQHAt69ndSb6e2 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=2026-01-09_01,2026-01-08_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 bulkscore=0 suspectscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 impostorscore=0 phishscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2512120000 definitions=main-2601090030 Hello Shrikanth, On 07/01/26 10:21 am, Shrikanth Hegde wrote: > 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. Sure, Point taken. > > 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. Thanks for the review and conforming. Looks like, this is fixed here. https://lore.kernel.org/all/20251217095801.GC3708021@noisy.programming.kicks-ass.net/ Regards, Venkat.