Bug 824586 – sys-kernel/gentoo-sources-5.14.20 build failure

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Hadrien Lacour 2021-11-18 20:49:29 UTC]

Created attachment 752670 [details]
emerge --info '=sys-kernel/gentoo-sources-5.14.20'

Failed to build with

kernel/sched/alt_core.c:2765:6: error: conflicting types for ‘sched_post_fork’; have ‘void(struct task_struct *)’
 2765 | void sched_post_fork(struct task_struct *p) {}
      |      ^~~~~~~~~~~~~~~
In file included from ./include/linux/sched/signal.h:9,
                 from ./include/linux/rcuwait.h:6,
                 from ./include/linux/percpu-rwsem.h:7,
                 from ./include/linux/fs.h:33,
                 from ./include/linux/huge_mm.h:8,
                 from ./include/linux/mm.h:728,
                 from ./include/linux/ring_buffer.h:5,
                 from ./include/linux/trace_events.h:6,
                 from ./include/trace/trace_events.h:21,
                 from ./include/trace/define_trace.h:102,
                 from ./include/trace/events/sched.h:738,
                 from kernel/sched/alt_core.c:15:
./include/linux/sched/task.h:57:13: note: previous declaration of ‘sched_post_fork’ with type ‘void(struct task_struct *, struct kernel_clone_args *)’
   57 | extern void sched_post_fork(struct task_struct *p,
      |             ^~~~~~~~~~~~~~~
  CC      kernel/trace/trace_nop.o
make[2]: *** [scripts/Makefile.build:271: kernel/sched/alt_core.o] Error 1
make[2]: *** Waiting for unfinished jobs....

Attaching emerge --info and kernel config

[Comment 1 Hadrien Lacour 2021-11-18 20:49:51 UTC]

Created attachment 752674 [details]
kernel config

[Comment 2 Mike Pagano 2021-11-18 21:28:40 UTC]

Created attachment 752678 [details, diff]
Fix function declaration

Can you try this?

[Comment 3 Mike Pagano 2021-11-18 23:56:44 UTC]

(In reply to Mike Pagano from comment #2)
> Created attachment 752678 [details, diff] [details, diff]
> Fix function declaration
> 
> Can you try this?

nevermind that's against 5.15.  I'll commit a fix for 5.14

[Comment 4 Mike Pagano 2021-11-19 00:18:55 UTC]

commit 17ecdd1bda59626c4d9ae901a5e75370cb8b3674 (HEAD -> 5.14, origin/5.14)
Author: Mike Pagano <[e-mail]>
Date:   Thu Nov 18 19:17:09 2021 -0500

    Fix for BMQ(BitMap Queue) Scheduler
    
    Bug: https://bugs.gentoo.org/824586
    
    Signed-off-by: Mike Pagano <[e-mail]>

[Comment 5 setun.90 2021-11-19 08:48:35 UTC]

I'm getting this exact bug with 5.15.3 too; 5.15.2 builds fine.

[Comment 6 MZ 2021-11-19 09:18:18 UTC]

same problem 5.15.3

...
AR      arch/x86/built-in.a
  CC      kernel/sched/alt_core.o
kernel/sched/alt_core.c:2997:6: error: conflicting types for ‘sched_post_fork’; have ‘void(struct task_struct *)’
 2997 | void sched_post_fork(struct task_struct *p) {}
      |      ^~~~~~~~~~~~~~~
In file included from ./include/linux/sched/signal.h:9,
                 from ./include/linux/rcuwait.h:6,
                 from ./include/linux/percpu-rwsem.h:7,
                 from ./include/linux/fs.h:33,
                 from ./include/linux/huge_mm.h:8,
                 from ./include/linux/mm.h:727,
                 from ./include/linux/ring_buffer.h:5,
                 from ./include/linux/trace_events.h:6,
                 from ./include/trace/trace_events.h:21,
                 from ./include/trace/define_trace.h:102,
                 from ./include/trace/events/sched.h:738,
                 from kernel/sched/alt_core.c:15:
./include/linux/sched/task.h:57:13: note: previous declaration of ‘sched_post_fork’ with type ‘void(struct task_struct *, struct kernel_clone_args *)’
   57 | extern void sched_post_fork(struct task_struct *p,
      |             ^~~~~~~~~~~~~~~
make[2]: *** [scripts/Makefile.build:277: kernel/sched/alt_core.o] Error 1
make[1]: *** [scripts/Makefile.build:540: kernel/sched] Error 2
make: *** [Makefile:1868: kernel] Error 2

[Comment 7 Mike Pagano 2021-11-19 14:52:04 UTC]

commit 988c70b911d405821a00b9afa2728bf59e24d1bb (HEAD -> 5.15, origin/5.15)
Author: Mike Pagano <[e-mail]>
Date:   Fri Nov 19 09:51:23 2021 -0500

    Fix for BMQ(BitMap Queue) Scheduler
    
    Bug: https://bugs.gentoo.org/824586
    
    Signed-off-by: Mike Pagano <[e-mail]>

[Comment 8 Hadrien Lacour 2021-11-19 17:49:53 UTC]

Works fine, thanks.

[Comment 9 Mike Pagano 2021-11-20 22:44:35 UTC]

*** Bug 825346 has been marked as a duplicate of this bug. ***

[Comment 10 James Beddek 2021-11-20 23:17:14 UTC]

Upstream fix: https://gitlab.com/alfredchen/linux-prjc/-/commit/9ba8f42a10910dd40af229a22e00f00cbcee480b

[Comment 11 Mike Pagano 2021-11-21 22:57:47 UTC]

Upgrade to 5.15 for BMQ.  This kernel is EOL'd.