Kernel failing to build on 32-bit powerpc

Kernel failing to build on 32-bit powerpc

[John Paul Adrian Glaubitz]

Hi,

could someone investigate the following build failure on powerpc [1], please?

In file included from /build/reproducible-path/linux-6.16.12/kernel/sched/build_policy.c:64:
/build/reproducible-path/linux-6.16.12/kernel/sched/ext_idle.c: In function ‘is_bpf_migration_disabled’:
/build/reproducible-path/linux-6.16.12/kernel/sched/ext_idle.c:893:14: error: ‘const struct task_struct’ has no member named ‘migration_disabled’
  893 |         if (p->migration_disabled == 1)
      |              ^~
/build/reproducible-path/linux-6.16.12/kernel/sched/ext_idle.c:896:25: error: ‘const struct task_struct’ has no member named ‘migration_disabled’
  896 |                 return p->migration_disabled;
      |                         ^~

Thanks,
Adrian

> [1] https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpc&ver=6.16.12-2&stamp=1760639059&raw=0

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Re: Kernel failing to build on 32-bit powerpc

[Christophe Leroy]

Hi,

Le 16/10/2025 à 21:03, John Paul Adrian Glaubitz a écrit :
> Hi,
> 
> could someone investigate the following build failure on powerpc [1], please?
> 
> In file included from /build/reproducible-path/linux-6.16.12/kernel/sched/build_policy.c:64:
> /build/reproducible-path/linux-6.16.12/kernel/sched/ext_idle.c: In function ‘is_bpf_migration_disabled’:
> /build/reproducible-path/linux-6.16.12/kernel/sched/ext_idle.c:893:14: error: ‘const struct task_struct’ has no member named ‘migration_disabled’
>    893 |         if (p->migration_disabled == 1)
>        |              ^~
> /build/reproducible-path/linux-6.16.12/kernel/sched/ext_idle.c:896:25: error: ‘const struct task_struct’ has no member named ‘migration_disabled’
>    896 |                 return p->migration_disabled;
>        |                         ^~
> 

I guess 6.16.12 is missing commit cac5cefbade9 ("sched/smp: Make SMP 
unconditional")

Christophe

Re: Kernel failing to build on 32-bit powerpc

[Greg Kroah-Hartman]

On Fri, Oct 17, 2025 at 08:49:06AM +0200, Christophe Leroy wrote:
> Hi,
> 
> Le 16/10/2025 à 21:03, John Paul Adrian Glaubitz a écrit :
> > Hi,
> > 
> > could someone investigate the following build failure on powerpc [1], please?
> > 
> > In file included from /build/reproducible-path/linux-6.16.12/kernel/sched/build_policy.c:64:
> > /build/reproducible-path/linux-6.16.12/kernel/sched/ext_idle.c: In function ‘is_bpf_migration_disabled’:
> > /build/reproducible-path/linux-6.16.12/kernel/sched/ext_idle.c:893:14: error: ‘const struct task_struct’ has no member named ‘migration_disabled’
> >    893 |         if (p->migration_disabled == 1)
> >        |              ^~
> > /build/reproducible-path/linux-6.16.12/kernel/sched/ext_idle.c:896:25: error: ‘const struct task_struct’ has no member named ‘migration_disabled’
> >    896 |                 return p->migration_disabled;
> >        |                         ^~
> > 
> 
> I guess 6.16.12 is missing commit cac5cefbade9 ("sched/smp: Make SMP
> unconditional")

6.16 is now end-of-life, so not much we can do there, sorry.

greg k-h