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Message-ID: <21c5336c-96e3-fdae-dc52-c1ab2f52df3b@infradead.org>
Date:   Thu, 17 Mar 2022 07:23:08 -0700
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Subject: Re: [powerpc] 5.17-rc8-next-20220317 build break kernel/sched/fair.o
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To:     Sachin Sant <sachinp@linux.ibm.com>, linux-next@vger.kernel.org,
        Ingo Molnar <mingo@redhat.com>
Cc:     open list <linux-kernel@vger.kernel.org>
References: <EF33D230-9A8F-41C5-A38D-95128603224F@linux.ibm.com>
From:   Randy Dunlap <rdunlap@infradead.org>
In-Reply-To: <EF33D230-9A8F-41C5-A38D-95128603224F@linux.ibm.com>
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On 3/17/22 03:35, Sachin Sant wrote:
> Today’s next (5.17.0-rc8-next-20220317) fails to build on powerpc
> with following error:
> 
>   CC      kernel/sched/fair.o
> In file included from ./arch/powerpc/include/generated/asm/rwonce.h:1,
>                  from ./include/linux/compiler.h:248,
>                  from ./include/linux/kernel.h:20,
>                  from ./include/linux/cpumask.h:10,
>                  from ./include/linux/energy_model.h:4,
>                  from kernel/sched/fair.c:23:
> ./include/linux/psi.h: In function 'cgroup_move_task':
> ./include/linux/rcupdate.h:414:36: error: dereferencing pointer to incomplete type 'struct css_set'
>  #define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v)
>                                     ^~~~
> ./include/asm-generic/rwonce.h:55:33: note: in definition of macro '__WRITE_ONC'
>   *(volatile typeof(x) *)&(x) = (val);    \
>                                  ^~~
> ./arch/powerpc/include/asm/barrier.h:74:2: note: in expansion of macro 'WRITE_ONCE'
>   WRITE_ONCE(*p, v);      \
>   ^~~~~~~~~~
> ./include/asm-generic/barrier.h:164:55: note: in expansion of macro '__smp_store_release'
>  #define smp_store_release(p, v) do { kcsan_release(); __smp_store_release(p, v); } while (0)
>                                                        ^~~~~~~~~~~~~~~~~~~
> ./include/linux/rcupdate.h:455:3: note: in expansion of macro 'smp_store_releas'
>    smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
>    ^~~~~~~~~~~~~~~~~
> ./include/linux/rcupdate.h:455:25: note: in expansion of macro 'RCU_INITIALIZER'
>    smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
>                          ^~~~~~~~~~~~~~~
> ./include/linux/psi.h:58:2: note: in expansion of macro 'rcu_assign_pointer'
>   rcu_assign_pointer(p->cgroups, to);
>   ^~~~~~~~~~~~~~~~~~
> make[2]: *** [scripts/Makefile.build:309: kernel/sched/fair.o] Error 1
> make[1]: *** [scripts/Makefile.build:578: kernel/sched] Error 2
> make: *** [Makefile:1834: kernel] Error 2
> 
> Git bisect points to:
> 
> commit c4ad6fcb67c42d65481c85733c8009c8afdfdf4e (refs/bisect/bad)
>     sched/headers: Reorganize, clean up and optimize kernel/sched/fair.c dependencies
> 
> I have attached .config

Here is a fix for the CONFIG_PSI=n build error:

https://lore.kernel.org/lkml/917e9ce0-c8cf-61b2-d1ba-ebf25bbd979d@infradead.org/

-- 
~Randy