linux-kernel - Re: [PATCH] PSI: select KERNFS as needed

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Message-ID: <CAJuCfpGQzpWptS0WBBzw8XesPFb5MeG5UVLFDce72wfXNA1joQ@mail.gmail.com>
Date:   Mon, 31 Jul 2023 11:14:46 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH] PSI: select KERNFS as needed

On Sun, Jul 30, 2023 at 8:07 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> Users of KERNFS should select it to enforce its being built, so
> do this to prevent a build error.
>
> In file included from ../kernel/sched/build_utility.c:97:
> ../kernel/sched/psi.c: In function 'psi_trigger_poll':
> ../kernel/sched/psi.c:1479:17: error: implicit declaration of function 'kernfs_generic_poll' [-Werror=implicit-function-declaration]
>  1479 |                 kernfs_generic_poll(t->of, wait);
>
> Fixes: aff037078eca ("sched/psi: use kernfs polling functions for PSI trigger polling")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Reported-by: kernel test robot <lkp@...el.com>
> Link: lore.kernel.org/r/202307310732.r65EQFY0-lkp@...el.com
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Suren Baghdasaryan <surenb@...gle.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Juri Lelli <juri.lelli@...hat.com>
> Cc: Vincent Guittot <vincent.guittot@...aro.org>

Acked-by: Suren Baghdasaryan <surenb@...gle.com>

Thanks!


> ---
>  init/Kconfig |    1 +
>  1 file changed, 1 insertion(+)
>
> diff -- a/init/Kconfig b/init/Kconfig
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -629,6 +629,7 @@ config TASK_IO_ACCOUNTING
>
>  config PSI
>         bool "Pressure stall information tracking"
> +       select KERNFS
>         help
>           Collect metrics that indicate how overcommitted the CPU, memory,
>           and IO capacity are in the system.