linux-kernel - Re: [PATCH] cputime: remove cputime_to

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Date:   Wed, 21 Dec 2022 11:11:21 +0100
From:   Alexander Gordeev <agordeev@...ux.ibm.com>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Rik van Riel <riel@...riel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH] cputime: remove cputime_to_nsecs fallback

On Tue, Dec 20, 2022 at 05:07:05PM +1000, Nicholas Piggin wrote:
> The archs that use cputime_to_nsecs() internally provide their own
> definition and don't need the fallback. cputime_to_usecs() unused except
> in this fallback, and is not defined anywhere.
> 
> This removes the final remnant of the cputime_t code from the kernel.
> 
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Rik van Riel <riel@...riel.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Sven Schnelle <svens@...ux.ibm.com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-s390@...r.kernel.org
> Signed-off-by: Nicholas Piggin <npiggin@...il.com>
> ---
> This required a couple of tweaks to s390 includes so we're not pulling
> asm/cputime.h into the core header unnecessarily. In that case maybe
> this can go via s390 tree because the patch should be otherwise quite
> trivial. Could it get an ack or two from a core maintainer to support
> that?
> 
> Thanks,
> Nick
> 
>  arch/s390/kernel/idle.c       | 2 +-
>  arch/s390/kernel/vtime.c      | 2 +-
>  include/linux/sched/cputime.h | 9 ---------
>  kernel/sched/cputime.c        | 4 ++++
>  4 files changed, 6 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/s390/kernel/idle.c b/arch/s390/kernel/idle.c
> index 4bf1ee293f2b..a6bbceaf7616 100644
> --- a/arch/s390/kernel/idle.c
> +++ b/arch/s390/kernel/idle.c
> @@ -12,9 +12,9 @@
>  #include <linux/notifier.h>
>  #include <linux/init.h>
>  #include <linux/cpu.h>
> -#include <linux/sched/cputime.h>
>  #include <trace/events/power.h>
>  #include <asm/cpu_mf.h>
> +#include <asm/cputime.h>
>  #include <asm/nmi.h>
>  #include <asm/smp.h>
>  #include "entry.h"
> diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
> index 9436f3053b88..e0a88dcaf5cb 100644
> --- a/arch/s390/kernel/vtime.c
> +++ b/arch/s390/kernel/vtime.c
> @@ -7,13 +7,13 @@
>   */
>  
>  #include <linux/kernel_stat.h>
> -#include <linux/sched/cputime.h>
>  #include <linux/export.h>
>  #include <linux/kernel.h>
>  #include <linux/timex.h>
>  #include <linux/types.h>
>  #include <linux/time.h>
>  #include <asm/alternative.h>
> +#include <asm/cputime.h>
>  #include <asm/vtimer.h>
>  #include <asm/vtime.h>
>  #include <asm/cpu_mf.h>
> diff --git a/include/linux/sched/cputime.h b/include/linux/sched/cputime.h
> index ce3c58286062..5f8fd5b24a2e 100644
> --- a/include/linux/sched/cputime.h
> +++ b/include/linux/sched/cputime.h
> @@ -8,15 +8,6 @@
>   * cputime accounting APIs:
>   */
>  
> -#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
> -#include <asm/cputime.h>
> -
> -#ifndef cputime_to_nsecs
> -# define cputime_to_nsecs(__ct)	\
> -	(cputime_to_usecs(__ct) * NSEC_PER_USEC)
> -#endif
> -#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
> -
>  #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
>  extern bool task_cputime(struct task_struct *t,
>  			 u64 *utime, u64 *stime);
> diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
> index 95fc77853743..af7952f12e6c 100644
> --- a/kernel/sched/cputime.c
> +++ b/kernel/sched/cputime.c
> @@ -3,6 +3,10 @@
>   * Simple CPU accounting cgroup controller
>   */
>  
> +#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
> + #include <asm/cputime.h>
> +#endif
> +
>  #ifdef CONFIG_IRQ_TIME_ACCOUNTING
>  
>  /*

For s390:

Acked-by: Alexander Gordeev <agordeev@...ux.ibm.com>