linux-kernel - Re: [PATCHv2 1/4] kernel/watchdog: trival cleanups

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Message-ID: <YVrKOUVnDFjKOiNZ@alley>
Date:   Mon, 4 Oct 2021 11:32:41 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Pingfan Liu <kernelfans@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Wang Qing <wangqing@...o.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Santosh Sivaraj <santosh@...six.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv2 1/4] kernel/watchdog: trival cleanups

On Thu 2021-09-23 22:09:48, Pingfan Liu wrote:
> No reference to WATCHDOG_DEFAULT, remove it.
> 
> And nobody cares about the return value of watchdog_nmi_enable(),
> changing its prototype to void.
> 
> Signed-off-by: Pingfan Liu <kernelfans@...il.com>
> Cc: Petr Mladek <pmladek@...e.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Wang Qing <wangqing@...o.com>
> Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>
> Cc: Santosh Sivaraj <santosh@...six.org>
> Cc: linux-arm-kernel@...ts.infradead.org
> To: linux-kernel@...r.kernel.org
> ---
>  include/linux/nmi.h | 2 +-
>  kernel/watchdog.c   | 5 +----
>  2 files changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/nmi.h b/include/linux/nmi.h
> index 750c7f395ca9..b7bcd63c36b4 100644
> --- a/include/linux/nmi.h
> +++ b/include/linux/nmi.h
> @@ -119,7 +119,7 @@ static inline int hardlockup_detector_perf_init(void) { return 0; }
>  void watchdog_nmi_stop(void);
>  void watchdog_nmi_start(void);
>  int watchdog_nmi_probe(void);
> -int watchdog_nmi_enable(unsigned int cpu);
> +void watchdog_nmi_enable(unsigned int cpu);
>  void watchdog_nmi_disable(unsigned int cpu);
>  
>  /**
> diff --git a/kernel/watchdog.c b/kernel/watchdog.c
> index ad912511a0c0..6e6dd5f0bc3e 100644
> --- a/kernel/watchdog.c
> +++ b/kernel/watchdog.c
> @@ -30,10 +30,8 @@
>  static DEFINE_MUTEX(watchdog_mutex);
>  
>  #if defined(CONFIG_HARDLOCKUP_DETECTOR) || defined(CONFIG_HAVE_NMI_WATCHDOG)
> -# define WATCHDOG_DEFAULT	(SOFT_WATCHDOG_ENABLED | NMI_WATCHDOG_ENABLED)
>  # define NMI_WATCHDOG_DEFAULT	1
>  #else
> -# define WATCHDOG_DEFAULT	(SOFT_WATCHDOG_ENABLED)
>  # define NMI_WATCHDOG_DEFAULT	0
>  #endif
>  
> @@ -95,10 +93,9 @@ __setup("nmi_watchdog=", hardlockup_panic_setup);
>   * softlockup watchdog start and stop. The arch must select the
>   * SOFTLOCKUP_DETECTOR Kconfig.
>   */
> -int __weak watchdog_nmi_enable(unsigned int cpu)
> +void __weak watchdog_nmi_enable(unsigned int cpu)

It is __weak. spart specific implementation is in
arch/sparc/kernel/nmi.c. It has to be updated as well.

Best Regards,
Petr