Nobody cares about the return value of watchdog_nmi_enable(),
changing its prototype to void.

This commit reworks from [1].

[1] https://lore.kernel.org/lkml/20211014024155.15253-2-kernelfans@gmail.com/
Signed-off-by: Pingfan Liu <kernelfans@gmail.com>
Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
---
 arch/sparc/kernel/nmi.c | 8 ++++----
 include/linux/nmi.h     | 2 +-
 kernel/watchdog.c       | 3 +--
 3 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/arch/sparc/kernel/nmi.c b/arch/sparc/kernel/nmi.c
index 060fff95a305..8dc0f4e820b0 100644
--- a/arch/sparc/kernel/nmi.c
+++ b/arch/sparc/kernel/nmi.c
@@ -282,11 +282,11 @@ __setup("nmi_watchdog=", setup_nmi_watchdog);
  * sparc specific NMI watchdog enable function.
  * Enables watchdog if it is not enabled already.
  */
-int watchdog_nmi_enable(unsigned int cpu)
+void watchdog_nmi_enable(unsigned int cpu)
 {
 	if (atomic_read(&nmi_active) == -1) {
 		pr_warn("NMI watchdog cannot be enabled or disabled\n");
-		return -1;
+		return;
 	}
 
 	/*
@@ -295,11 +295,11 @@ int watchdog_nmi_enable(unsigned int cpu)
 	 * process first.
 	 */
 	if (!nmi_init_done)
-		return 0;
+		return;
 
 	smp_call_function_single(cpu, start_nmi_watchdog, NULL, 1);
 
-	return 0;
+	return;
 }
 /*
  * sparc specific NMI watchdog disable function.
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 db451e943a04..b71d434cf648 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -93,10 +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)
 {
 	hardlockup_detector_perf_enable();
-	return 0;
 }
 
 void __weak watchdog_nmi_disable(unsigned int cpu)
-- 
2.25.1

On Sat 2022-02-12 18:43:46, Lecopzer Chen wrote:
> 
> Nobody cares about the return value of watchdog_nmi_enable(),
> changing its prototype to void.
> 
> --- a/arch/sparc/kernel/nmi.c
> +++ b/arch/sparc/kernel/nmi.c
> @@ -282,11 +282,11 @@ __setup("nmi_watchdog=", setup_nmi_watchdog);
>   * sparc specific NMI watchdog enable function.
>   * Enables watchdog if it is not enabled already.
>   */
> -int watchdog_nmi_enable(unsigned int cpu)
> +void watchdog_nmi_enable(unsigned int cpu)
>  {
>  	if (atomic_read(&nmi_active) == -1) {
>  		pr_warn("NMI watchdog cannot be enabled or disabled\n");
> -		return -1;
> +		return;
>  	}
>  
>  	/*
> @@ -295,11 +295,11 @@ int watchdog_nmi_enable(unsigned int cpu)
>  	 * process first.
>  	 */
>  	if (!nmi_init_done)
> -		return 0;
> +		return;
>  
>  	smp_call_function_single(cpu, start_nmi_watchdog, NULL, 1);
>  
> -	return 0;
> +	return;

Return at the end of the function is superfluous.

>  }
>  /*
>   * sparc specific NMI watchdog disable function.

Otherwise, it looks good.

Reviewed-by: Petr Mladek <pmladek@suse.com>

Best Regards,
Petr

> On Sat 2022-02-12 18:43:46, Lecopzer Chen wrote:
> > 
> > Nobody cares about the return value of watchdog_nmi_enable(),
> > changing its prototype to void.
> > 
> > --- a/arch/sparc/kernel/nmi.c
> > +++ b/arch/sparc/kernel/nmi.c
> > @@ -282,11 +282,11 @@ __setup("nmi_watchdog=", setup_nmi_watchdog);
> >   * sparc specific NMI watchdog enable function.
> >   * Enables watchdog if it is not enabled already.
> >   */
> > -int watchdog_nmi_enable(unsigned int cpu)
> > +void watchdog_nmi_enable(unsigned int cpu)
> >  {
> >  	if (atomic_read(&nmi_active) == -1) {
> >  		pr_warn("NMI watchdog cannot be enabled or disabled\n");
> > -		return -1;
> > +		return;
> >  	}
> >  
> >  	/*
> > @@ -295,11 +295,11 @@ int watchdog_nmi_enable(unsigned int cpu)
> >  	 * process first.
> >  	 */
> >  	if (!nmi_init_done)
> > -		return 0;
> > +		return;
> >  
> >  	smp_call_function_single(cpu, start_nmi_watchdog, NULL, 1);
> >  
> > -	return 0;
> > +	return;
> 
> Return at the end of the function is superfluous.

Thanks, I'll fix in the next patch.

> 
> >  }
> >  /*
> >   * sparc specific NMI watchdog disable function.
> 
> Otherwise, it looks good.
> 
> Reviewed-by: Petr Mladek <pmladek@suse.com>
>