[PATCH] arm64/smp: Remove unused irq variable in arch_show_interrupts()

[PATCH] arm64/smp: Remove unused irq variable in arch_show_interrupts()

[Geert Uytterhoeven]

    arch/arm64/kernel/smp.c: In function ‘arch_show_interrupts’:
    arch/arm64/kernel/smp.c:808:16: warning: unused variable ‘irq’ [-Wunused-variable]
      808 |   unsigned int irq = irq_desc_get_irq(ipi_desc[i]);
	  |                ^~~

The removal of the last user forgot to remove the variable.

Fixes: 2f516e34383d0e97 ("arm64/smp: Use irq_desc_kstat_cpu() in arch_show_interrupts()")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
One more issue in irq-core-2020-12-14.

 arch/arm64/kernel/smp.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 3aef3bc22d3250b5..10b39328268687e3 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -805,7 +805,6 @@ int arch_show_interrupts(struct seq_file *p, int prec)
 	unsigned int cpu, i;
 
 	for (i = 0; i < NR_IPI; i++) {
-		unsigned int irq = irq_desc_get_irq(ipi_desc[i]);
 		seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
 			   prec >= 4 ? " " : "");
 		for_each_online_cpu(cpu)
-- 
2.25.1

Re: [PATCH] arm64/smp: Remove unused irq variable in arch_show_interrupts()

[Zenghui Yu]

On 2020/12/15 18:30, Geert Uytterhoeven wrote:
>      arch/arm64/kernel/smp.c: In function ‘arch_show_interrupts’:
>      arch/arm64/kernel/smp.c:808:16: warning: unused variable ‘irq’ [-Wunused-variable]
>        808 |   unsigned int irq = irq_desc_get_irq(ipi_desc[i]);
> 	  |                ^~~
> 
> The removal of the last user forgot to remove the variable.
> 
> Fixes: 2f516e34383d0e97 ("arm64/smp: Use irq_desc_kstat_cpu() in arch_show_interrupts()")

This is in mainline now and the commit id is 5089bc51f81f.

> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
> One more issue in irq-core-2020-12-14.
> 
>   arch/arm64/kernel/smp.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
> index 3aef3bc22d3250b5..10b39328268687e3 100644
> --- a/arch/arm64/kernel/smp.c
> +++ b/arch/arm64/kernel/smp.c
> @@ -805,7 +805,6 @@ int arch_show_interrupts(struct seq_file *p, int prec)
>   	unsigned int cpu, i;
>   
>   	for (i = 0; i < NR_IPI; i++) {
> -		unsigned int irq = irq_desc_get_irq(ipi_desc[i]);
>   		seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
>   			   prec >= 4 ? " " : "");
>   		for_each_online_cpu(cpu)

And I guess we have the same problem on 32-bit ARM. 'irq' in
show_ipi_list() is no longer used since commit 88c637748e31
("ARM: smp: Use irq_desc_kstat_cpu() in show_ipi_list()").


Thanks,
Zenghui

Re: [PATCH] arm64/smp: Remove unused irq variable in arch_show_interrupts()

[Catalin Marinas]

On Tue, 15 Dec 2020 11:30:26 +0100, Geert Uytterhoeven wrote:
>     arch/arm64/kernel/smp.c: In function ‘arch_show_interrupts’:
>     arch/arm64/kernel/smp.c:808:16: warning: unused variable ‘irq’ [-Wunused-variable]
>       808 |   unsigned int irq = irq_desc_get_irq(ipi_desc[i]);
> 	  |                ^~~
> 
> The removal of the last user forgot to remove the variable.

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64/smp: Remove unused irq variable in arch_show_interrupts()
      https://git.kernel.org/arm64/c/42e85f90171a

Also adjusted the Fixes tag (before seeing that you posted a v2).

-- 
Catalin

Re: [PATCH] arm64/smp: Remove unused irq variable in arch_show_interrupts()

[Geert Uytterhoeven]

Hi Zenghui,

On Fri, Dec 25, 2020 at 8:05 AM Zenghui Yu <yuzenghui@huawei.com> wrote:
> On 2020/12/15 18:30, Geert Uytterhoeven wrote:
> >      arch/arm64/kernel/smp.c: In function ‘arch_show_interrupts’:
> >      arch/arm64/kernel/smp.c:808:16: warning: unused variable ‘irq’ [-Wunused-variable]
> >        808 |   unsigned int irq = irq_desc_get_irq(ipi_desc[i]);
> >         |                ^~~
> >
> > The removal of the last user forgot to remove the variable.
> >
> > Fixes: 2f516e34383d0e97 ("arm64/smp: Use irq_desc_kstat_cpu() in arch_show_interrupts()")
>
> This is in mainline now and the commit id is 5089bc51f81f.
>
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> > ---
> > One more issue in irq-core-2020-12-14.
> >
> >   arch/arm64/kernel/smp.c | 1 -
> >   1 file changed, 1 deletion(-)
> >
> > diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
> > index 3aef3bc22d3250b5..10b39328268687e3 100644
> > --- a/arch/arm64/kernel/smp.c
> > +++ b/arch/arm64/kernel/smp.c
> > @@ -805,7 +805,6 @@ int arch_show_interrupts(struct seq_file *p, int prec)
> >       unsigned int cpu, i;
> >
> >       for (i = 0; i < NR_IPI; i++) {
> > -             unsigned int irq = irq_desc_get_irq(ipi_desc[i]);
> >               seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
> >                          prec >= 4 ? " " : "");
> >               for_each_online_cpu(cpu)
>
> And I guess we have the same problem on 32-bit ARM. 'irq' in
> show_ipi_list() is no longer used since commit 88c637748e31
> ("ARM: smp: Use irq_desc_kstat_cpu() in show_ipi_list()").

Indeed. I didn't see it with my compiler version, but Wolfram did, and
sent a patch:
https://lore.kernel.org/linux-arm-kernel/20201228120147.59387-1-wsa+renesas@sang-engineering.com/

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds