linux-kernel - Re: [PATCH -next] cpuidle: riscv: support non-SMP config

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Date:   Mon, 4 Apr 2022 09:08:25 +0530
From:   Anup Patel <anup@...infault.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        kernel test robot <lkp@...el.com>,
        Anup Patel <apatel@...tanamicro.com>,
        Atish Patra <atishp@...osinc.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH -next] cpuidle: riscv: support non-SMP config

On Mon, Apr 4, 2022 at 9:07 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>
>
>
> On 4/3/22 20:05, Anup Patel wrote:
> > (Removed my WDC email because it does not exist anymore)
> >
> > On Sun, Apr 3, 2022 at 8:44 AM Randy Dunlap <rdunlap@...radead.org> wrote:
> >>
> >> Add <asm/smp.h> for cpuid_to_hartid_map etc.
> >> This is needed for both SMP and non-SMP builds, but not having it
> >> causes a build error for non-SMP:
> >>
> >> drivers/cpuidle/cpuidle-riscv-sbi.c: In function 'sbi_cpuidle_init_cpu':
> >> drivers/cpuidle/cpuidle-riscv-sbi.c:350:26: error: implicit declaration of function 'cpuid_to_hartid_map' [-Werror=implicit-function-declaration]
> >>
> >> Fixes: 6abf32f1d9c5 ("cpuidle: Add RISC-V SBI CPU idle driver")
> >> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> >> Reported-by: kernel test robot <lkp@...el.com>
> >> Cc: Anup Patel <anup.patel@....com>
> >> Cc: Anup Patel <anup@...infault.org>
> >> Cc: Anup Patel <apatel@...tanamicro.com>
> >> Cc: Atish Patra <atishp@...osinc.com>
> >> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> >> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> >> Cc: linux-pm@...r.kernel.org
> >> Cc: linux-riscv@...ts.infradead.org
> >> Cc: Palmer Dabbelt <palmer@...osinc.com>
> >> Cc: Paul Walmsley <paul.walmsley@...ive.com>
> >> Cc: Albert Ou <aou@...s.berkeley.edu>
> >> ---
> >>  drivers/cpuidle/cpuidle-riscv-sbi.c |    1 +
> >>  1 file changed, 1 insertion(+)
> >>
> >> --- linux-next-20220401.orig/drivers/cpuidle/cpuidle-riscv-sbi.c
> >> +++ linux-next-20220401/drivers/cpuidle/cpuidle-riscv-sbi.c
> >> @@ -22,6 +22,7 @@
> >>  #include <linux/pm_runtime.h>
> >>  #include <asm/cpuidle.h>
> >>  #include <asm/sbi.h>
> >> +#include <asm/smp.h>
> >
> > I suggest include linux/smp.h here instead of asm/smp.h
> >
> > Otherwise it looks good to me.
> >
> > Reviewed-by: Anup Patel <anup@...infault.org>
> >
>
> Yeah, checkpatch also suggested that but it does not work.
> Yes, I tested it.
>
> linux/smp.h only #includes <asm/smp.h> if CONFIG_SMP is enabled,
> and this patch needs <asm/smp.h> for the non-SMP case.

Okay, sounds good to me.

No changes needed in this patch.

Regards,
Anup

>
> >
> >>  #include <asm/suspend.h>
> >>
> >>  #include "dt_idle_states.h"
>
> thanks.
> --
> ~Randy