linux-kernel - Re: [PATCH] LoongArch: Remove MIPS comment about cycle counter

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Date:   Sat, 4 Jun 2022 14:58:08 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     WANG Xuerui <kernel@...0n.name>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] LoongArch: Remove MIPS comment about cycle counter

Hi, Xuerui and Jason,

Thank you very much, this will be applied later in the loongarch-fixes branch.

Huacai

On Sat, Jun 4, 2022 at 2:43 PM WANG Xuerui <kernel@...0n.name> wrote:
>
> On 6/4/22 14:35, Jason A. Donenfeld wrote:
> > This comment block was taken originally from the MIPS architecture code,
> > where indeed there are particular assumptions one can make regarding SMP
> > and !SMP and cycle counters. On LoongArch, however, the rdtime family of
> > functions is always available. As Xuerui wrote:
> >
> >      The rdtime family of instructions is in fact guaranteed to be
> >      available on LoongArch; LoongArch's subsets all contain them, even
> >      the 32-bit "Primary" subset intended for university teaching -- they
> >      provide the rdtimeh.w and rdtimel.w pair of instructions that access
> >      the same 64-bit counter.
> >
> > So this commit simply removes the incorrect comment block.
> >
> > Link: https://lore.kernel.org/lkml/e78940bc-9be2-2fe7-026f-9e64a1416c9f@xen0n.name/
> > Fixes: b738c106f735 ("LoongArch: Add other common headers")
> > Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> > ---
> >   arch/loongarch/include/asm/timex.h | 7 -------
> >   1 file changed, 7 deletions(-)
> >
> > diff --git a/arch/loongarch/include/asm/timex.h b/arch/loongarch/include/asm/timex.h
> > index d3ed99a4fdbd..fb41e9e7a222 100644
> > --- a/arch/loongarch/include/asm/timex.h
> > +++ b/arch/loongarch/include/asm/timex.h
> > @@ -12,13 +12,6 @@
> >   #include <asm/cpu.h>
> >   #include <asm/cpu-features.h>
> >
> > -/*
> > - * Standard way to access the cycle counter.
> > - * Currently only used on SMP for scheduling.
> > - *
> > - * We know that all SMP capable CPUs have cycle counters.
> > - */
> > -
> >   typedef unsigned long cycles_t;
> >
> >   #define get_cycles get_cycles
>
> Just as previously discussed. Thanks for the quick fixup!
>
> Reviewed-by: WANG Xuerui <git@...0n.name>