linux-kernel - Re: [PATCH 4/8] sched: powerpc: Remove unused TASK_SIZE

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Date:   Wed, 22 Dec 2021 11:02:36 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     "will@...nel.org" <will@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "juri.lelli@...hat.com" <juri.lelli@...hat.com>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        Guo Ren <guoren@...ux.alibaba.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "sparclinux@...r.kernel.or" <sparclinux@...r.kernel.or>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "inux-parisc@...r.kernel.org" <inux-parisc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 4/8] sched: powerpc: Remove unused TASK_SIZE_OF

On Wed, Dec 22, 2021 at 2:43 AM Christophe Leroy
<christophe.leroy@...roup.eu> wrote:
>
>
>
> Le 21/12/2021 à 18:00, guoren@...nel.org a écrit :
> > From: Guo Ren <guoren@...ux.alibaba.com>
> >
> > This macro isn't used in Linux sched, now. Delete in
> > include/linux/sched.h and arch's include/asm.
> >
> > Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> > ---
> >   arch/powerpc/include/asm/task_size_64.h | 6 ++----
> >   1 file changed, 2 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/powerpc/include/asm/task_size_64.h b/arch/powerpc/include/asm/task_size_64.h
> > index c993482237ed..7e2eca4fac4d 100644
> > --- a/arch/powerpc/include/asm/task_size_64.h
> > +++ b/arch/powerpc/include/asm/task_size_64.h
> > @@ -44,12 +44,10 @@
> >    */
> >   #define TASK_SIZE_USER32 (0x0000000100000000UL - (1 * PAGE_SIZE))
> >
> > -#define TASK_SIZE_OF(tsk)                                            \
> > -     (test_tsk_thread_flag(tsk, TIF_32BIT) ? TASK_SIZE_USER32 :      \
> > +#define TASK_SIZE                                                    \
> > +     (test_tsk_thread_flag(current, TIF_32BIT) ? TASK_SIZE_USER32 :  \
> >                                               TASK_SIZE_USER64)
>
> I think you should use test_thread_flag() instead.
>
> Or even better: use is_32bit_task() and bring back this macro as a
> single line, something like:
>
> #define TASK_SIZE (is_32bit_task() ? TASK_SIZE_USER32 : TASK_SIZE_USER64)
Okay, looks better. I would fix it in the next version.

>
> >
> > -#define TASK_SIZE TASK_SIZE_OF(current)
> > -
> >   #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
> >   #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(DEFAULT_MAP_WINDOW_USER64 / 4))
> >
> >



-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/