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

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Date:   Wed, 22 Dec 2021 07:27:27 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Guo Ren <guoren@...nel.org>
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



Le 22/12/2021 à 04:02, Guo Ren a écrit :
> 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.

Note that is_32bit_task() exists on powerpc, parisc and sparc.

For other ones you can still use test_thread_flag() instead of 
test_tsk_thread_flag(current)