linux-kernel - Re: [PATCH 1/8] sched: Remove unused TASK_SIZE

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Date:   Tue, 21 Dec 2021 18:28:57 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Guo Ren <guoren@...nel.org>
Cc:     Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.or>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        inux-parisc@...r.kernel.org,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH 1/8] sched: Remove unused TASK_SIZE_OF

On Tue, Dec 21, 2021 at 6:00 PM <guoren@...nel.org> wrote:
>
> From: Guo Ren <guoren@...ux.alibaba.com>
>
> This macro isn't used in Linux, now. Delete in include/linux/sched.h
> and arch's include/asm. This would confuse people who are
> implementing the COMPAT feature for architecture.
>
> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>

It would help to list how long it has been unused for. Looking through
the git history, I see commit a06db751c321 ("pagemap: check
permissions and capabilities at open time") removing the last user.

I would normally offer to take the entire series through the asm-generic
tree, as I do for this kind of cross-architecture work. I'll probably
not have time before the merge window to pick it up though, so it
may be better to go through the architecture trees, or possibly
linux-mm for anything that fails to get picked up.

For the series:

Review-by: Arnd Bergmann <arnd@...db.de>