linux-kernel - Re: [PATCH 3/6] tlb: mmu_gather: Remove unused start/end arguments from tlb_finish

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Message-ID: <CAHk-=whp=cyfq6kuVWHRbMxOak0-pJPdHsX7ghYaS6i6ETd_fQ@mail.gmail.com>
Date:   Fri, 20 Nov 2020 09:20:43 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Will Deacon <will@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Yu Zhao <yuzhao@...gle.com>, Minchan Kim <minchan@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Linux-MM <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/6] tlb: mmu_gather: Remove unused start/end arguments
 from tlb_finish_mmu()

On Fri, Nov 20, 2020 at 6:36 AM Will Deacon <will@...nel.org> wrote:
>
> tlb_finish_mmu() takes two confusing and unused 'start'/'end' address
> arguments. Remove them.

Ack, but please add the history to it.

Those arguments were used, up until 7a30df49f63a ("mm: mmu_gather:
remove __tlb_reset_range() for force flush").

And the thing is, using a range flush in theory might be better, but
for simplicity it's now doing a "fullmm" one, which is why those
arguments no longer matter.

(And I think we track the range better now too, which may be another
reason they aren't needed)

          Linus

                 Linus