linux-kernel - Re: [RFC] Improving udelay/ndelay on platforms where that is possible

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Message-ID: <CAD=FV=V3n0gjzpL860V6cgf8JVh5pmoL+i0t63Oot19T2afTPw@mail.gmail.com>
Date:   Tue, 31 Oct 2017 17:23:19 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Marc Gonzalez <marc_gonzalez@...madesigns.com>,
        Mark Rutland <mark.rutland@....com>, Mason <slash.tmp@...e.fr>,
        Jonathan Austin <jonathan.austin@....com>,
        Arnd Bergmann <arnd@...db.de>, Nicolas Pitre <nico@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Michael Turquette <mturquette@...libre.com>,
        Kevin Hilman <khilman@...nel.org>,
        Will Deacon <will.deacon@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC] Improving udelay/ndelay on platforms where that is possible

Hi,

On Tue, Oct 31, 2017 at 10:45 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> So I'm very much open to udelay improvements, and if somebody sends
> patches for particular platforms to do particularly well on that
> platform, I think we should merge them. But ...

If I'm reading this all correctly, this sounds like you'd be willing
to merge <https://patchwork.kernel.org/patch/9429841/>.  This makes
udelay() guaranteed not to underrun on arm32 platforms.

-Doug