linux-kernel - RE: [PATCH v2] sched: Optimize __calc

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Message-ID: <b28c85f973f34bc192b5b5e95f43a7fb@AcuMS.aculab.com>
Date:   Fri, 5 Mar 2021 17:13:26 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Nick Desaulniers' <ndesaulniers@...gle.com>,
        Josh Don <joshdon@...gle.com>
CC:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>,
        "Mel Gorman" <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Clement Courbet <courbet@...gle.com>,
        Oleg Rombakh <olegrom@...gle.com>,
        Bill Wendling <morbo@...gle.com>
Subject: RE: [PATCH v2] sched: Optimize __calc_delta.

> Hi Josh, Thanks for helping get this patch across the finish line.
> Would you mind updating the commit message to point to
> https://bugs.llvm.org/show_bug.cgi?id=20197?

Is it worth an audit of all the asm() constraints
and potentially changing all the "mr" to "r" for clang?

The explicit 'load into a register' won't make much
difference even if a direct "m" operand could be used on x86.

	David

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