linux-kernel - Re: [PATCHv3 1/6] atomics: add common header generation files

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Date:   Thu, 15 Nov 2018 15:10:48 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     mingo@...nel.org, arnd@...db.de, aryabinin@...tuozzo.com,
        boqun.feng@...il.com, catalin.marinas@....com, dvyukov@...gle.com,
        glider@...gle.com, linuxdrivers@...otech.com,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        will.deacon@....com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv3 1/6] atomics: add common header generation files

On Tue,  4 Sep 2018 11:48:25 +0100 Mark Rutland <mark.rutland@....com> wrote:

> To minimize repetition, to allow for future rework, and to ensure
> regularity of the various atomic APIs, we'd like to automatically
> generate (the bulk of) a number of headers related to atomics.
> 
> This patch adds the infrastructure to do so, leaving actual conversion
> of headers to subsequent patches.

This thing is appallingly slow.  `sh scripts/atomic/check-atomics.sh'
takes 8 seconds on a machine which builds an allnoconfig kernel in 30
seconds.

Um, no.  Just no.  Please find a way to make this overhead go away.