linux-kernel - Re: [PATCH] locking/atomics: build atomic headers as required

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Message-ID: <20181123154835.63mkqlkn4eppegil@lakrids.cambridge.arm.com>
Date:   Fri, 23 Nov 2018 15:48:36 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        mingo@...nel.org
Cc:     Boqun Feng <boqun.feng@...il.com>, Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will.deacon@....com>
Subject: Re: [PATCH] locking/atomics: build atomic headers as required

On Fri, Nov 23, 2018 at 03:33:21PM +0000, Mark Rutland wrote:
> Andrew and Ingo report that the check-atomics.sh script is simply too
> slow to run for every kernel build, and it's impractical to make it
> faster without rewriting it in something other than shell.
> 
> Rather than committing the generated headers, let's regenerate these
> as-required for a pristine tree.

> The diffstat looks nice, at least...

>  include/asm-generic/atomic-instrumented.h | 1787 ----------------------
>  include/asm-generic/atomic-long.h         | 1012 -------------
>  include/linux/atomic-fallback.h           | 2294 -----------------------------

As a heads-up, I generated the diff with git format-patch -D, to omit
the preimage for those ~5000 lines being deleted. Unfortunately, git-am
will refuse to apply that, with something like:

| error: removal patch leaves file contents
| error: include/asm-generic/atomic-instrumented.h: patch does not apply

I've pushed the patch to my atomics/regenerate branch [1] for now. I can resend
with the full context (or leaving the stale files for a subsequent deletion),
if that's preferable?

Thanks,
Mark.

[1] git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git atomics/regenerate