linux-kernel - Re: [PATCH] kcsan, compiler_types: avoid duplicate type issues in BPF Type Format

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Message-ID: <CANpmjNNnMiUd4eb05fXCndJTd_WB9TRB_O0AB9+C4BCgrF3ZDw@mail.gmail.com>
Date: Wed, 28 Jan 2026 02:44:57 +0100
From: Marco Elver <elver@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Alan Maguire <alan.maguire@...cle.com>, kees@...nel.org, nathan@...nel.org, 
	peterz@...radead.org, ojeda@...nel.org, ubizjak@...il.com, Jason@...c4.com, 
	Marc.Herbert@...ux.intel.com, hca@...ux.ibm.com, hpa@...or.com, 
	namjain@...ux.microsoft.com, paulmck@...nel.org, linux-kernel@...r.kernel.org, 
	andrii.nakryiko@...il.com, yonghong.song@...ux.dev, ast@...nel.org, 
	jolsa@...nel.org, daniel@...earbox.net, martin.lau@...ux.dev, 
	eddyz87@...il.com, song@...nel.org, john.fastabend@...il.com, 
	kpsingh@...nel.org, sdf@...ichev.me, haoluo@...gle.com, bvanassche@....org, 
	nilay@...ux.ibm.com, bpf@...r.kernel.org
Subject: Re: [PATCH] kcsan, compiler_types: avoid duplicate type issues in BPF
 Type Format

On Wed, 28 Jan 2026 at 00:31, Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Wed, 28 Jan 2026 00:08:10 +0100 Marco Elver <elver@...gle.com> wrote:
>
> > > "KCSAN and KCSAN_SANITIZE objects" doesn't make sense.
> > > "KCSAN_SANITIZE.. := n" objects?
> > > Or just "instrumented and uninstrumented source files".
> > > Anyway, I know what you mean, but others might not. :-)
> > >
> > > > Fixes: 31f605a308e6 ("kcsan, compiler_types: Introduce __data_racy type qualifier")
> > > > Reported-by: Nilay Shroff <nilay@...ux.ibm.com>
> > > > Suggested-by: Marco Elver <elver@...gle.com>
> > > > Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
> > >
> > > Reviewed-by: Marco Elver <elver@...gle.com>
> >
> > Which tree do compiler_types.h changes go through these days?
>
> Thanks for poking.
>
> compiler_types.h appears to be a free-for-all.  It's best to view such
> a thing as a KCSAN patch rather than a compiler_types.h patch - that
> the patch affects compiler_types.h is incidental.

I wasn't quite sure, given the conflict potential for this file - but
next time I'd take it through the kcsan tree then. This time around,
please continue to carry it.

> 31f605a308e6 came in via paulmck so convention (which perhaps only I
> maintain) says "Paul", but whatever - getting the fix merged is the
> important part.
>
> So I'll grab Alan's patch, shall drop if it pops up in -next via a
> different route.   Aiming for upstreaming in the next merge window.

Thanks!

> It's unclear whether a -stable backport is required.  Thoughts on this
> are sought.

I think it'd be appropriate!