netdev - Re: [PATCH] Fix initializing a static union variable

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Message-ID: <CAHk-=wiBbJLWOJxoz7srMPtKcN7+9cEh79fzf8GKXTJyRdk=tw@mail.gmail.com>
Date: Sun, 23 Jun 2024 13:05:46 -0400
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>, Yabin Cui <yabinc@...gle.com>, 
	Steffen Klassert <steffen.klassert@...unet.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Nathan Chancellor <nathan@...nel.org>, Bill Wendling <morbo@...gle.com>, 
	Justin Stitt <justinstitt@...gle.com>, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] Fix initializing a static union variable

On Sun, 23 Jun 2024 at 12:51, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> I *hope* this is some unreleased clang version that has this bug.
> Because at least the clang version I have access to (clang 17.0.6)
> does not seem to exhibit this issue.

Hmm. Strange. godbolt says that it happens with clang 17.0.1 (and
earlier) with a plain -O2.

It just doesn't happen for me. Either this got fixed already and my
17.0.6 has the fix, or there's some subtle flag that my test-case uses
(some config file - I just use "-O2" for local testing like the
godbolt page did).

But clearly godbolt does  think this happens with released clang versions too.

            Linus