From: Andi Kleen <ak@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org, Andi Kleen <andi@firstfloor.org>,
linux-toolchains@vger.kernel.org
Subject: Re: [PATCH] sched: Work around undefined behavior in sched class checking
Date: Wed, 5 May 2021 07:34:42 -0700 [thread overview]
Message-ID: <20210505143442.GR4032392@tassilo.jf.intel.com> (raw)
In-Reply-To: <YJI/OwoflyY2IXvf@hirez.programming.kicks-ass.net>
> > Use RELOC_HIDE to make this work. This hides the symbols from gcc,
> > so the optimizer won't make these assumption. I also split
> > the BUG_ONs in multiple.
>
> Urgh, that insanity again :/ Can't we pretty please get a GCC flag to
> disable that?
Even if that was done (I could totally see the gcc people pushing back on this;
why should they add special flags just for Linux developers not understanding
ISO-C?) you would still need the fix for already shipping compilers.
-Andi
next prev parent reply other threads:[~2021-05-05 14:34 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-05 3:39 [PATCH] sched: Work around undefined behavior in sched class checking Andi Kleen
2021-05-05 6:46 ` Peter Zijlstra
2021-05-05 8:47 ` Florian Weimer
2021-05-05 9:04 ` Peter Zijlstra
2021-05-05 14:39 ` Andi Kleen
2021-05-05 16:41 ` Nick Desaulniers
2021-05-05 16:48 ` Andi Kleen
2021-05-05 17:08 ` Nick Desaulniers
2021-05-05 17:20 ` Andi Kleen
2021-05-05 14:34 ` Andi Kleen [this message]
2021-05-05 15:34 ` Peter Zijlstra
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