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Message-ID: <YBAyGU7H8E98xKng@hirez.programming.kicks-ass.net> Date: Tue, 26 Jan 2021 16:15:37 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Josh Poimboeuf <jpoimboe@...hat.com> Cc: Greg KH <greg@...ah.com>, Justin Forbes <jforbes@...hat.com>, Masahiro Yamada <masahiroy@...nel.org>, Kees Cook <keescook@...omium.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Michal Marek <michal.lkml@...kovi.net>, linux-hardening@...r.kernel.org, Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>, Ondrej Mosnacek <omosnace@...hat.com> Subject: Re: [PATCH RFC] gcc-plugins: Handle GCC version mismatch for OOT modules On Tue, Jan 26, 2021 at 08:51:55AM -0600, Josh Poimboeuf wrote: > User space mixes compiler versions all the time. The C ABI is stable. > > What specifically is the harder issue you're referring to? I don't think the C ABI captures nearly enough. Imagine trying to mix a compiler with and without asm-goto support (ok, we fail to build without by now, but just imagine). No C ABI violated, but having that GCC extention vs not having it radically changes the kernel ABI. I think I'm with Greg here, just don't do it.
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