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Date:   Mon, 14 Nov 2022 12:28:09 -0800
From:   Andi Kleen <andi@firstfloor.org>
To:     Josh Poimboeuf <jpoimboe@kernel.org>
Cc:     "Jiri Slaby (SUSE)" <jirislaby@kernel.org>,
        linux-kernel@vger.kernel.org, Andi Kleen <andi@firstfloor.org>,
        Jiri Kosina <jikos@kernel.org>,
        Miroslav Benes <mbenes@suse.cz>,
        Petr Mladek <pmladek@suse.com>,
        Joe Lawrence <joe.lawrence@redhat.com>,
        live-patching@vger.kernel.org, Andi Kleen <ak@linux.intel.com>,
        Martin Liska <mliska@suse.cz>, Jiri Slaby <jslaby@suse.cz>
Subject: Re: [PATCH 40/46] x86/livepatch, lto: Disable live patching with gcc
 LTO
Message-ID: <20221114202808.2avu7bscqcyefbpx@two.firstfloor.org>
References: <20221114114344.18650-1-jirislaby@kernel.org>
 <20221114114344.18650-41-jirislaby@kernel.org>
 <20221114190742.qekt42gvsv2ia3ng@treble>
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On Mon, Nov 14, 2022 at 11:07:42AM -0800, Josh Poimboeuf wrote:
> On Mon, Nov 14, 2022 at 12:43:38PM +0100, Jiri Slaby (SUSE) wrote:
> > From: Andi Kleen <andi@firstfloor.org>
> > 
> > It is not supported by gcc 12 so far, so it causes compiler "sorry"
> > messages.
> 
> What specifically is not supported by GCC 12? 

-fwhole-program and the live patching options are mutually exclusive.
Okay I suppose it could be handled by disabling -fwhole-program, although 
that might limit some optimizations.

> What are the "sorry" messages?

It's an error message from the compiler telling you that something is
not implemented.


-Andi