Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <0a0a3922-dc42-0c42-ecac-b63641ee07d6@suse.cz>
Date:   Tue, 15 Nov 2022 14:32:28 +0100
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.4.2
Subject: Re: [PATCH 40/46] x86/livepatch, lto: Disable live patching with gcc
 LTO
Content-Language: en-US
To:     Josh Poimboeuf <jpoimboe@kernel.org>,
        Andi Kleen <andi@firstfloor.org>
Cc:     "Jiri Slaby (SUSE)" <jirislaby@kernel.org>,
        linux-kernel@vger.kernel.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>,
        Jiri Slaby <jslaby@suse.cz>
References: <20221114114344.18650-1-jirislaby@kernel.org>
 <20221114114344.18650-41-jirislaby@kernel.org>
 <20221114190742.qekt42gvsv2ia3ng@treble>
 <20221114202808.2avu7bscqcyefbpx@two.firstfloor.org>
 <20221114220059.m44nykrau2eata42@treble>
From:   =?UTF-8?Q?Martin_Li=c5=a1ka?= <mliska@suse.cz>
In-Reply-To: <20221114220059.m44nykrau2eata42@treble>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 11/14/22 23:00, Josh Poimboeuf wrote:
> On Mon, Nov 14, 2022 at 12:28:09PM -0800, Andi Kleen wrote:
>> 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.
> 
> What live patching options are you referring to?
> 

As mentioned in the reply to the next email, we speak about:
https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-flive-patching
option:

gcc -flto -flive-patching=inline-clone a.c
cc1: sorry, unimplemented: live patching is not supported with LTO

Cheers,
Martin