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Date:   Wed, 20 Jul 2022 23:47:02 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Justin Forbes <jforbes@fedoraproject.org>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Jiri Slaby <jslaby@suse.cz>,
        Naresh Kamboju <naresh.kamboju@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        stable <stable@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Shuah Khan <shuah@kernel.org>, patches@kernelci.org,
        lkft-triage@lists.linaro.org, Pavel Machek <pavel@denx.de>,
        Jon Hunter <jonathanh@nvidia.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Sudip Mukherjee <sudipm.mukherjee@gmail.com>,
        Slade Watkins <slade@sladewatkins.com>,
        John Harrison <John.C.Harrison@intel.com>,
        Tejas Upadhyay <tejas.upadhyay@intel.com>,
        Anusha Srivatsa <anusha.srivatsa@intel.com>,
        Jani Nikula <jani.nikula@intel.com>,
        Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Subject: Re: [PATCH 5.18 000/231] 5.18.13-rc1 review
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On Wed, Jul 20, 2022 at 12:57:26PM -0500, Justin Forbes wrote:
> On Wed, Jul 20, 2022 at 10:28:33AM -0700, Linus Torvalds wrote:
> > [ Adding PeterZ and Jiri to the participants. ]
> > 
> > Looks like 5.18.13 added that commit 9bb2ec608a20 ("objtool: Update
> > Retpoline validation") but I don't see 3131ef39fb03 ("x86/asm/32: Fix
> > ANNOTATE_UNRET_SAFE use on 32-bit") in that list.
> 
> It should be noted that the build doesn't fail, it just warns.
> I am guessing the 32bit failure is what promoted someone to look at
> the logs to begin with and notice the warn initially. I just verified
> that it exists in our builds of 5.18.13-rc1, but not on mainline builds.
> I am gueesing it is because commit 9bb2ec608a20 ("objtool: Update Retpoline
> validation") should be followed up with at least commit f43b9876e857c
> ("x86/retbleed: Add fine grained Kconfig knobs")

Still updateing the stable repro to see what the actual code looks like,
but that warning seems to suggest the -mfunction-return=thunk-extern
compiler argument went missing.

For all the files objtool complains about, does the V=1 build output
show that option?