linux-kernel - Re: drivers/gpu/drm/i915/i915.prelink.o: warning: objtool: __intel_wait_for_register_fw.cold()+0xce: relocation to !ENDBR: vlv_allow_gt

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Date:   Wed, 6 Apr 2022 09:43:30 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, mbenes@...e.cz, x86@...nel.org,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: drivers/gpu/drm/i915/i915.prelink.o: warning: objtool:
 __intel_wait_for_register_fw.cold()+0xce: relocation to !ENDBR:
 vlv_allow_gt_wake.cold+0x0

On Tue, Apr 05, 2022 at 10:32:51PM -0700, Josh Poimboeuf wrote:
> More broadly, this issue could theoretically happen in some other places
> throughout the kernel tree, since _THIS_IP_ is fundamentally unreliable
> as currently written.
> 
> So we could look at making _THIS_IP_ more predictable.
> 
> Inline asm would work better ("lea 0(%rip), %[rip]"), but then you need
> an arch-dependent implementation...

Well, there's a ton of _THIS_IP_ instances all around, and it would be
unfortunate to have them grow into actual code :/