linux-kernel - Re: [PATCH 6/6] x86/gsseg: use the LKGS instruction if available for load_gs

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Date:   Fri, 7 Oct 2022 13:33:11 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     "Li, Xin3" <xin3.li@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH 6/6] x86/gsseg: use the LKGS instruction if available for
 load_gs_index()

On 10/7/22 13:23, Peter Zijlstra wrote:
>>
>> Perhaps the two of you need to compare confugurations?
> 
> Whatever for? I know the robots report this warning because there was
> one from the KVM cross-merge when the .fixup removal went in. It got
> reported and fixed and that was the last of it.
> 

To help track down what appears to be a problem?

> Anyway; try:
> 
>    $ git grep "\.fixup" arch/x86/
> 
> there isn't a single usage.
> 
> Andrew Cooper suggested upgrading the orphan section warning to a hard
> link error, orphan sections are bad regardless.
> 

Agreed 1000%. This is a no-brainer. From IRC:


<andyhhp> -LDFLAGS_vmlinux += --orphan-handling=warn
<andyhhp> +LDFLAGS_vmlinux += --orphan-handling=error

	-hpa