linux-kernel - Re: [PATCH 4/5] x86/pti: warn for unknown pti boot options

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Message-ID: <e9d8602d-bf6b-dff2-5cfa-ab6278e2f771@linux.intel.com>
Date:   Mon, 16 Jul 2018 07:34:53 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Jiang Biao <jiang.biao2@....com.cn>, tglx@...utronix.de,
        mingo@...hat.com
Cc:     luto@...nel.org, hpa@...or.com, x86@...nel.org, albcamus@...il.com,
        linux-kernel@...r.kernel.org, zhong.weidong@....com.cn
Subject: Re: [PATCH 4/5] x86/pti: warn for unknown pti boot options

On 07/15/2018 09:03 PM, Jiang Biao wrote:
> When using unknown pti boot options other than on/off/auto, we
> select auto silently, which is sometimes confusing. Add warning for
> unknown pti boot options like we do in
> spectre_v2_select_mitigation().

There's not a lot of precedent for this one.  We have gazillions of boot
options and I don't know of many places that we do this.  While this
isn't a horrible idea, I don't look forward to the patches will do this
for every other option in the kernel.