From: "H. Peter Anvin" <hpa@zytor.com>
To: Borislav Petkov <bp@alien8.de>
Cc: X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86: Kill some chicken bits
Date: Wed, 21 Oct 2015 01:09:12 -0700 [thread overview]
Message-ID: <56274828.6020909@zytor.com> (raw)
In-Reply-To: <20151020170457.GF31130@pd.tnic>
On 10/20/2015 10:04 AM, Borislav Petkov wrote:
> On Tue, Oct 20, 2015 at 09:58:18AM -0700, H. Peter Anvin wrote:
>> I would like to keep nosmap until SMAP hardware is more ubiquitous
>> since SMAP is vulnerable to kernel bugs. We have already had a case
>> where a maintainer pushed "cleanup" code straight to Linus, bypassing
>> the x86 maintainers, which broke booting on SMAP hardware.
>
> Right, so the thought came to my mind while going through those, that we
> don't really know what they're going to be good for and what we're going
> to need them for in the future. So maybe we want to keep them after all
> - you never know.
>
> For example, luto made me use "nosep" recently even though that's an
> ancient chicken bit.
>
> So maybe we want to not remove them ever - the cleanup win is not that
> great to even care...
>
Some chicken bits may be better than others, though.
-hpa
prev parent reply other threads:[~2015-10-21 8:09 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-20 16:33 [PATCH] x86: Kill some chicken bits Borislav Petkov
2015-10-20 16:58 ` H. Peter Anvin
2015-10-20 17:04 ` Borislav Petkov
2015-10-21 8:09 ` H. Peter Anvin [this message]
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