linux-kernel - Re: backport Rewrite sync_core() to use IRET-to-self to stable kernels?

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Message-ID: <20180125065057.GC24052@kroah.com>
Date:   Thu, 25 Jan 2018 07:50:57 +0100
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     "Zhang, Ning A" <ning.a.zhang@...el.com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: backport Rewrite sync_core() to use IRET-to-self to stable
 kernels?


A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

A: No.
Q: Should I include quotations after my reply?

http://daringfireball.net/2007/07/on_top

On Thu, Jan 25, 2018 at 02:22:57AM +0000, Zhang, Ning A wrote:
> When Linux runs as a guest OS, CPUID is privileged instruction, sync_core() will be very slow.
> 
> If apply this patch, 200ms will be saved for kernel initial, when Linux runs as a guest OS.

That's not a regression.  Why not just use a newer kernel release if you
want to get the feature of "faster boot"?  :)

thanks,

greg k-h