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Date: Tue, 3 Feb 2015 12:25:23 +0100
From: Ingo Molnar <mingo@kernel.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: X86 ML <x86@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Sasha Levin <sasha.levin@oracle.com>,
        Paul McKenney <paulmck@linux.vnet.ibm.com>,
        Borislav Petkov <bp@alien8.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [GIT PULL] x86/asm changes for 3.20
Message-ID: <20150203112523.GC2511@gmail.com>
References: <CALCETrUL2gVU1HD74bU39FGeWNOH71+5AgE1nbQnY7tREr72EQ@mail.gmail.com>
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* Andy Lutomirski <luto@amacapital.net> wrote:

> Hi Ingo and Thomas,
> 
> Please consider pulling for x86/asm.  The sysret stuff hasn't been in
> -next, but it's been floating around for a while, and got a reasonably
> favorable reception.
> 
> If you think it's too late for the sysret stuff for 3.20, then please
> pull just "x86, traps: Fix ist_enter from userspace" instead.  It
> fixes a regression.
> 
> Thanks,
> Andy
> 
> The following changes since commit 772a9aca12567badb5b9caf2af249a5991f47ea8:
> 
>   Merge tag 'pr-20150114-x86-entry' of
> git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux into x86/asm
> (2015-01-28 15:33:26 +0100)
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git
> tags/pr-20150201-x86-entry
> 
> for you to fetch changes up to 96b6352c12711d5c0bb7157f49c92580248e8146:
> 
>   x86_64, entry: Remove the syscall exit audit and schedule
> optimizations (2015-02-01 04:03:02 -0800)
> 
> ----------------------------------------------------------------
> x86: Entry cleanups and a bugfix for 3.20
> 
> This fixes a bug in the RCU code I added in ist_enter.  It also includes
> the sysret stuff discussed here:
> 
> http://lkml.kernel.org/g/cover.1421453410.git.luto%40amacapital.net
> 
> ----------------------------------------------------------------
> Andy Lutomirski (3):
>       x86, traps: Fix ist_enter from userspace
>       x86_64, entry: Use sysret to return to userspace when possible
>       x86_64, entry: Remove the syscall exit audit and schedule optimizations
> 
>  arch/x86/kernel/entry_64.S | 106 +++++++++++++++++++++++++--------------------
>  arch/x86/kernel/traps.c    |  25 ++++++++---
>  2 files changed, 77 insertions(+), 54 deletions(-)

Pulled, thanks a lot Andy!

I'll give it some extra testing before pushing it out into -tip 
and then towards linux-next.

Thanks,

	Ingo