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Date: Sun, 14 Jan 2018 11:52:01 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: Greg KH <greg@kroah.com>
cc: Peter Zijlstra <peterz@infradead.org>,
        linux-kernel@vger.kernel.org, Vince Weaver <vince@deater.net>,
        torvalds@linux-foundation.org, robert@swiecki.net,
        luto@amacapital.net, mingo@kernel.org, hughd@google.com,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>
Subject: Re: [PATCH] x86,perf: Disable intel_bts when PTI
In-Reply-To: <20180114105003.GA30927@kroah.com>
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On Sun, 14 Jan 2018, Greg KH wrote:

> On Sun, Jan 14, 2018 at 11:27:13AM +0100, Peter Zijlstra wrote:
> > 
> > The intel_bts driver does not use the 'normal' BTS buffer we allocated
> > space for in the cpu_entry_area but instead uses the memory allocated
> > for the perf AUX buffer.
> > 
> > This obviously comes apart when using PTI because then the kernel
> > mapping; which includes that AUX buffer memory; disappears.
> > 
> > For now disable this driver when PTI is enabled, we'll try and sort
> > something out later.
> > 
> > Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
> > Reported-by: Vince Weaver <vincent.weaver@maine.edu>
> > Reported-by: Robert Święcki <robert@swiecki.net>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> 
> Can you add a:
> 	Cc: stable <stable@vger.kernel.org>
> please?

Already in the commit ...
--8323329-884765682-1515927122=:2371--