linux-kernel - Re: [PATCH] x86,perf: Disable intel

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Message-ID: <20180114105003.GA30927@kroah.com>
Date:   Sun, 14 Jan 2018 11:50:03 +0100
From:   Greg KH <greg@...ah.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        Vince Weaver <vince@...ter.net>, torvalds@...ux-foundation.org,
        robert@...ecki.net, luto@...capital.net, mingo@...nel.org,
        hughd@...gle.com,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: Re: [PATCH] x86,perf: Disable intel_bts when PTI

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@...ux.intel.com>
> Reported-by: Vince Weaver <vincent.weaver@...ne.edu>
> Reported-by: Robert Święcki <robert@...ecki.net>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Can you add a:
	Cc: stable <stable@...r.kernel.org>
please?

thanks,

greg k-h