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From: Greg KH <>
To: Peter Zijlstra <>
Cc: Thomas Gleixner <>,, Vince Weaver <>,,,,,,
	Alexander Shishkin <>
Subject: Re: [PATCH] x86,perf: Disable intel_bts when PTI
Date: Sun, 14 Jan 2018 11:50:03 +0100
Message-ID: <> (raw)
In-Reply-To: <>

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 <>
> Reported-by: Vince Weaver <>
> Reported-by: Robert Święcki <>
> Signed-off-by: Peter Zijlstra (Intel) <>

Can you add a:
	Cc: stable <>


greg k-h

  parent reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-14 10:27 Peter Zijlstra
2018-01-14 10:46 ` [tip:x86/pti] " tip-bot for Peter Zijlstra
2018-01-14 10:50 ` Greg KH [this message]
2018-01-14 10:52   ` [PATCH] " Thomas Gleixner
2018-01-14 12:54   ` Ingo Molnar
2018-01-14 13:27     ` Greg KH

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