lkml.org 
[lkml]   [2018]   [Jan]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [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@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?

thanks,

greg k-h

\
 
 \ /
  Last update: 2018-01-14 23:27    [W:0.041 / U:1.716 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site