- Prevent unintentional page sharing by checking whether a page

Browse source

reference to a PMU samples page has been acquired properly before that
 
 - Make sure the LBR_SELECT MSR is saved/restored too
 
 - Reset the LBR_SELECT MSR when resetting the LBR PMU to clear any
 residual data left
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Merge tag 'perf_urgent_for_v5.16_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fixes from Borislav Petkov:

 - Prevent unintentional page sharing by checking whether a page
   reference to a PMU samples page has been acquired properly before
   that

 - Make sure the LBR_SELECT MSR is saved/restored too

 - Reset the LBR_SELECT MSR when resetting the LBR PMU to clear any
   residual data left

* tag 'perf_urgent_for_v5.16_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Avoid put_page() when GUP fails
  perf/x86/vlbr: Add c->flags to vlbr event constraints
  perf/x86/lbr: Reset LBR_SELECT during vlbr reset

...

This commit is contained in:

Linus Torvalds 2021-11-14 09:33:12 -08:00

parent 1654e95ee3 4716023a8f

commit f7018be292

3 changed files with 10 additions and 6 deletions

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kernel/events/core.c

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