Skip to content
Commit 28503eb7 authored by Eric B Munson's avatar Eric B Munson Committed by Herton Ronaldo Krzesinski
Browse files

powerpc/oprofile: Handle events that raise an exception without overflowing



BugLink: http://bugs.launchpad.net/bugs/802383

commit ad5d5292f16c6c1d7d3e257c4c7407594286b97e upstream.

Commit 0837e3242c73566fc1c0196b4ec61779c25ffc93 fixes a situation on POWER7
where events can roll back if a specualtive event doesn't actually complete.
This can raise a performance monitor exception.  We need to catch this to ensure
that we reset the PMC.  In all cases the PMC will be less than 256 cycles from
overflow.

This patch lifts Anton's fix for the problem in perf and applies it to oprofile
as well.

Signed-off-by: default avatarEric B Munson <emunson@mgebm.net>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: default avatarTim Gardner <tim.gardner@canonical.com>
parent ec19f454
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment