oprofile, powerpc: Handle events that raise an exception without overflowing
authorEric B Munson <emunson@mgebm.net>
Mon, 23 May 2011 14:22:40 +0000 (10:22 -0400)
committerRobert Richter <robert.richter@amd.com>
Tue, 24 May 2011 09:26:10 +0000 (11:26 +0200)
commitd819437156fd99da61d4e1402b2dbfc5cc472265
treef7eeacffee0161139d31ec2b968b787b82bdb626
parent3d2606f42984613d324ad3047cf503bcddc3880a
oprofile, powerpc: Handle events that raise an exception without overflowing

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: Eric B Munson <emunson@mgebm.net>
Cc: <stable@kernel.org> # as far back as it applies cleanly
Tested-by: Maynard Johnson <maynardj@us.ibm.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
arch/powerpc/oprofile/op_model_power4.c