unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
1
Fork 0
Code Pull requests 5 Wiki Activity

perf, x86: Report error code that returned from x86_pmu.hw_config()

Browse source 
If x86_pmu.hw_config() fails a fixed error code (-EOPNOTSUPP) is
returned even if a different error was reported. This patch fixes
this.

Signed-off-by: Robert Richter <robert.richter@amd.com>
Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Acked-by: Lin Ming <ming.m.lin@intel.com>
Cc: acme@redhat.com
Cc: eranian@google.com
Cc: gorcunov@openvz.org
Cc: peterz@infradead.org
Cc: fweisbec@gmail.com
LKML-Reference: <20100316160733.GR1585@erda.amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Robert Richter 2010-03-16 17:07:33 +01:00 committed by Ingo Molnar
parent 5cc718b9da
commit 984763cb90
1 changed files with 3 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
arch/x86/kernel/cpu/perf_event.c
View file

@ -472,8 +472,9 @@ static int __hw_perf_event_init(struct perf_event *event)
hwc->last_tag = ~0ULL;
/* Processor specifics */
if (x86_pmu.hw_config(attr, hwc))
return -EOPNOTSUPP;
err = x86_pmu.hw_config(attr, hwc);
if (err)
return err;
if (!hwc->sample_period) {
hwc->sample_period = x86_pmu.max_period;