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Message-Id: <20100330224751.508527804@linux.site>
Date: Tue, 30 Mar 2010 15:41:23 -0700
From: Greg KH <gregkh@...e.de>
To: linux-kernel@...r.kernel.org, stable@...nel.org,
Greg KH <greg@...ah.com>
Cc: stable-review@...nel.org, torvalds@...ux-foundation.org,
akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
Jean Pihet <jpihet@...sta.com>,
Frederic Weisbecker <fweisbec@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Jamie Iles <jamie.iles@...ochip.com>,
Paul Mackerras <paulus@...ba.org>,
Stephane Eranian <eranian@...gle.com>,
Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Greg Kroah-Hartman <gregkh@...e.de>
Subject: [049/156] perf: Provide generic perf_sample_data initialization
2.6.33-stable review patch. If anyone has any objections, please let us know.
------------------
From: Peter Zijlstra <peterz@...radead.org>
This makes it easier to extend perf_sample_data and fixes a bug on arm
and sparc, which failed to set ->raw to NULL, which can cause crashes
when combined with PERF_SAMPLE_RAW.
It also optimizes PowerPC and tracepoint, because the struct
initialization is forced to zero out the whole structure.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Acked-by: Jean Pihet <jpihet@...sta.com>
Reviewed-by: Frederic Weisbecker <fweisbec@...il.com>
Acked-by: David S. Miller <davem@...emloft.net>
Cc: Jamie Iles <jamie.iles@...ochip.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Stephane Eranian <eranian@...gle.com>
LKML-Reference: <20100304140100.315416040@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
arch/powerpc/kernel/perf_event.c | 8 ++++----
arch/sparc/kernel/perf_event.c | 2 +-
arch/x86/kernel/cpu/perf_event.c | 9 +++------
include/linux/perf_event.h | 7 +++++++
kernel/perf_event.c | 21 ++++++++-------------
5 files changed, 23 insertions(+), 24 deletions(-)
--- a/arch/powerpc/kernel/perf_event.c
+++ b/arch/powerpc/kernel/perf_event.c
@@ -1164,10 +1164,10 @@ static void record_and_restart(struct pe
* Finally record data if requested.
*/
if (record) {
- struct perf_sample_data data = {
- .addr = ~0ULL,
- .period = event->hw.last_period,
- };
+ struct perf_sample_data data;
+
+ perf_sample_data_init(&data, ~0ULL);
+ data.period = event->hw.last_period;
if (event->attr.sample_type & PERF_SAMPLE_ADDR)
perf_get_data_addr(regs, &data.addr);
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -1189,7 +1189,7 @@ static int __kprobes perf_event_nmi_hand
regs = args->regs;
- data.addr = 0;
+ perf_sample_data_init(&data, 0);
cpuc = &__get_cpu_var(cpu_hw_events);
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1636,10 +1636,9 @@ static void intel_pmu_drain_bts_buffer(s
ds->bts_index = ds->bts_buffer_base;
+ perf_sample_data_init(&data, 0);
data.period = event->hw.last_period;
- data.addr = 0;
- data.raw = NULL;
regs.ip = 0;
/*
@@ -1756,8 +1755,7 @@ static int p6_pmu_handle_irq(struct pt_r
int idx, handled = 0;
u64 val;
- data.addr = 0;
- data.raw = NULL;
+ perf_sample_data_init(&data, 0);
cpuc = &__get_cpu_var(cpu_hw_events);
@@ -1802,8 +1800,7 @@ static int intel_pmu_handle_irq(struct p
int bit, loops;
u64 ack, status;
- data.addr = 0;
- data.raw = NULL;
+ perf_sample_data_init(&data, 0);
cpuc = &__get_cpu_var(cpu_hw_events);
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -793,6 +793,13 @@ struct perf_sample_data {
struct perf_raw_record *raw;
};
+static inline
+void perf_sample_data_init(struct perf_sample_data *data, u64 addr)
+{
+ data->addr = addr;
+ data->raw = NULL;
+}
+
extern void perf_output_sample(struct perf_output_handle *handle,
struct perf_event_header *header,
struct perf_sample_data *data,
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4027,8 +4027,7 @@ void __perf_sw_event(u32 event_id, u64 n
if (rctx < 0)
return;
- data.addr = addr;
- data.raw = NULL;
+ perf_sample_data_init(&data, addr);
do_perf_sw_event(PERF_TYPE_SOFTWARE, event_id, nr, nmi, &data, regs);
@@ -4073,11 +4072,10 @@ static enum hrtimer_restart perf_swevent
struct perf_event *event;
u64 period;
- event = container_of(hrtimer, struct perf_event, hw.hrtimer);
+ event = container_of(hrtimer, struct perf_event, hw.hrtimer);
event->pmu->read(event);
- data.addr = 0;
- data.raw = NULL;
+ perf_sample_data_init(&data, 0);
data.period = event->hw.last_period;
regs = get_irq_regs();
/*
@@ -4241,17 +4239,15 @@ static const struct pmu perf_ops_task_cl
void perf_tp_event(int event_id, u64 addr, u64 count, void *record,
int entry_size)
{
+ struct pt_regs *regs = get_irq_regs();
+ struct perf_sample_data data;
struct perf_raw_record raw = {
.size = entry_size,
.data = record,
};
- struct perf_sample_data data = {
- .addr = addr,
- .raw = &raw,
- };
-
- struct pt_regs *regs = get_irq_regs();
+ perf_sample_data_init(&data, addr);
+ data.raw = &raw;
if (!regs)
regs = task_pt_regs(current);
@@ -4367,8 +4363,7 @@ void perf_bp_event(struct perf_event *bp
struct perf_sample_data sample;
struct pt_regs *regs = data;
- sample.raw = NULL;
- sample.addr = bp->attr.bp_addr;
+ perf_sample_data_init(&sample, bp->attr.bp_addr);
if (!perf_exclude_event(bp, regs))
perf_swevent_add(bp, 1, 1, &sample, regs);
--
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