On 07/25/2014 10:05 PM, Nicolas Pitre wrote:
The strings used to list IPIs in /proc/interrupts are reused for tracing purposes.
While at it, prevent a negative ipinr from escaping the range check in handle_IPI().
Signed-off-by: Nicolas Pitre nico@linaro.org Acked-by: Steven Rostedt rostedt@goodmis.org
Acked-by: Daniel Lezcano daniel.lezcano@linaro.org
arch/arm/kernel/smp.c | 70 ++++++++++++++++++++++++++++++--------------------- 1 file changed, 42 insertions(+), 28 deletions(-)
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 7c4fada440..9388a3d479 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -47,6 +47,9 @@ #include <asm/mach/arch.h> #include <asm/mpu.h>
+#define CREATE_TRACE_POINTS +#include <trace/events/ipi.h>
- /*
- as from 2.5, kernels no longer have an init_tasks structure
- so we need some other way of telling a new secondary core
@@ -430,38 +433,15 @@ void __init smp_prepare_cpus(unsigned int max_cpus) } }
-static void (*smp_cross_call)(const struct cpumask *, unsigned int); +static void (*__smp_cross_call)(const struct cpumask *, unsigned int);
void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int)) {
- if (!smp_cross_call)
smp_cross_call = fn;-}
-void arch_send_call_function_ipi_mask(const struct cpumask *mask) -{
- smp_cross_call(mask, IPI_CALL_FUNC);
-}
-void arch_send_wakeup_ipi_mask(const struct cpumask *mask) -{
- smp_cross_call(mask, IPI_WAKEUP);
-}
-void arch_send_call_function_single_ipi(int cpu) -{
- smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
- if (!__smp_cross_call)
__smp_cross_call = fn;-#ifdef CONFIG_IRQ_WORK -void arch_irq_work_raise(void) -{
- if (is_smp())
smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);-} -#endif
-static const char *ipi_types[NR_IPI] = { +static const char *ipi_types[NR_IPI] __tracepoint_string = { #define S(x,s) [x] = s S(IPI_WAKEUP, "CPU wakeup interrupts"), S(IPI_TIMER, "Timer broadcast interrupts"), @@ -473,6 +453,12 @@ static const char *ipi_types[NR_IPI] = { S(IPI_COMPLETION, "completion interrupts"), };
+static void smp_cross_call(const struct cpumask *target, unsigned int ipinr) +{
- trace_ipi_raise(target, ipi_types[ipinr]);
- __smp_cross_call(target, ipinr);
+}
- void show_ipi_list(struct seq_file *p, int prec) { unsigned int cpu, i;
@@ -499,6 +485,29 @@ u64 smp_irq_stat_cpu(unsigned int cpu) return sum; }
+void arch_send_call_function_ipi_mask(const struct cpumask *mask) +{
- smp_cross_call(mask, IPI_CALL_FUNC);
+}
+void arch_send_wakeup_ipi_mask(const struct cpumask *mask) +{
- smp_cross_call(mask, IPI_WAKEUP);
+}
+void arch_send_call_function_single_ipi(int cpu) +{
- smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
+}
+#ifdef CONFIG_IRQ_WORK +void arch_irq_work_raise(void) +{
- if (is_smp())
smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);+} +#endif
- #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST void tick_broadcast(const struct cpumask *mask) {
@@ -556,8 +565,10 @@ void handle_IPI(int ipinr, struct pt_regs *regs) unsigned int cpu = smp_processor_id(); struct pt_regs *old_regs = set_irq_regs(regs);
- if (ipinr < NR_IPI)
if ((unsigned)ipinr < NR_IPI) {
trace_ipi_entry(ipi_types[ipinr]);__inc_irq_stat(cpu, ipi_irqs[ipinr]);
}
switch (ipinr) { case IPI_WAKEUP:
@@ -612,6 +623,9 @@ void handle_IPI(int ipinr, struct pt_regs *regs) cpu, ipinr); break; }
- if ((unsigned)ipinr < NR_IPI)
trace_ipi_exit(ipi_types[ipinr]);