Merge branch 'perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic...

diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c
index ff15c9d..42c5942 100644 (file)
--- a/arch/x86/kernel/hw_breakpoint.c
+++ b/arch/x86/kernel/hw_breakpoint.c
@@ -433,6 +433,10 @@ static int __kprobes hw_breakpoint_handler(struct die_args *args)
        dr6_p = (unsigned long *)ERR_PTR(args->err);
        dr6 = *dr6_p;
 
+       /* If it's a single step, TRAP bits are random */
+       if (dr6 & DR_STEP)
+               return NOTIFY_DONE;
+
        /* Do an early return if no trap bits are set in DR6 */
        if ((dr6 & DR_TRAP_BITS) == 0)
                return NOTIFY_DONE;

diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h
index a2d6ea4..d1e55fe 100644 (file)
--- a/include/linux/hw_breakpoint.h
+++ b/include/linux/hw_breakpoint.h
@@ -33,6 +33,8 @@ enum bp_type_idx {
 
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 
+extern int __init init_hw_breakpoint(void);
+
 static inline void hw_breakpoint_init(struct perf_event_attr *attr)
 {
        memset(attr, 0, sizeof(*attr));
@@ -108,6 +110,8 @@ static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
 
 #else /* !CONFIG_HAVE_HW_BREAKPOINT */
 
+static inline int __init init_hw_breakpoint(void) { return 0; }
+
 static inline struct perf_event *
 register_user_hw_breakpoint(struct perf_event_attr *attr,
                            perf_overflow_handler_t triggered,

diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index 2c9120f..e532582 100644 (file)
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -620,7 +620,7 @@ static struct pmu perf_breakpoint = {
        .read           = hw_breakpoint_pmu_read,
 };
 
-static int __init init_hw_breakpoint(void)
+int __init init_hw_breakpoint(void)
 {
        unsigned int **task_bp_pinned;
        int cpu, err_cpu;
@@ -655,6 +655,5 @@ static int __init init_hw_breakpoint(void)
 
        return -ENOMEM;
 }
-core_initcall(init_hw_breakpoint);
 
 

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index cb6c0d2..f818d9d 100644 (file)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -31,6 +31,7 @@
 #include <linux/kernel_stat.h>
 #include <linux/perf_event.h>
 #include <linux/ftrace_event.h>
+#include <linux/hw_breakpoint.h>
 
 #include <asm/irq_regs.h>
 
@@ -6321,6 +6322,8 @@ perf_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu)
 
 void __init perf_event_init(void)
 {
+       int ret;
+
        perf_event_init_all_cpus();
        init_srcu_struct(&pmus_srcu);
        perf_pmu_register(&perf_swevent);
@@ -6328,4 +6331,7 @@ void __init perf_event_init(void)
        perf_pmu_register(&perf_task_clock);
        perf_tp_register();
        perf_cpu_notifier(perf_cpu_notify);
+
+       ret = init_hw_breakpoint();
+       WARN(ret, "hw_breakpoint initialization failed with: %d", ret);
 }