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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull perf fixes from Ingo Molnar:
 "Two kernel side fixes:

   - an Intel uncore PMU driver potential crash fix
   - a kprobes/perf-call-graph interaction fix"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel: Use rdmsrl_safe() when initializing RAPL PMU
  kprobes/x86: Fix page-fault handling logic
This commit is contained in:
Linus Torvalds 2014-04-19 10:40:11 -07:00
commit 8de3f7a705
2 changed files with 16 additions and 12 deletions
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12
arch/x86/kernel/cpu/perf_event_intel_rapl.c
View File

@ -535,6 +535,7 @@ static int rapl_cpu_prepare(int cpu)
struct rapl_pmu *pmu = per_cpu(rapl_pmu, cpu);
int phys_id = topology_physical_package_id(cpu);
u64 ms;
u64 msr_rapl_power_unit_bits;
if (pmu)
return 0;
@ -542,6 +543,9 @@ static int rapl_cpu_prepare(int cpu)
if (phys_id < 0)
return -1;
if (!rdmsrl_safe(MSR_RAPL_POWER_UNIT, &msr_rapl_power_unit_bits))
return -1;
pmu = kzalloc_node(sizeof(*pmu), GFP_KERNEL, cpu_to_node(cpu));
if (!pmu)
return -1;
@ -555,8 +559,7 @@ static int rapl_cpu_prepare(int cpu)
*
* we cache in local PMU instance
*/
rdmsrl(MSR_RAPL_POWER_UNIT, pmu->hw_unit);
pmu->hw_unit = (pmu->hw_unit >> 8) & 0x1FULL;
pmu->hw_unit = (msr_rapl_power_unit_bits >> 8) & 0x1FULL;
pmu->pmu = &rapl_pmu_class;
/*
@ -677,7 +680,9 @@ static int __init rapl_pmu_init(void)
cpu_notifier_register_begin();
for_each_online_cpu(cpu) {
rapl_cpu_prepare(cpu);
ret = rapl_cpu_prepare(cpu);
if (ret)
goto out;
rapl_cpu_init(cpu);
}
@ -700,6 +705,7 @@ static int __init rapl_pmu_init(void)
hweight32(rapl_cntr_mask),
ktime_to_ms(pmu->timer_interval));
out:
cpu_notifier_register_done();
return 0;

16
arch/x86/kernel/kprobes/core.c
View File

@ -897,9 +897,10 @@ int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
struct kprobe *cur = kprobe_running();
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
switch (kcb->kprobe_status) {
case KPROBE_HIT_SS:
case KPROBE_REENTER:
if (unlikely(regs->ip == (unsigned long)cur->ainsn.insn)) {
/* This must happen on single-stepping */
WARN_ON(kcb->kprobe_status != KPROBE_HIT_SS &&
kcb->kprobe_status != KPROBE_REENTER);
/*
* We are here because the instruction being single
* stepped caused a page fault. We reset the current
@ -914,9 +915,8 @@ int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
else
reset_current_kprobe();
preempt_enable_no_resched();
break;
case KPROBE_HIT_ACTIVE:
case KPROBE_HIT_SSDONE:
} else if (kcb->kprobe_status == KPROBE_HIT_ACTIVE ||
kcb->kprobe_status == KPROBE_HIT_SSDONE) {
/*
* We increment the nmissed count for accounting,
* we can also use npre/npostfault count for accounting
@ -945,10 +945,8 @@ int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
* fixup routine could not handle it,
* Let do_page_fault() fix it.
*/
break;
default:
break;
}
return 0;
}