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authorLinus Torvalds <torvalds@linux-foundation.org>2013-12-02 22:13:09 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2013-12-02 22:13:09 +0400
commite321ae4c207ce4c6c6812fc65e666efc325cc65e (patch)
tree117ded7f1a1bfcdcc6417c6816c02680539d6485 /arch
parentbcc2f9b718d0be9cd77551d37c28daf4ebbc570c (diff)
parente98a6e59dff885eb387163b1a7abe019a44ba90b (diff)
downloadlinux-e321ae4c207ce4c6c6812fc65e666efc325cc65e.tar.xz
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Ingo Molnar: "Misc kernel and tooling fixes" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: tools lib traceevent: Fix conversion of pointer to integer of different size perf/trace: Properly use u64 to hold event_id perf: Remove fragile swevent hlist optimization ftrace, perf: Avoid infinite event generation loop tools lib traceevent: Fix use of multiple options in processing field perf header: Fix possible memory leaks in process_group_desc() perf header: Fix bogus group name perf tools: Tag thread comm as overriden
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/trace/irq_vectors.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/include/asm/trace/irq_vectors.h b/arch/x86/include/asm/trace/irq_vectors.h
index 2874df24e7a4..4cab890007a7 100644
--- a/arch/x86/include/asm/trace/irq_vectors.h
+++ b/arch/x86/include/asm/trace/irq_vectors.h
@@ -72,6 +72,17 @@ DEFINE_IRQ_VECTOR_EVENT(x86_platform_ipi);
DEFINE_IRQ_VECTOR_EVENT(irq_work);
/*
+ * We must dis-allow sampling irq_work_exit() because perf event sampling
+ * itself can cause irq_work, which would lead to an infinite loop;
+ *
+ * 1) irq_work_exit happens
+ * 2) generates perf sample
+ * 3) generates irq_work
+ * 4) goto 1
+ */
+TRACE_EVENT_PERF_PERM(irq_work_exit, is_sampling_event(p_event) ? -EPERM : 0);
+
+/*
* call_function - called when entering/exiting a call function interrupt
* vector handler
*/