Merge tag 'trace-v5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt: - Check for NULL in kretprobe_dispatcher() NULL can now be passed in, make sure it can handle it - Clean up unneeded #endif #ifdef of the same preprocessor check in the middle of the block. - Comment clean up - Remove unneeded initialization of the "ret" variable in __trace_uprobe_create() * tag 'trace-v5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing/uprobes: Remove unwanted initialization in __trace_uprobe_create() tracefs: Fix syntax errors in comments tracing: Simplify conditional compilation code in tracing_set_tracer() tracing/kprobes: Check whether get_kretprobe() returns NULL in kretprobe_dispatcher()

Linus Torvalds committed 4 years ago

Commit fa1796a2 parents 16e4bce 12c3e0c4 files · +11 −5Browse files

Showing the changes to kernel (3 of 4 files). Show all

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3 files

kernel/trace/trace.c +0 −2
kernel/trace/trace_kprobe.c +10 −1
kernel/trace/trace_uprobe.c +0 −1

kernel/trace/trace.c+0−2

@@ -6424,9 +6424,7 @@ int tracing_set_tracer(struct trace_array tr, const char buf) · 6423 unmodified lines
6424	6424	synchronize_rcu();
6425	6425	free_snapshot(tr);
6426	6426	}
6427		−#endif
6428	6427
6429		−#ifdef CONFIG_TRACER_MAX_TRACE
6430	6428	if (t->use_max_tr && !had_max_tr) {
6431	6429	ret = tracing_alloc_snapshot_instance(tr);
6432	6430	if (ret < 0)

kernel/trace/trace_kprobe.c+10−1

@@ -1718,8 +1718,17 @@ static int · 1717 unmodified lines
1718	1718	kretprobe_dispatcher(struct kretprobe_instance ri, struct pt_regs regs)
1719	1719	{
1720	1720	struct kretprobe *rp = get_kretprobe(ri);
1721		− struct trace_kprobe *tk = container_of(rp, struct trace_kprobe, rp);
	1721	+ struct trace_kprobe *tk;
	1722	+
	1723	+ /*
	1724	+ * There is a small chance that get_kretprobe(ri) returns NULL when
	1725	+ * the kretprobe is unregister on another CPU between kretprobe's
	1726	+ * trampoline_handler and this function.
	1727	+ */
	1728	+ if (unlikely(!rp))
	1729	+ return 0;
1722	1730
	1731	+ tk = container_of(rp, struct trace_kprobe, rp);
1723	1732	raw_cpu_inc(*tk->nhit);
1724	1733
1725	1734	if (trace_probe_test_flag(&tk->tp, TP_FLAG_TRACE))

kernel/trace/trace_uprobe.c+0−1

@@ -546,7 +546,6 @@ static int __trace_uprobe_create(int argc, const char **argv) · 545 unmodified lines
546	546	bool is_return = false;
547	547	int i, ret;
548	548
549		− ret = 0;
550	549	ref_ctr_offset = 0;
551	550
552	551	switch (argv[0][0]) {