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authorLinus Torvalds <torvalds@linux-foundation.org>2014-01-22 16:35:21 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-22 16:35:21 -0800
commit60eaa0190f6b39dce18eb1975d9773ed8bc9a534 (patch)
treeaef5a45a59af0f493fe44a267fc6333fb245dc2e /kernel/events
parentdf32e43a54d04eda35d2859beaf90e3864d53288 (diff)
parent92fdd98cf8bdec4d6b0c510e2f073ac4fd059be8 (diff)
Merge tag 'trace-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing updates from Steven Rostedt: "This pull request has a new feature to ftrace, namely the trace event triggers by Tom Zanussi. A trigger is a way to enable an action when an event is hit. The actions are: o trace on/off - enable or disable tracing o snapshot - save the current trace buffer in the snapshot o stacktrace - dump the current stack trace to the ringbuffer o enable/disable events - enable or disable another event Namhyung Kim added updates to the tracing uprobes code. Having the uprobes add support for fetch methods. The rest are various bug fixes with the new code, and minor ones for the old code" * tag 'trace-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (38 commits) tracing: Fix buggered tee(2) on tracing_pipe tracing: Have trace buffer point back to trace_array ftrace: Fix synchronization location disabling and freeing ftrace_ops ftrace: Have function graph only trace based on global_ops filters ftrace: Synchronize setting function_trace_op with ftrace_trace_function tracing: Show available event triggers when no trigger is set tracing: Consolidate event trigger code tracing: Fix counter for traceon/off event triggers tracing: Remove double-underscore naming in syscall trigger invocations tracing/kprobes: Add trace event trigger invocations tracing/probes: Fix build break on !CONFIG_KPROBE_EVENT tracing/uprobes: Add @+file_offset fetch method uprobes: Allocate ->utask before handler_chain() for tracing handlers tracing/uprobes: Add support for full argument access methods tracing/uprobes: Fetch args before reserving a ring buffer tracing/uprobes: Pass 'is_return' to traceprobe_parse_probe_arg() tracing/probes: Implement 'memory' fetch method for uprobes tracing/probes: Add fetch{,_size} member into deref fetch method tracing/probes: Move 'symbol' fetch method to kprobes tracing/probes: Implement 'stack' fetch method for uprobes ...
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/uprobes.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index b886a5e7d4ff..307d87c0991a 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1854,6 +1854,10 @@ static void handle_swbp(struct pt_regs *regs)
if (unlikely(!test_bit(UPROBE_COPY_INSN, &uprobe->flags)))
goto out;
+ /* Tracing handlers use ->utask to communicate with fetch methods */
+ if (!get_utask())
+ goto out;
+
handler_chain(uprobe, regs);
if (can_skip_sstep(uprobe, regs))
goto out;