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| author | Oleg Nesterov <oleg@redhat.com> | 2013-01-31 19:15:30 +0100 |
|---|---|---|
| committer | Oleg Nesterov <oleg@redhat.com> | 2013-02-08 18:24:30 +0100 |
| commit | b64b007797c1e6d6b745c93c296ba1d5f4d72d86 (patch) | |
| tree | b2cfd860f68b421484d7992f354d62b8e6b7f1ce | |
| parent | 7e4e28c53963e6cfa94d8109bb8f5233c5659048 (diff) | |
| download | op-kernel-dev-b64b007797c1e6d6b745c93c296ba1d5f4d72d86.zip op-kernel-dev-b64b007797c1e6d6b745c93c296ba1d5f4d72d86.tar.gz | |
uprobes/tracing: Introduce is_trace_uprobe_enabled()
probe_event_enable/disable() check tu->consumer != NULL to avoid the
wrong uprobe_register/unregister().
We are going to kill this pointer and "struct uprobe_trace_consumer",
so we add the new helper, is_trace_uprobe_enabled(), which can rely
on TP_FLAG_TRACE/TP_FLAG_PROFILE instead.
Note: the current logic doesn't look optimal, it is not clear why
TP_FLAG_TRACE/TP_FLAG_PROFILE are mutually exclusive, we will probably
change this later.
Also kill the unused TP_FLAG_UPROBE.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
| -rw-r--r-- | kernel/trace/trace_probe.h | 1 | ||||
| -rw-r--r-- | kernel/trace/trace_uprobe.c | 9 |
2 files changed, 7 insertions, 3 deletions
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h index 9337086..5c7e09d 100644 --- a/kernel/trace/trace_probe.h +++ b/kernel/trace/trace_probe.h @@ -66,7 +66,6 @@ #define TP_FLAG_TRACE 1 #define TP_FLAG_PROFILE 2 #define TP_FLAG_REGISTERED 4 -#define TP_FLAG_UPROBE 8 /* data_rloc: data relative location, compatible with u32 */ diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index f7838cf..d6c6e2a 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -539,12 +539,17 @@ partial: return TRACE_TYPE_PARTIAL_LINE; } +static inline bool is_trace_uprobe_enabled(struct trace_uprobe *tu) +{ + return tu->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE); +} + static int probe_event_enable(struct trace_uprobe *tu, int flag) { struct uprobe_trace_consumer *utc; int ret = 0; - if (tu->consumer) + if (is_trace_uprobe_enabled(tu)) return -EINTR; utc = kzalloc(sizeof(struct uprobe_trace_consumer), GFP_KERNEL); @@ -568,7 +573,7 @@ static int probe_event_enable(struct trace_uprobe *tu, int flag) static void probe_event_disable(struct trace_uprobe *tu, int flag) { - if (!tu->consumer) + if (!is_trace_uprobe_enabled(tu)) return; uprobe_unregister(tu->inode, tu->offset, &tu->consumer->cons); |
