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Subject[for-next][PATCH 03/20] tracepoint: Do not waste memory on mods with no tracepoints
From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>

No reason to allocate tp_module structures for modules that have no
tracepoints. This just wastes memory.

Fixes: b75ef8b44b1c "Tracepoint: Dissociate from module mutex"
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
kernel/tracepoint.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index 29f2654..0d4ef26 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -636,6 +636,9 @@ static int tracepoint_module_coming(struct module *mod)
struct tp_module *tp_mod, *iter;
int ret = 0;

+ if (!mod->num_tracepoints)
+ return 0;
+
/*
* We skip modules that taint the kernel, especially those with different
* module headers (for forced load), to make sure we don't cause a crash.
@@ -679,6 +682,9 @@ static int tracepoint_module_going(struct module *mod)
{
struct tp_module *pos;

+ if (!mod->num_tracepoints)
+ return 0;
+
mutex_lock(&tracepoints_mutex);
tracepoint_update_probe_range(mod->tracepoints_ptrs,
mod->tracepoints_ptrs + mod->num_tracepoints);
--
1.8.5.3



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