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tracepoint: Do not waste memory on mods with no tracepoints

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

Fixes: b75ef8b44b "Tracepoint: Dissociate from module mutex"
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-02-26 10:54:36 -05:00 • committed by Steven Rostedt
parent 12729f14d8
commit 7dec935a3a
1 changed files with 6 additions and 0 deletions
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6
kernel/tracepoint.c
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@ -636,6 +636,9 @@ static int tracepoint_module_coming(struct module *mod)
struct tp_module *tp_mod, *iter; struct tp_module *tp_mod, *iter;
int ret = 0; int ret = 0;
if (!mod->num_tracepoints)
return 0;
/* /*
* We skip modules that taint the kernel, especially those with different * 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. * 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; struct tp_module *pos;
if (!mod->num_tracepoints)
return 0;
mutex_lock(&tracepoints_mutex); mutex_lock(&tracepoints_mutex);
tracepoint_update_probe_range(mod->tracepoints_ptrs, tracepoint_update_probe_range(mod->tracepoints_ptrs,
mod->tracepoints_ptrs + mod->num_tracepoints); mod->tracepoints_ptrs + mod->num_tracepoints);