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tracepoint: Do not waste memory on mods with no tracepoints 

commit 7dec935a3a upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-02-26 10:54:36 -05:00 committed by Greg Kroah-Hartman
parent 8ed40c1229
commit 7bd3c53d12
1 changed files with 6 additions and 0 deletions
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6
kernel/tracepoint.c
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@ -638,6 +638,9 @@ 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.
@ -681,6 +684,9 @@ 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);