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| author | Andreea-Cristina Bernat <bernat.ada@gmail.com> | 2014-08-22 16:28:22 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-09-10 16:48:47 +0200 |
| commit | fb5a613b4f310d6d520daf295547ab35b0ac58a3 (patch) | |
| tree | fa274f95ec5a819bff04aa1e712d4d5aff54d86a | |
| parent | tracing: generate RCU warnings even when tracepoints are disabled (diff) | |
| download | linux-fb5a613b4f310d6d520daf295547ab35b0ac58a3.tar.xz linux-fb5a613b4f310d6d520daf295547ab35b0ac58a3.zip | |
kernel: trace_syscalls: Replace rcu_assign_pointer() with RCU_INIT_POINTER()
The uses of "rcu_assign_pointer()" are NULLing out the pointers.
According to RCU_INIT_POINTER()'s block comment:
"1. This use of RCU_INIT_POINTER() is NULLing out the pointer"
it is better to use it instead of rcu_assign_pointer() because it has a
smaller overhead.
The following Coccinelle semantic patch was used:
@@
@@
- rcu_assign_pointer
+ RCU_INIT_POINTER
(..., NULL)
Link: http://lkml.kernel.org/p/20140822142822.GA32391@ada
Signed-off-by: Andreea-Cristina Bernat <bernat.ada@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| -rw-r--r-- | kernel/trace/trace_syscalls.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index 759d5e004517..4dc8b79c5f75 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -425,7 +425,7 @@ static void unreg_event_syscall_enter(struct ftrace_event_file *file, return; mutex_lock(&syscall_trace_lock); tr->sys_refcount_enter--; - rcu_assign_pointer(tr->enter_syscall_files[num], NULL); + RCU_INIT_POINTER(tr->enter_syscall_files[num], NULL); if (!tr->sys_refcount_enter) unregister_trace_sys_enter(ftrace_syscall_enter, tr); mutex_unlock(&syscall_trace_lock); @@ -463,7 +463,7 @@ static void unreg_event_syscall_exit(struct ftrace_event_file *file, return; mutex_lock(&syscall_trace_lock); tr->sys_refcount_exit--; - rcu_assign_pointer(tr->exit_syscall_files[num], NULL); + RCU_INIT_POINTER(tr->exit_syscall_files[num], NULL); if (!tr->sys_refcount_exit) unregister_trace_sys_exit(ftrace_syscall_exit, tr); mutex_unlock(&syscall_trace_lock); |