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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-03-22 05:46:04 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-03-31 23:29:08 +0300 |
| commit | 274529ba9bda86c91c2c06da3a641aaf617dd30f (patch) | |
| tree | 3bf398577e821ee17bec1457fc0cd55d7d4d7403 /include/linux/rcupdate.h | |
| parent | f55532a0c0b8bb6148f4e07853b876ef73bc69ca (diff) | |
| download | linux-274529ba9bda86c91c2c06da3a641aaf617dd30f.tar.xz | |
rcu: Consolidate dumping of ftrace buffer
This commit consolidates a couple definitions and several calls for
single-shot ftrace-buffer dumping.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rcupdate.h')
| -rw-r--r-- | include/linux/rcupdate.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 2657aff2725b..45de591657a6 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -1144,4 +1144,17 @@ static inline void rcu_sysidle_force_exit(void) #endif /* #else #ifdef CONFIG_NO_HZ_FULL_SYSIDLE */ +/* + * Dump the ftrace buffer, but only one time per callsite per boot. + */ +#define rcu_ftrace_dump(oops_dump_mode) \ +do { \ + static atomic_t ___rfd_beenhere = ATOMIC_INIT(0); \ + \ + if (!atomic_read(&___rfd_beenhere) && \ + !atomic_xchg(&___rfd_beenhere, 1)) \ + ftrace_dump(oops_dump_mode); \ +} while (0) + + #endif /* __LINUX_RCUPDATE_H */ |