diff options
| author | Michal Koutný <mkoutny@suse.com> | 2025-09-24 13:38:09 +0200 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2025-09-30 17:27:58 -0400 |
| commit | 2378a191f440a06e4c60fb8a50f4cb708c10ba40 (patch) | |
| tree | 1cb5c68edb97c6118cee8134b62e5fc5a21d9e32 | |
| parent | 4099b98203d6b33d990586542fa5beee408032a3 (diff) | |
tracing: Ensure optimized hashing works
If ever PID_MAX_DEFAULT changes, it must be compatible with tracing
hashmaps assumptions.
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250924113810.2433478-1-mkoutny@suse.com
Link: https://lore.kernel.org/r/20240409110126.651e94cb@gandalf.local.home/
Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
| -rw-r--r-- | kernel/trace/trace_sched_switch.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c index 518dfc74347a..c46d584ded3b 100644 --- a/kernel/trace/trace_sched_switch.c +++ b/kernel/trace/trace_sched_switch.c @@ -247,6 +247,8 @@ int trace_save_cmdline(struct task_struct *tsk) if (!tsk->pid) return 1; + BUILD_BUG_ON(!is_power_of_2(PID_MAX_DEFAULT)); + tpid = tsk->pid & (PID_MAX_DEFAULT - 1); /* |