If ever PID_MAX_DEFAULT changes, it must be compatible with tracing
hashmaps assumptions.

Link: https://lore.kernel.org/r/[email protected]/
Signed-off-by: Michal Koutný <[email protected]>
---
 kernel/trace/trace_sched_switch.c | 2 ++
 1 file changed, 2 insertions(+)

Drive-by flushing an old idea. Take it or leave it.

diff --git a/kernel/trace/trace_sched_switch.c 
b/kernel/trace/trace_sched_switch.c
index cb49f7279dc80..aabae7daaac91 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -243,6 +243,8 @@ int trace_create_savedcmd(void)
 int trace_save_cmdline(struct task_struct *tsk)
 {
        unsigned tpid, idx;
+       /* so that map_pid_to_cmdline indexing is efficient */
+       BUILD_BUG_ON(!is_power_of_2(PID_MAX_DEFAULT));
 
        /* treat recording of idle task as a success */
        if (!tsk->pid)
-- 
2.51.0


Reply via email to