On Mon 2023-01-16 10:23:01, Stephen Rothwell wrote: > Hi all, > > After merging the printk tree, today's linux-next build (x86_64 > allmodconfig) failed like this: > > ERROR: modpost: "console_srcu_read_lock_is_held" [drivers/tty/serial/kgdboc.ko] undefined! > > Caused by commit > > 75ffddf01347 ("tty: serial: kgdboc: fix mutex locking order for configure_kgdboc()") Great catch! Thanks a lot for the report. It gets fixed by: --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -123,6 +123,7 @@ bool console_srcu_read_lock_is_held(void) { return srcu_read_lock_held(&console_srcu); } +EXPORT_SYMBOL(console_srcu_read_lock_is_held); #endif enum devkmsg_log_bits { I have added this fix by ammending the problematic commit so that we do not break bisection, see https://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git/commit/?h=rework/console-list-lock&id=3ef5abd9b5c738bc6fa9a65e40331ef2cb03ad9c Best Regards, Petr