This is another attempt to solve regression caused by the commit
48021f98130880dd74 ("printk: handle blank console arguments passed in.").It prevented a crash caused by empty console= parameter. But it caused performance problems on Chromebooks because they use it to disable all consoles, see see https://lore.kernel.org/r/20201006025935.GA597@jagdpanzerIV.localdomain Solve both problems by using ttynull console driver that was crated exactly for this purpose. The 1st patch should prevent the crash for any invalid console name. The 2nd patch allows to used the ttynull driver also with the widely used console= and console=null parameters. Best Regards, Petr Petr Mladek (2): init/console: Use ttynull as a fallback when there is no console printk/console: Allow to disable console output by using console="" or console=null drivers/tty/Kconfig | 14 -------------- drivers/tty/Makefile | 3 +-- drivers/tty/ttynull.c | 18 ++++++++++++++++++ include/linux/console.h | 3 +++ init/main.c | 10 ++++++++-- kernel/printk/printk.c | 9 ++++++++- 6 files changed, 38 insertions(+), 19 deletions(-) -- 2.26.2
