Revert "printk: Wait for the global console lock when the system is going down"
authorPetr Mladek <pmladek@suse.com>
Thu, 23 Jun 2022 14:51:52 +0000 (16:51 +0200)
committerPetr Mladek <pmladek@suse.com>
Thu, 23 Jun 2022 16:41:40 +0000 (18:41 +0200)
commit20fb0c8272bbb102d15bdd11aa64f828619dd7cc
tree3c805018c62d4e31aa50fbe1dd0572656aec300e
parentb87f02307d3cfbda768520f0687c51ca77e14fc3
Revert "printk: Wait for the global console lock when the system is going down"

This reverts commit b87f02307d3cfbda768520f0687c51ca77e14fc3.

The testing of 5.19 release candidates revealed missing synchronization
between early and regular console functionality.

It would be possible to start the console kthreads later as a workaround.
But it is clear that console lock serialized console drivers between
each other. It opens a big area of possible problems that were not
considered by people involved in the development and review.

printk() is crucial for debugging kernel issues and console output is
very important part of it. The number of consoles is huge and a proper
review would take some time. As a result it need to be reverted for 5.19.

Link: https://lore.kernel.org/r/YrBdjVwBOVgLfHyb@alley
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20220623145157.21938-2-pmladek@suse.com
include/linux/printk.h
kernel/panic.c
kernel/printk/internal.h
kernel/printk/printk.c
kernel/printk/printk_safe.c
kernel/reboot.c