Ever since 5.19.0-rc1 the serial device has taken almost a second
longer in both suspend and resume. This effect is witnessed in half the
machines in our lab (~10 machines). It occurs on dell, asus, gigabyte
and other machines so it's not hardware specific.
I opened a bugzilla issue which includes the git bisect:
https://bugzilla.kernel.org/show_bug.cgi?id=216216
Bad commit:
commit 3b604ca81202eea2a917eb6491e90f610fba0ec7
Author: John Ogness <[email protected]>
Date: Thu Apr 21 23:28:46 2022 +0206
printk: add pr_flush()
Provide a might-sleep function to allow waiting for console
printers
to catch up to the latest logged message.
Use pr_flush() whenever it is desirable to get buffered messages
printed before continuing: suspend_console(), resume_console(),
console_stop(), console_start(), console_unblank().
Signed-off-by: John Ogness <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link:
https://lore.kernel.org/r/[email protected]
include/linux/printk.h | 7 +++++
kernel/printk/printk.c | 83
++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 90 insertions(+)