Am 31.08.2018 um 08:20 schrieb Per Jessen:
Andrei Borzenkov wrote:
30.08.2018 14:57, Per Jessen пишет:
32 does seem a pretty odd default.
Ubuntu has
CONFIG_SERIAL_8250_NR_UARTS=48 CONFIG_SERIAL_8250_RUNTIME_UARTS=32
So it is not something entirely specific to openSUSE.
Right - I guess it's a kernel default that was changed at some point. For amusement, going even further back in time - in 2.6.25 :
CONFIG_SERIAL_8250_NR_UARTS=4 CONFIG_SERIAL_8250_RUNTIME_UARTS=4
(All below is for x86_64 only, these defaults are arch specific, which is not a bad idea IMHO)
Upstream default for NR_UARTS was last changed from 4 to 32 during 2.6.27 development cycle with commit
commit 5cb04df8d3f03e37a19f2502591a84156be71772
Author: Ingo Molnar