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um: Implement ndelay/udelay in time-travel mode
authorJohannes Berg <johannes.berg@intel.com>
Thu, 13 Feb 2020 13:26:48 +0000 (14:26 +0100)
committerRichard Weinberger <richard@nod.at>
Sun, 29 Mar 2020 21:29:52 +0000 (23:29 +0200)
commit0bc8fb4dda2b461491ec567b2333d13897780d8c
treeced5713f42b176386f212534ecf07822088d3709tree | snapshot
parent88ce642492339f49a0b391af40e5798c08948e49commit | diff
um: Implement ndelay/udelay in time-travel mode

In external or inf-cpu time-travel mode, ndelay/udelay currently
just waste CPU time since the simulation time doesn't advance.
Implement them properly in this case.

Note that the "if (time_travel_mode == ...)" parts compile out
if CONFIG_UML_TIME_TRAVEL_SUPPORT isn't set, time_travel_mode is
defined to TT_MODE_OFF in that case.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
arch/um/include/asm/Kbuild diff | blob | history
arch/um/include/asm/delay.h [new file with mode: 0644] blob
arch/um/include/linux/time-internal.h diff | blob | history
arch/um/kernel/time.c diff | blob | history
Domain: System / Kernel;