diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2020-02-13 14:26:48 +0100 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2020-03-29 23:29:52 +0200 |
| commit | 0bc8fb4dda2b461491ec567b2333d13897780d8c (patch) | |
| tree | ced5713f42b176386f212534ecf07822088d3709 /arch/um/kernel | |
| parent | 88ce642492339f49a0b391af40e5798c08948e49 (diff) | |
| download | linux-stable-0bc8fb4dda2b461491ec567b2333d13897780d8c.tar.gz linux-stable-0bc8fb4dda2b461491ec567b2333d13897780d8c.tar.bz2 linux-stable-0bc8fb4dda2b461491ec567b2333d13897780d8c.zip | |
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>
Diffstat (limited to 'arch/um/kernel')
| -rw-r--r-- | arch/um/kernel/time.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c index 15c4825b857e..25eaa6a0c658 100644 --- a/arch/um/kernel/time.c +++ b/arch/um/kernel/time.c @@ -374,6 +374,12 @@ static void time_travel_update_time(unsigned long long next, bool idle) time_travel_del_event(&ne); } +void time_travel_ndelay(unsigned long nsec) +{ + time_travel_update_time(time_travel_time + nsec, false); +} +EXPORT_SYMBOL(time_travel_ndelay); + void time_travel_add_irq_event(struct time_travel_event *e) { BUG_ON(time_travel_mode != TT_MODE_EXTERNAL); |