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Two fixes for timers: 

- Use the ALARM feature check in the alarmtimer core code insted of
     the old method of checking for the set_alarm() callback. Drivers
     can have that callback set but the feature bit cleared. If such
     a RTC device is selected then alarms wont work.
 
   - Use a proper define to let the preprocessor check whether Hyper-V VDSO
     clocksource should be active. The code used a constant in an enum with
     #ifdef, which evaluates to always false and disabled the clocksource
     for VDSO.
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Merge tag 'timers-urgent-2021-05-16' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer fixes from Thomas Gleixner:
 "Two fixes for timers:

   - Use the ALARM feature check in the alarmtimer core code insted of
     the old method of checking for the set_alarm() callback.

     Drivers can have that callback set but the feature bit cleared. If
     such a RTC device is selected then alarms wont work.

   - Use a proper define to let the preprocessor check whether Hyper-V
     VDSO clocksource should be active.

     The code used a constant in an enum with #ifdef, which evaluates to
     always false and disabled the clocksource for VDSO"

* tag 'timers-urgent-2021-05-16' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  clocksource/drivers/hyper-v: Re-enable VDSO_CLOCKMODE_HVCLOCK on X86
  alarmtimer: Check RTC features instead of ops
This commit is contained in:
Linus Torvalds 2021-05-16 09:42:13 -07:00
parent f44e58bb19 3486d2c9be
commit 8ce3648158
3 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/vdso/clocksource.h
View File

@ -7,4 +7,6 @@
VDSO_CLOCKMODE_PVCLOCK, \
VDSO_CLOCKMODE_HVCLOCK
#define HAVE_VDSO_CLOCKMODE_HVCLOCK
#endif /* __ASM_VDSO_CLOCKSOURCE_H */

4
drivers/clocksource/hyperv_timer.c
View File

@ -419,7 +419,7 @@ static void resume_hv_clock_tsc(struct clocksource *arg)
hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr);
}
#ifdef VDSO_CLOCKMODE_HVCLOCK
#ifdef HAVE_VDSO_CLOCKMODE_HVCLOCK
static int hv_cs_enable(struct clocksource *cs)
{
vclocks_set_used(VDSO_CLOCKMODE_HVCLOCK);
@ -435,7 +435,7 @@ static struct clocksource hyperv_cs_tsc = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
.suspend= suspend_hv_clock_tsc,
.resume = resume_hv_clock_tsc,
#ifdef VDSO_CLOCKMODE_HVCLOCK
#ifdef HAVE_VDSO_CLOCKMODE_HVCLOCK
.enable = hv_cs_enable,
.vdso_clock_mode = VDSO_CLOCKMODE_HVCLOCK,
#else

2
kernel/time/alarmtimer.c
View File

@ -92,7 +92,7 @@ static int alarmtimer_rtc_add_device(struct device *dev,
if (rtcdev)
return -EBUSY;
if (!rtc->ops->set_alarm)
if (!test_bit(RTC_FEATURE_ALARM, rtc->features))
return -1;
if (!device_may_wakeup(rtc->dev.parent))
return -1;