[PATCH v3] clocksource: Fix arm_arch_timer clockmode when vDSO disabled

[Vincenzo Frascino]

The arm_arch_timer requires that VDSO_CLOCKMODE_ARCHTIMER to be
defined to compile correctly. On arm the vDSO can be disabled and when
this is the case the compilation ends prematurely with an error:

 $ make ARCH=arm multi_v7_defconfig
 $ ./scripts/config -d VDSO
 $ make

drivers/clocksource/arm_arch_timer.c:73:44: error:
âVDSO_CLOCKMODE_ARCHTIMERâ undeclared here (not in a function)
  static enum vdso_clock_mode vdso_default = VDSO_CLOCKMODE_ARCHTIMER;
                                             ^
scripts/Makefile.build:267: recipe for target
'drivers/clocksource/arm_arch_timer.o' failed
make[2]: *** [drivers/clocksource/arm_arch_timer.o] Error 1
make[2]: *** Waiting for unfinished jobs....
scripts/Makefile.build:505: recipe for target 'drivers/clocksource' failed
make[1]: *** [drivers/clocksource] Error 2
make[1]: *** Waiting for unfinished jobs....
Makefile:1683: recipe for target 'drivers' failed
make: *** [drivers] Error 2

Define VDSO_CLOCKMODE_ARCHTIMER as VDSO_CLOCKMODE_NONE when the vDSOs are
not enabled to address the issue.

Fixes: 5e3c6a312a09 ("ARM/arm64: vdso: Use common vdso clock mode storage")
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Mark Rutland <Mark.Rutland@xxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reported-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
---
 drivers/clocksource/arm_arch_timer.c | 4 ++++
 1 file changed, 4 insertions(+)

This patch has been rebased and tested on tip/timers/core.

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index ee2420d56f67..d53f4c7ccaae 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -69,7 +69,11 @@ static enum arch_timer_ppi_nr arch_timer_uses_ppi = ARCH_TIMER_VIRT_PPI;
 static bool arch_timer_c3stop;
 static bool arch_timer_mem_use_virtual;
 static bool arch_counter_suspend_stop;
+#ifdef CONFIG_GENERIC_GETTIMEOFDAY
 static enum vdso_clock_mode vdso_default = VDSO_CLOCKMODE_ARCHTIMER;
+#else
+static enum vdso_clock_mode vdso_default = VDSO_CLOCKMODE_NONE;
+#endif /* CONFIG_GENERIC_GETTIMEOFDAY */
 
 static cpumask_t evtstrm_available = CPU_MASK_NONE;
 static bool evtstrm_enable = IS_ENABLED(CONFIG_ARM_ARCH_TIMER_EVTSTREAM);
-- 
2.25.0