linux-kernel - [tip: timers/core] clocksource/drivers/arm_arch_timer: Fix vDSO clockmode when vDSO disabled

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Date:   Tue, 25 Feb 2020 21:11:25 -0000
From:   "tip-bot2 for Vincenzo Frascino" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Thomas Gleixner <tglx@...utronix.de>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: timers/core] clocksource/drivers/arm_arch_timer: Fix vDSO
 clockmode when vDSO disabled

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     a67de48b3075cbb6ec030205d7b78981def6596d
Gitweb:        https://git.kernel.org/tip/a67de48b3075cbb6ec030205d7b78981def6596d
Author:        Vincenzo Frascino <vincenzo.frascino@....com>
AuthorDate:    Mon, 24 Feb 2020 15:15:52 
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 25 Feb 2020 22:08:39 +01:00

clocksource/drivers/arm_arch_timer: Fix vDSO clockmode when vDSO disabled

The arm_arch_timer requires 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:
‘VDSO_CLOCKMODE_ARCHTIMER’ undeclared here (not in a function)
  static enum vdso_clock_mode vdso_default = VDSO_CLOCKMODE_ARCHTIMER;

Make the usage of VDSO_CLOCKMODE_ARCHTIMER depend on the VDSO enablement
and initialize the vdso clockmode variable with VDSO_CLOCKMODE_NONE
otherwise.

[ tglx: Match changelog and patch content. ]

Fixes: 5e3c6a312a09 ("ARM/arm64: vdso: Use common vdso clock mode storage")
Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lkml.kernel.org/r/20200224151552.57274-1-vincenzo.frascino@arm.com

---
 drivers/clocksource/arm_arch_timer.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index ee2420d..d53f4c7 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);