clocksource/drivers/arm_arch_timer: Extract elf_hwcap use to arch-helper

Different mechanisms are used to test and set elf_hwcaps between ARM
and ARM64, this results in the use of ifdeferry in this file when
setting/testing for the EVTSTRM hwcap.

Let's improve readability by extracting this to an arch helper.
Signed-off-by: Andrew Murray <andrew.murray@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

arch/arm/include/asm/arch_timer.h

@@ -4,6 +4,7 @@
 
 #include <asm/barrier.h>
 #include <asm/errno.h>
+#include <asm/hwcap.h>
 #include <linux/clocksource.h>
 #include <linux/init.h>
 #include <linux/types.h>
@@ -124,6 +125,15 @@ static inline void arch_timer_set_cntkctl(u32 cntkctl)
 	isb();
 }
 
+static inline void arch_timer_set_evtstrm_feature(void)
+{
+	elf_hwcap |= HWCAP_EVTSTRM;
+}
+
+static inline bool arch_timer_have_evtstrm_feature(void)
+{
+	return elf_hwcap & HWCAP_EVTSTRM;
+}
 #endif
 
 #endif

arch/arm64/include/asm/arch_timer.h

@@ -20,6 +20,7 @@
 #define __ASM_ARCH_TIMER_H
 
 #include <asm/barrier.h>
+#include <asm/hwcap.h>
 #include <asm/sysreg.h>
 
 #include <linux/bug.h>
@@ -240,4 +241,16 @@ static inline int arch_timer_arch_init(void)
 	return 0;
 }
 
+static inline void arch_timer_set_evtstrm_feature(void)
+{
+	cpu_set_named_feature(EVTSTRM);
+#ifdef CONFIG_COMPAT
+	compat_elf_hwcap |= COMPAT_HWCAP_EVTSTRM;
+#endif
+}
+
+static inline bool arch_timer_have_evtstrm_feature(void)
+{
+	return cpu_have_named_feature(EVTSTRM);
+}
 #endif

drivers/clocksource/arm_arch_timer.c

@@ -804,14 +804,7 @@ static void arch_timer_evtstrm_enable(int divider)
 	cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT)
 			| ARCH_TIMER_VIRT_EVT_EN;
 	arch_timer_set_cntkctl(cntkctl);
-#ifdef CONFIG_ARM64
-	cpu_set_named_feature(EVTSTRM);
-#else
-	elf_hwcap |= HWCAP_EVTSTRM;
-#endif
-#ifdef CONFIG_COMPAT
-	compat_elf_hwcap |= COMPAT_HWCAP_EVTSTRM;
-#endif
+	arch_timer_set_evtstrm_feature();
 	cpumask_set_cpu(smp_processor_id(), &evtstrm_available);
 }
 
@@ -1040,11 +1033,7 @@ static int arch_timer_cpu_pm_notify(struct notifier_block *self,
 	} else if (action == CPU_PM_ENTER_FAILED || action == CPU_PM_EXIT) {
 		arch_timer_set_cntkctl(__this_cpu_read(saved_cntkctl));
 
-#ifdef CONFIG_ARM64
-		if (cpu_have_named_feature(EVTSTRM))
-#else
-		if (elf_hwcap & HWCAP_EVTSTRM)
-#endif
+		if (arch_timer_have_evtstrm_feature())
 			cpumask_set_cpu(smp_processor_id(), &evtstrm_available);
 	}
 	return NOTIFY_OK;