linux-kernel - [PATCH 11/29] arm64: arch_timer: Make workaround methods optional

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Message-Id: <1492374441-23336-11-git-send-email-daniel.lezcano@linaro.org>
Date:   Sun, 16 Apr 2017 22:27:01 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM ARCHITECTED
        TIMER DRIVER)
Subject: [PATCH 11/29] arm64: arch_timer: Make workaround methods optional

From: Marc Zyngier <marc.zyngier@....com>

Not all errata need to workaround all access types. Allow them to
be optional.

Acked-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
 arch/arm64/include/asm/arch_timer.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/arch_timer.h b/arch/arm64/include/asm/arch_timer.h
index cc1e081..01917b4 100644
--- a/arch/arm64/include/asm/arch_timer.h
+++ b/arch/arm64/include/asm/arch_timer.h
@@ -60,8 +60,9 @@ extern const struct arch_timer_erratum_workaround *timer_unstable_counter_workar
 #define arch_timer_reg_read_stable(reg) 		\
 ({							\
 	u64 _val;					\
-	if (needs_unstable_timer_counter_workaround())		\
-		_val = timer_unstable_counter_workaround->read_##reg();\
+	if (needs_unstable_timer_counter_workaround() &&		\
+	    timer_unstable_counter_workaround->read_##reg)		\
+		_val = timer_unstable_counter_workaround->read_##reg();	\
 	else						\
 		_val = read_sysreg(reg);		\
 	_val;						\
-- 
2.7.4