linux-kernel - [PATCH 5.4 225/453] clocksource/drivers/arm_arch_timer: Use stable count reader in erratum sne

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Date:   Mon, 28 Dec 2020 13:47:41 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Marc Zyngier <maz@...nel.org>,
        Keqian Zhu <zhukeqian1@...wei.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 225/453] clocksource/drivers/arm_arch_timer: Use stable count reader in erratum sne

From: Keqian Zhu <zhukeqian1@...wei.com>

[ Upstream commit d8cc3905b8073c7cfbff94af889fa8dc71f21dd5 ]

In commit 0ea415390cd3 ("clocksource/arm_arch_timer: Use arch_timer_read_counter
to access stable counters"), we separate stable and normal count reader to omit
unnecessary overhead on systems that have no timer erratum.

However, in erratum_set_next_event_tval_generic(), count reader becomes normal
reader. This converts it to stable reader.

Fixes: 0ea415390cd3 ("clocksource/arm_arch_timer: Use arch_timer_read_counter to access stable counters")
Acked-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Keqian Zhu <zhukeqian1@...wei.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Link: https://lore.kernel.org/r/20201204073126.6920-2-zhukeqian1@huawei.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clocksource/arm_arch_timer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 4be83b4de2a0a..d2120fcf1f3f6 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -392,10 +392,10 @@ static void erratum_set_next_event_tval_generic(const int access, unsigned long
 	ctrl &= ~ARCH_TIMER_CTRL_IT_MASK;
 
 	if (access == ARCH_TIMER_PHYS_ACCESS) {
-		cval = evt + arch_counter_get_cntpct();
+		cval = evt + arch_counter_get_cntpct_stable();
 		write_sysreg(cval, cntp_cval_el0);
 	} else {
-		cval = evt + arch_counter_get_cntvct();
+		cval = evt + arch_counter_get_cntvct_stable();
 		write_sysreg(cval, cntv_cval_el0);
 	}
 
-- 
2.27.0