From: Dmitry Osipenko <digetx@gmail.com>
To: "Thierry Reding" <thierry.reding@gmail.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
"Peter De Schrijver" <pdeschrijver@nvidia.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
"Daniel Lezcano" <daniel.lezcano@linaro.org>,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
"Jasper Korten" <jja2000@gmail.com>,
"David Heidelberg" <david@ixit.cz>,
"Peter Geis" <pgwipeout@gmail.com>
Cc: linux-pm@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v9 10/17] arm: tegra20: cpuidle: Make abort_flag atomic
Date: Thu, 13 Feb 2020 02:51:27 +0300 [thread overview]
Message-ID: <20200212235134.12638-11-digetx@gmail.com> (raw)
In-Reply-To: <20200212235134.12638-1-digetx@gmail.com>
Replace memory accessors with atomic API just to make code consistent
with the abort_barrier. The new variant may be even more correct now since
atomic_read() will prevent compiler from generating wrong things like
carrying abort_flag value in a register instead of re-fetching it from
memory.
Acked-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Tested-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Jasper Korten <jja2000@gmail.com>
Tested-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
arch/arm/mach-tegra/cpuidle-tegra20.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-tegra/cpuidle-tegra20.c b/arch/arm/mach-tegra/cpuidle-tegra20.c
index bcc158b72e67..ccb8b0aa6c46 100644
--- a/arch/arm/mach-tegra/cpuidle-tegra20.c
+++ b/arch/arm/mach-tegra/cpuidle-tegra20.c
@@ -32,7 +32,7 @@
#include "sleep.h"
#ifdef CONFIG_PM_SLEEP
-static bool abort_flag;
+static atomic_t abort_flag;
static atomic_t abort_barrier;
static int tegra20_idle_lp2_coupled(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
@@ -168,13 +168,14 @@ static int tegra20_idle_lp2_coupled(struct cpuidle_device *dev,
bool entered_lp2 = false;
if (tegra_pending_sgi())
- WRITE_ONCE(abort_flag, true);
+ atomic_set(&abort_flag, 1);
cpuidle_coupled_parallel_barrier(dev, &abort_barrier);
- if (abort_flag) {
+ if (atomic_read(&abort_flag)) {
cpuidle_coupled_parallel_barrier(dev, &abort_barrier);
- abort_flag = false; /* clean flag for next coming */
+ /* clean flag for next coming */
+ atomic_set(&abort_flag, 0);
return -EINTR;
}
--
2.24.0
next prev parent reply other threads:[~2020-02-12 23:52 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-12 23:51 [PATCH v9 00/17] Consolidate and improve NVIDIA Tegra CPUIDLE driver(s) Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 01/17] ARM: tegra: Compile sleep-tegra20/30.S unconditionally Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 02/17] ARM: tegra: Add tegra_pm_park_secondary_cpu() Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 03/17] ARM: tegra: Remove pen-locking from cpuidle-tegra20 Dmitry Osipenko
2020-02-21 14:58 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 04/17] ARM: tegra: Change tegra_set_cpu_in_lp2() type to void Dmitry Osipenko
2020-02-21 15:04 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 05/17] ARM: tegra: Propagate error from tegra_idle_lp2_last() Dmitry Osipenko
2020-02-21 15:16 ` Daniel Lezcano
2020-02-21 17:21 ` Dmitry Osipenko
2020-02-21 17:40 ` Daniel Lezcano
2020-02-21 18:42 ` Dmitry Osipenko
2020-02-21 19:16 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 06/17] ARM: tegra: Expose PM functions required for new cpuidle driver Dmitry Osipenko
2020-02-21 15:18 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 07/17] ARM: tegra: Rename some of the newly exposed PM functions Dmitry Osipenko
2020-02-21 15:19 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 08/17] ARM: tegra: Make outer_disable() open-coded Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 09/17] arm: tegra20: cpuidle: Handle case where secondary CPU hangs on entering LP2 Dmitry Osipenko
2020-02-21 14:55 ` Daniel Lezcano
2020-02-21 15:43 ` Daniel Lezcano
2020-02-21 16:56 ` Dmitry Osipenko
2020-02-21 17:36 ` Daniel Lezcano
2020-02-21 18:19 ` Dmitry Osipenko
2020-02-21 20:02 ` Daniel Lezcano
2020-02-21 20:21 ` Dmitry Osipenko
2020-02-21 20:42 ` Dmitry Osipenko
2020-02-21 20:48 ` Daniel Lezcano
2020-02-21 20:54 ` Dmitry Osipenko
2020-02-21 21:11 ` Daniel Lezcano
2020-02-24 15:12 ` Dmitry Osipenko
2020-02-12 23:51 ` Dmitry Osipenko [this message]
2020-02-21 15:25 ` [PATCH v9 10/17] arm: tegra20: cpuidle: Make abort_flag atomic Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 11/17] arm: tegra20/30: cpuidle: Remove unnecessary memory barrier Dmitry Osipenko
2020-02-21 15:25 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 12/17] cpuidle: Refactor and move out NVIDIA Tegra20 driver into drivers/cpuidle Dmitry Osipenko
2020-02-21 15:44 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 13/17] cpuidle: tegra: Squash Tegra30 driver into the common driver Dmitry Osipenko
2020-02-21 16:29 ` Daniel Lezcano
2020-02-21 16:59 ` Dmitry Osipenko
2020-02-21 17:41 ` Daniel Lezcano
2020-02-21 18:20 ` Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 14/17] cpuidle: tegra: Squash Tegra114 " Dmitry Osipenko
2020-02-12 23:51 ` [PATCH v9 15/17] cpuidle: tegra: Disable CC6 state if LP2 unavailable Dmitry Osipenko
2020-02-21 16:39 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 16/17] ARM: multi_v7_defconfig: Enable Tegra cpuidle driver Dmitry Osipenko
2020-02-21 16:30 ` Daniel Lezcano
2020-02-12 23:51 ` [PATCH v9 17/17] ARM: tegra: Enable Tegra cpuidle driver in tegra_defconfig Dmitry Osipenko
2020-02-21 16:31 ` Daniel Lezcano
2020-02-13 0:38 ` [PATCH v9 00/17] Consolidate and improve NVIDIA Tegra CPUIDLE driver(s) Dmitry Osipenko
2020-02-18 14:56 ` Dmitry Osipenko
2020-02-24 16:44 ` Dmitry Osipenko
-- strict thread matches above, loose matches on Subject: below --
2019-12-18 21:04 Dmitry Osipenko
2019-12-18 21:04 ` [PATCH v9 10/17] arm: tegra20: cpuidle: Make abort_flag atomic Dmitry Osipenko
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