linux-kernel - [tip: timers/core] clocksource/drivers/imx-tpm: Exclude sched clock for ARM64

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <164725011047.16921.16930641794301120667.tip-bot2@tip-bot2>
Date:   Mon, 14 Mar 2022 09:28:30 -0000
From:   "tip-bot2 for Peng Fan" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Peng Fan <peng.fan@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: timers/core] clocksource/drivers/imx-tpm: Exclude sched clock for ARM64

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

Commit-ID:     10720e120e2b1d66172dccb06eb4f346a665cca6
Gitweb:        https://git.kernel.org/tip/10720e120e2b1d66172dccb06eb4f346a665cca6
Author:        Peng Fan <peng.fan@....com>
AuthorDate:    Wed, 05 Jan 2022 20:43:04 +08:00
Committer:     Daniel Lezcano <daniel.lezcano@...aro.org>
CommitterDate: Wed, 16 Feb 2022 14:43:30 +01:00

clocksource/drivers/imx-tpm: Exclude sched clock for ARM64

For ARM64 platform such as i.MX8ULP which has ARMv8 generic timer as sched
clock, which is much faster compared with tpm sched clock. Reading the
tpm count register in i.MX8ULP requires about 290ns, this is slow and
introduce scheduler latency. So exclude tpm sched clock for ARM64
platform.

Signed-off-by: Peng Fan <peng.fan@....com>
Link: https://lore.kernel.org/r/20220105124304.3567629-1-peng.fan@oss.nxp.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/timer-imx-tpm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/timer-imx-tpm.c b/drivers/clocksource/timer-imx-tpm.c
index df80641..60cefc2 100644
--- a/drivers/clocksource/timer-imx-tpm.c
+++ b/drivers/clocksource/timer-imx-tpm.c
@@ -150,10 +150,10 @@ static int __init tpm_clocksource_init(void)
 	tpm_delay_timer.read_current_timer = &tpm_read_current_timer;
 	tpm_delay_timer.freq = timer_of_rate(&to_tpm) >> 3;
 	register_current_timer_delay(&tpm_delay_timer);
-#endif
 
 	sched_clock_register(tpm_read_sched_clock, counter_width,
 			     timer_of_rate(&to_tpm) >> 3);
+#endif
 
 	return clocksource_mmio_init(timer_base + TPM_CNT,
 				     "imx-tpm",