From: Jiaxun Yang <jiaxun.yang@flygoat.com>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Serge Semin <fancer.lancer@gmail.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
Jiaxun Yang <jiaxun.yang@flygoat.com>
Subject: [PATCH 3/7] MIPS: csrc-r4k: Select HAVE_UNSTABLE_SCHED_CLOCK if 64BIT
Date: Sat, 11 May 2024 17:00:10 +0100 [thread overview]
Message-ID: <20240511-mips-clks-v1-3-ddb4a10ee9f9@flygoat.com> (raw)
In-Reply-To: <20240511-mips-clks-v1-0-ddb4a10ee9f9@flygoat.com>
csrc-r4k suffers from SMP synchronization overhead.
Select HAVE_UNSTABLE_SCHED_CLOCK to workaround drift
between the CPUs on the system. HAVE_UNSTABLE_SCHED_CLOCK
requires cmpxchg64, so enable it for 64 bits only.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
arch/mips/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index f1aa1bf11166..fa8ca0287568 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1083,6 +1083,7 @@ config CSRC_IOASIC
config CSRC_R4K
select CLOCKSOURCE_WATCHDOG if CPU_FREQ
+ select HAVE_UNSTABLE_SCHED_CLOCK if 64BIT
bool
config CSRC_SB1250
--
2.34.1
next prev parent reply other threads:[~2024-05-11 16:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-11 16:00 [PATCH 0/7] MIPS: clocksource cumulative enhancements Jiaxun Yang
2024-05-11 16:00 ` [PATCH 1/7] MIPS: csrc-r4k: Refine rating computation Jiaxun Yang
2024-06-01 22:23 ` Maciej W. Rozycki
2024-05-11 16:00 ` [PATCH 2/7] MIPS: csrc-r4k: Apply verification clocksource flags Jiaxun Yang
2024-05-11 16:00 ` Jiaxun Yang [this message]
2024-06-01 22:30 ` [PATCH 3/7] MIPS: csrc-r4k: Select HAVE_UNSTABLE_SCHED_CLOCK if 64BIT Maciej W. Rozycki
2024-06-04 14:51 ` Jiaxun Yang
2024-05-11 16:00 ` [PATCH 4/7] MIPS: csrc-r4k: Don't register as sched_clock if unfit Jiaxun Yang
2024-05-11 16:00 ` [PATCH 5/7] MIPS: sync-r4k: Rework based on x86 tsc_sync Jiaxun Yang
2024-05-11 16:00 ` [PATCH 6/7] clocksource: mips-gic-timer: Refine rating computation Jiaxun Yang
2024-05-11 16:00 ` [PATCH 7/7] clocksource: mips-gic-timer: Correct sched_clock width Jiaxun Yang
2024-05-27 12:24 ` Philippe Mathieu-Daudé
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