linux-kernel - [PATCH 3/7] MIPS: csrc-r4k: Select HAVE_UNSTABLE_SCHED

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Message-Id: <20240511-mips-clks-v1-3-ddb4a10ee9f9@flygoat.com>
Date: Sat, 11 May 2024 17:00:10 +0100
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Serge Semin <fancer.lancer@...il.com>, 
 Daniel Lezcano <daniel.lezcano@...aro.org>, 
 Thomas Gleixner <tglx@...utronix.de>
Cc: linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH 3/7] MIPS: csrc-r4k: Select HAVE_UNSTABLE_SCHED_CLOCK if
 64BIT

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@...goat.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