linux-kernel - [PATCH] Revert "MIPS: csrc-r4k: Select HAVE_UNSTABLE_SCHED

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Message-ID: <20241223092041.257941-1-xry111@xry111.site>
Date: Mon, 23 Dec 2024 17:20:41 +0800
From: Xi Ruoyao <xry111@...111.site>
To: Jiaxun Yang <jiaxun.yang@...goat.com>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Xi Ruoyao <xry111@...111.site>,
	stable@...r.kernel.org,
	Icenowy Zheng <icenowy@...c.io>
Subject: [PATCH] Revert "MIPS: csrc-r4k: Select HAVE_UNSTABLE_SCHED_CLOCK if SMP && 64BIT"

This reverts commit 426fa8e4fe7bb914b5977cbce453a9926bf5b2e6.

The commit has caused two issues on Loongson 3A4000:

1. The timestamp in dmesg become erratic, like:

    [3.736957] amdgpu 0000:04:00.0: ... ...
    [3.748895] [drm] Initialized amdgpu ... ...
    [18446744073.381141] amdgpu 0000:04:00:0: ... ...
    [1.613326] igb 0000:03:00.0 enp3s0: ... ...

2. More seriously, some workloads (for example, the test
   stdlib/test-cxa_atexit2 in the Glibc test suite) triggers an RCU
   stall and hang the system with a high probably (4 hangs out of 5
   tests).

Revert this commit to use jiffie on Loongson MIPS systems and fix these
issues for now.  The root cause may need more investigation.

Cc: stable@...r.kernel.org # 6.11+
Cc: Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: Icenowy Zheng <icenowy@...c.io>
Signed-off-by: Xi Ruoyao <xry111@...111.site>
---
 arch/mips/Kconfig | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 467b10f4361a..5078ebf071ec 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1084,7 +1084,6 @@ config CSRC_IOASIC
 
 config CSRC_R4K
 	select CLOCKSOURCE_WATCHDOG if CPU_FREQ
-	select HAVE_UNSTABLE_SCHED_CLOCK if SMP && 64BIT
 	bool
 
 config CSRC_SB1250
-- 
2.47.1