linux-kernel - [PATCH 1/3] LoongArch: Reduce min_delta for the arch clockevent device

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

Message-ID: <20241108091545.4182229-2-chenhuacai@loongson.cn>
Date: Fri,  8 Nov 2024 17:15:43 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Xuerui Wang <kernel@...0n.name>,
	loongarch@...ts.linux.dev,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-rt-devel@...ts.linux.dev,
	Guo Ren <guoren@...nel.org>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	linux-kernel@...r.kernel.org,
	Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH 1/3] LoongArch: Reduce min_delta for the arch clockevent device

Now the min_delta is 0x600 (1536) for LoongArch's constant clockevent
device. For a 100MHz hardware timer this means ~15us. This is a little
big, especially for PREEMPT_RT enabled kernels. So reduce it to 1000
(we don't want too small values to affect performance).

Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 arch/loongarch/kernel/time.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/kernel/time.c b/arch/loongarch/kernel/time.c
index 46d7d40c87e3..e914b27a7c89 100644
--- a/arch/loongarch/kernel/time.c
+++ b/arch/loongarch/kernel/time.c
@@ -127,7 +127,7 @@ void sync_counter(void)
 int constant_clockevent_init(void)
 {
 	unsigned int cpu = smp_processor_id();
-	unsigned long min_delta = 0x600;
+	unsigned long min_delta = 1000;
 	unsigned long max_delta = (1UL << 48) - 1;
 	struct clock_event_device *cd;
 	static int irq = 0, timer_irq_installed = 0;
-- 
2.43.5