On 9/10/23 04:29, guo...@kernel.org wrote:
From: Guo Ren <guo...@linux.alibaba.com>
Allow cmdline to force the kernel to use queued_spinlock when
CONFIG_RISCV_COMBO_SPINLOCKS=y.
Signed-off-by: Guo Ren <guo...@linux.alibaba.com>
Signed-off-by: Guo Ren <guo...@kernel.org>
---
Documentation/admin-guide/kernel-parameters.txt | 2 ++
arch/riscv/kernel/setup.c | 16 +++++++++++++++-
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt
b/Documentation/admin-guide/kernel-parameters.txt
index 7dfb540c4f6c..61cacb8dfd0e 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4693,6 +4693,8 @@
[KNL] Number of legacy pty's. Overwrites compiled-in
default number.
+ qspinlock [RISCV] Force to use qspinlock or auto-detect spinlock.
+
qspinlock.numa_spinlock_threshold_ns= [NUMA, PV_OPS]
Set the time threshold in nanoseconds for the
number of intra-node lock hand-offs before the
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index a447cf360a18..0f084f037651 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -270,6 +270,15 @@ static void __init parse_dtb(void)
}
#ifdef CONFIG_RISCV_COMBO_SPINLOCKS
+bool enable_qspinlock_key = false;
You can use __ro_after_init qualifier for enable_qspinlock_key. BTW,
this is not a static key, just a simple flag. So what is the point of
the _key suffix?
Cheers,
Longman
