Re: [PATCH V11 07/17] riscv: qspinlock: Introduce qspinlock param for command line

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On 9/10/23 04:29, guoren@xxxxxxxxxx wrote:
From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>

Allow cmdline to force the kernel to use queued_spinlock when
CONFIG_RISCV_COMBO_SPINLOCKS=y.

Signed-off-by: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
Signed-off-by: Guo Ren <guoren@xxxxxxxxxx>
---
  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




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