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

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 
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)
+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?


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