Commit f2198ddb authored Jul 06, 2021 by Wei Li Committed by Zheng Zengkai Jul 14, 2021

locking/qspinlock: Disable CNA by default



hulk inclusion
category: feature
bugzilla: 169576
CVE: NA

-------------------------------------------------

Disable CNA by default, this default behavior can be overridden with
the kernel boot command-line option "numa_spinlock=on/off/auto".

Signed-off-by: Wei Li <liwei391@huawei.com>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>

parent 0532ec6d

kernel/locking/qspinlock_cna.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -378,9 +378,9 @@ static inline void cna_lock_handoff(struct mcs_spinlock *node,

		/*
		* Constant (boot-param configurable) flag selecting the NUMA-aware variant
		* of spinlock. Possible values: -1 (off) / 0 (auto, default) / 1 (on).
		* of spinlock. Possible values: -1 (off, default) / 0 (auto) / 1 (on).
		*/
		static int numa_spinlock_flag;
		static int numa_spinlock_flag = -1;

		static int __init numa_spinlock_setup(char *str)
		{