From 2ec303113d978931ef368886c4c6bc854493e8bf Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 21 Jan 2022 16:13:52 -0800 Subject: srcu: Dynamically allocate srcu_node array This commit shrinks the srcu_struct structure by converting its ->node field from a fixed-size compile-time array to a pointer to a dynamically allocated array. In kernels built with large values of NR_CPUS that boot on systems with smaller numbers of CPUs, this can save significant memory. [ paulmck: Apply kernel test robot feedback. ] Reported-by: A cast of thousands Co-developed-by: Neeraj Upadhyay Signed-off-by: Neeraj Upadhyay Signed-off-by: Paul E. McKenney --- include/linux/srcutree.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/srcutree.h b/include/linux/srcutree.h index 8d1da136a93a..8501b6b45941 100644 --- a/include/linux/srcutree.h +++ b/include/linux/srcutree.h @@ -60,7 +60,7 @@ struct srcu_node { * Per-SRCU-domain structure, similar in function to rcu_state. */ struct srcu_struct { - struct srcu_node node[NUM_RCU_NODES]; /* Combining tree. */ + struct srcu_node *node; /* Combining tree. */ struct srcu_node *level[RCU_NUM_LVLS + 1]; /* First node at each level. */ int srcu_size_state; /* Small-to-big transition state. */ -- cgit v1.2.3