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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2018-08-15 00:41:49 +0300
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2018-08-31 02:10:49 +0300
commit4e6ea4ef56f9425cd239ffdb6be45b3aeeb347fd (patch)
tree81702573011d79ef39d2934e020372976256b9de /include/linux/srcutree.h
parent55cda2290bf9d8510fbe7c1939a36680476c69c4 (diff)
downloadlinux-4e6ea4ef56f9425cd239ffdb6be45b3aeeb347fd.tar.xz
srcu: Make early-boot call_srcu() reuse workqueue lists
Allocating a list_head structure that is almost never used, and, when used, is used only during early boot (rcu_init() and earlier), is a bit wasteful. This commit therefore eliminates that list_head in favor of the one in the work_struct structure. This is safe because the work_struct structure cannot be used until after rcu_init() returns. Reported-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Tejun Heo <tj@kernel.org> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Tested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/srcutree.h')
-rw-r--r--include/linux/srcutree.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/include/linux/srcutree.h b/include/linux/srcutree.h
index 9cfa4610113a..0ae91b3a7406 100644
--- a/include/linux/srcutree.h
+++ b/include/linux/srcutree.h
@@ -94,7 +94,6 @@ struct srcu_struct {
/* callback for the barrier */
/* operation. */
struct delayed_work work;
- struct list_head srcu_boot_entry; /* Early-boot callbacks. */
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map;
#endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
@@ -110,7 +109,7 @@ struct srcu_struct {
.sda = &pcpu_name, \
.lock = __SPIN_LOCK_UNLOCKED(name.lock), \
.srcu_gp_seq_needed = -1UL, \
- .srcu_boot_entry = LIST_HEAD_INIT(name.srcu_boot_entry), \
+ .work = __DELAYED_WORK_INITIALIZER(name.work, NULL, 0), \
__SRCU_DEP_MAP_INIT(name) \
}