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srcu: Use static init for statically allocated in-module srcu_struct

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Further shrinking the srcu_struct structure is eased by requiring
that in-module srcu_struct structures rely more heavily on static
initialization.  In particular, this preserves the property that
a module-load-time srcu_struct initialization can fail only due
to memory-allocation failure of the per-CPU srcu_data structures.
It might also slightly improve robustness by keeping the number of memory
allocations that must succeed down percpu_alloc() call.

This is in preparation for splitting an srcu_usage structure out
of the srcu_struct structure.

[ paulmck: Fold in qiang1.zhang@intel.com feedback. ]

Cc: Christoph Hellwig <hch@lst.de>
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
Tested-by: "Zhang, Qiang1" <qiang1.zhang@intel.com>
Tested-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney
2023-03-17 13:28:04 -07:00
parent 3e67cb8a3c
commit f4d01a2593
2 changed files with 27 additions and 11 deletions
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19
include/linux/srcutree.h
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@@ -108,15 +108,24 @@ struct srcu_struct {
#define SRCU_STATE_SCAN1 1
#define SRCU_STATE_SCAN2 2
#define __SRCU_STRUCT_INIT(name, pcpu_name) \
{ \
.sda = &pcpu_name, \
#define __SRCU_STRUCT_INIT_COMMON(name) \
.lock = __SPIN_LOCK_UNLOCKED(name.lock), \
.srcu_gp_seq_needed = -1UL, \
.work = __DELAYED_WORK_INITIALIZER(name.work, NULL, 0), \
__SRCU_DEP_MAP_INIT(name) \
__SRCU_DEP_MAP_INIT(name)
#define __SRCU_STRUCT_INIT_MODULE(name) \
{ \
__SRCU_STRUCT_INIT_COMMON(name) \
}
#define __SRCU_STRUCT_INIT(name, pcpu_name) \
{ \
.sda = &pcpu_name, \
__SRCU_STRUCT_INIT_COMMON(name) \
}
/*
* Define and initialize a srcu struct at build time.
* Do -not- call init_srcu_struct() nor cleanup_srcu_struct() on it.
@@ -138,7 +147,7 @@ struct srcu_struct {
*/
#ifdef MODULE
# define __DEFINE_SRCU(name, is_static) \
is_static struct srcu_struct name; \
is_static struct srcu_struct name = __SRCU_STRUCT_INIT_MODULE(name); \
extern struct srcu_struct * const __srcu_struct_##name; \
struct srcu_struct * const __srcu_struct_##name \
__section("___srcu_struct_ptrs") = &name