diff options
| -rw-r--r-- | include/linux/srcutree.h | 19 | ||||
| -rw-r--r-- | kernel/rcu/srcutree.c | 19 |
2 files changed, 27 insertions, 11 deletions
diff --git a/include/linux/srcutree.h b/include/linux/srcutree.h index 488d0e5d1ba3..3ce6deee1dbe 100644 --- a/include/linux/srcutree.h +++ b/include/linux/srcutree.h @@ -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 diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c index ab4ee58af84b..7e6e7dfb1a87 100644 --- a/kernel/rcu/srcutree.c +++ b/kernel/rcu/srcutree.c @@ -1873,13 +1873,14 @@ void __init srcu_init(void) static int srcu_module_coming(struct module *mod) { int i; + struct srcu_struct *ssp; struct srcu_struct **sspp = mod->srcu_struct_ptrs; - int ret; for (i = 0; i < mod->num_srcu_structs; i++) { - ret = init_srcu_struct(*(sspp++)); - if (WARN_ON_ONCE(ret)) - return ret; + ssp = *(sspp++); + ssp->sda = alloc_percpu(struct srcu_data); + if (WARN_ON_ONCE(!ssp->sda)) + return -ENOMEM; } return 0; } @@ -1888,10 +1889,16 @@ static int srcu_module_coming(struct module *mod) static void srcu_module_going(struct module *mod) { int i; + struct srcu_struct *ssp; struct srcu_struct **sspp = mod->srcu_struct_ptrs; - for (i = 0; i < mod->num_srcu_structs; i++) - cleanup_srcu_struct(*(sspp++)); + for (i = 0; i < mod->num_srcu_structs; i++) { + ssp = *(sspp++); + if (!rcu_seq_state(smp_load_acquire(&ssp->srcu_gp_seq_needed)) && + !WARN_ON_ONCE(!ssp->sda_is_static)) + cleanup_srcu_struct(ssp); + free_percpu(ssp->sda); + } } /* Handle one module, either coming or going. */ |