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Subject[PATCH] cpumask: fix lg_lock/br_lock.
Date
Use a cpumask_var_t instead of cpumask_t.  We're doing plenty of
allocations here anyway, so it's not really an issue, and it sets a
good example.

(cpumask_t is obsolescent, as are the cpus_* functions).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
fs/file_table.c | 2 +-
fs/namespace.c | 4 +++-
include/linux/lglock.h | 23 +++++++++++++----------
3 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/fs/file_table.c b/fs/file_table.c
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -526,6 +526,6 @@ void __init files_init(unsigned long mem
n = (mempages * (PAGE_SIZE / 1024)) / 10;
files_stat.max_files = max_t(unsigned long, n, NR_FILE);
files_defer_init();
- lg_lock_init(files_lglock);
+ lg_lock_init(files_lglock, GFP_KERNEL);
percpu_counter_init(&nr_files, 0);
}
diff --git a/fs/namespace.c b/fs/namespace.c
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2576,7 +2576,9 @@ void __init mnt_init(void)
for (u = 0; u < HASH_SIZE; u++)
INIT_LIST_HEAD(&mount_hashtable[u]);

- br_lock_init(vfsmount_lock);
+ err = br_lock_init(vfsmount_lock, GFP_KERNEL);
+ if (err)
+ panic("Failed to init vfsmount_lock: %d\n", err);

err = sysfs_init();
if (err)
diff --git a/include/linux/lglock.h b/include/linux/lglock.h
--- a/include/linux/lglock.h
+++ b/include/linux/lglock.h
@@ -25,7 +25,7 @@
#include <linux/cpu.h>

/* can make br locks by using local lock for read side, global lock for write */
-#define br_lock_init(name) name##_lock_init()
+#define br_lock_init(name, gfp) name##_lock_init(gfp)
#define br_read_lock(name) name##_local_lock()
#define br_read_unlock(name) name##_local_unlock()
#define br_write_lock(name) name##_global_lock_online()
@@ -35,7 +35,7 @@
#define DEFINE_BRLOCK(name) DEFINE_LGLOCK(name)


-#define lg_lock_init(name) name##_lock_init()
+#define lg_lock_init(name, gfp) name##_lock_init(gfp)
#define lg_local_lock(name) name##_local_lock()
#define lg_local_unlock(name) name##_local_unlock()
#define lg_local_lock_cpu(name, cpu) name##_local_lock_cpu(cpu)
@@ -61,7 +61,7 @@


#define DECLARE_LGLOCK(name) \
- extern void name##_lock_init(void); \
+ extern int name##_lock_init(gfp_t gfp); \
extern void name##_local_lock(void); \
extern void name##_local_unlock(void); \
extern void name##_local_lock_cpu(int cpu); \
@@ -74,7 +74,7 @@
#define DEFINE_LGLOCK(name) \
\
DEFINE_SPINLOCK(name##_cpu_lock); \
- cpumask_t name##_cpus __read_mostly; \
+ cpumask_var_t name##_cpus __read_mostly; \
DEFINE_PER_CPU(arch_spinlock_t, name##_lock); \
DEFINE_LGLOCK_LOCKDEP(name); \
\
@@ -85,12 +85,12 @@
switch (action & ~CPU_TASKS_FROZEN) { \
case CPU_UP_PREPARE: \
spin_lock(&name##_cpu_lock); \
- cpu_set((unsigned long)hcpu, name##_cpus); \
+ cpumask_set_cpu((unsigned long)hcpu, name##_cpus); \
spin_unlock(&name##_cpu_lock); \
break; \
case CPU_UP_CANCELED: case CPU_DEAD: \
spin_lock(&name##_cpu_lock); \
- cpu_clear((unsigned long)hcpu, name##_cpus); \
+ cpumask_clear_cpu((unsigned long)hcpu, name##_cpus); \
spin_unlock(&name##_cpu_lock); \
} \
return NOTIFY_OK; \
@@ -98,7 +98,7 @@
static struct notifier_block name##_lg_cpu_notifier = { \
.notifier_call = name##_lg_cpu_callback, \
}; \
- void name##_lock_init(void) { \
+ int name##_lock_init(gfp_t gfp) { \
int i; \
LOCKDEP_INIT_MAP(&name##_lock_dep_map, #name, &name##_lock_key, 0); \
for_each_possible_cpu(i) { \
@@ -107,10 +107,13 @@
*lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; \
} \
register_hotcpu_notifier(&name##_lg_cpu_notifier); \
+ if (!alloc_cpumask_var(&name##_cpus, gfp)) \
+ return -ENOMEM; \
get_online_cpus(); \
for_each_online_cpu(i) \
- cpu_set(i, name##_cpus); \
+ cpumask_set_cpu(i, name##_cpus); \
put_online_cpus(); \
+ return 0; \
} \
EXPORT_SYMBOL(name##_lock_init); \
\
@@ -154,7 +157,7 @@
int i; \
spin_lock(&name##_cpu_lock); \
rwlock_acquire(&name##_lock_dep_map, 0, 0, _RET_IP_); \
- for_each_cpu(i, &name##_cpus) { \
+ for_each_cpu(i, name##_cpus) { \
arch_spinlock_t *lock; \
lock = &per_cpu(name##_lock, i); \
arch_spin_lock(lock); \
@@ -165,7 +168,7 @@
void name##_global_unlock_online(void) { \
int i; \
rwlock_release(&name##_lock_dep_map, 1, _RET_IP_); \
- for_each_cpu(i, &name##_cpus) { \
+ for_each_cpu(i, name##_cpus) { \
arch_spinlock_t *lock; \
lock = &per_cpu(name##_lock, i); \
arch_spin_unlock(lock); \

\
 
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