This function is called by init/main.c and earlier used to allocate
space to pidmap. Now idr struct for init_pid_ns is initialised and ID 0
alocated using idr_alloc_cyclic. Also deleted NULL allocation for
pidmap.
Signed-off-by: Gargi Sharma <gs051095@xxxxxxxxx>
---
include/linux/pid_namespace.h | 2 +-
init/main.c | 2 +-
kernel/pid.c | 12 ++++--------
3 files changed, 6 insertions(+), 10 deletions(-)
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index c2a989d..b089791 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -105,6 +105,6 @@ static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
void pidhash_init(void);
-void pidmap_init(void);
+void pid_idr_init(void);
#endif /* _LINUX_PID_NS_H */
diff --git a/init/main.c b/init/main.c
index f866510..a14f01e 100644
--- a/init/main.c
+++ b/init/main.c
@@ -636,7 +636,7 @@ asmlinkage __visible void __init start_kernel(void)
if (late_time_init)
late_time_init();
calibrate_delay();
- pidmap_init();
+ pid_idr_init();
anon_vma_init();
acpi_early_init();
#ifdef CONFIG_X86
diff --git a/kernel/pid.c b/kernel/pid.c
index 3c74ca8..bd8024b 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -64,9 +64,6 @@ int pid_max_max = PID_MAX_LIMIT;
*/
struct pid_namespace init_pid_ns = {
.kref = KREF_INIT(2),
- .pidmap = {
- [ 0 ... PIDMAP_ENTRIES-1] = { ATOMIC_INIT(BITS_PER_PAGE), NULL }
- },
.last_pid = 0,
.nr_hashed = PIDNS_HASH_ADDING,
.level = 0,
@@ -459,7 +456,7 @@ void __init pidhash_init(void)
INIT_HLIST_HEAD(&pid_hash[i]);
}
-void __init pidmap_init(void)
+void __init pid_idr_init(void)
{
/* Verify no one has done anything silly: */
BUILD_BUG_ON(PID_MAX_LIMIT >= PIDNS_HASH_ADDING);
@@ -471,10 +468,9 @@ void __init pidmap_init(void)
PIDS_PER_CPU_MIN * num_possible_cpus());
pr_info("pid_max: default: %u minimum: %u\n", pid_max, pid_max_min);
- init_pid_ns.pidmap[0].page = kzalloc(PAGE_SIZE, GFP_KERNEL);
- /* Reserve PID 0. We never call free_pidmap(0) */
- set_bit(0, init_pid_ns.pidmap[0].page);
- atomic_dec(&init_pid_ns.pidmap[0].nr_free);
+ idr_init(init_pid_ns.idr);
+ /* Reserve PID 0. */
+ idr_alloc_cyclic(init_pid_ns.idr, &init_pid_ns, 0, 0, GFP_KERNEL);
init_pid_ns.pid_cachep = KMEM_CACHE(pid,
SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_ACCOUNT);
--
2.7.4
--
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