KMEM_CACHE(): simplify slab cache creation

This patch provides a new macro

KMEM_CACHE(<struct>, <flags>)

to simplify slab creation. KMEM_CACHE creates a slab with the name of the
struct, with the size of the struct and with the alignment of the struct.
Additional slab flags may be specified if necessary.

Example

struct test_slab {
	int a,b,c;
	struct list_head;
} __cacheline_aligned_in_smp;

test_slab_cache = KMEM_CACHE(test_slab, SLAB_PANIC)

will create a new slab named "test_slab" of the size sizeof(struct
test_slab) and aligned to the alignment of test slab.  If it fails then we
panic.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 4 insertions, 16 deletions

diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index 766d5912b26a..c0148ae992c4 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -31,11 +31,7 @@ __setup("nodelayacct", delayacct_setup_disable);
 
 void delayacct_init(void)
 {
-        delayacct_cache = kmem_cache_create("delayacct_cache",
-                                        sizeof(struct task_delay_info),
-                                        0,
-                                        SLAB_PANIC,
-                                        NULL, NULL);
+        delayacct_cache = KMEM_CACHE(task_delay_info, SLAB_PANIC);
         delayacct_tsk_init(&init_task);
 }
 
diff --git a/kernel/pid.c b/kernel/pid.c
index 78f2aee90f54..9c80bc23d6b8 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -412,7 +412,5 @@ void __init pidmap_init(void)
         set_bit(0, init_pid_ns.pidmap[0].page);
         atomic_dec(&init_pid_ns.pidmap[0].nr_free);
 
-        pid_cachep = kmem_cache_create("pid", sizeof(struct pid),
-                                        __alignof__(struct pid),
-                                        SLAB_PANIC, NULL, NULL);
+        pid_cachep = KMEM_CACHE(pid, SLAB_PANIC);
 }
diff --git a/kernel/signal.c b/kernel/signal.c
index 3670225ecbc0..2b4087d545a3 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2636,9 +2636,5 @@ __attribute__((weak)) const char *arch_vma_name(struct vm_area_struct *vma)
 
 void __init signals_init(void)
 {
-        sigqueue_cachep =
-                kmem_cache_create("sigqueue",
-                                  sizeof(struct sigqueue),
-                                  __alignof__(struct sigqueue),
-                                  SLAB_PANIC, NULL, NULL);
+        sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC);
 }
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index ad7d2392cb0e..906cae771585 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -524,9 +524,7 @@ void __init taskstats_init_early(void)
 {
         unsigned int i;
 
-        taskstats_cache = kmem_cache_create("taskstats_cache",
-                                                sizeof(struct taskstats),
-                                                0, SLAB_PANIC, NULL, NULL);
+        taskstats_cache = KMEM_CACHE(taskstats, SLAB_PANIC);
         for_each_possible_cpu(i) {
                 INIT_LIST_HEAD(&(per_cpu(listener_array, i).list));
                 init_rwsem(&(per_cpu(listener_array, i).sem));