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>

1 files changed, 1 insertions, 3 deletions

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);
 }