kernel/kprobes.c: don't pad kretprobe_table_locks[] on uniprocessor builds
Andrew Morton [Wed, 12 Nov 2008 21:26:57 +0000 (13:26 -0800)]
We only need the cacheline padding on SMP kernels.  Saves 6k:

   text    data     bss     dec     hex filename
   5713     388    8840   14941    3a5d kernel/kprobes.o
   5713     388    2632    8733    221d kernel/kprobes.o

Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/kprobes.c

index f83c5e4..9f8a3f2 100644 (file)
@@ -72,7 +72,7 @@ static bool kprobe_enabled;
 DEFINE_MUTEX(kprobe_mutex);            /* Protects kprobe_table */
 static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
 static struct {
-       spinlock_t lock ____cacheline_aligned;
+       spinlock_t lock ____cacheline_aligned_in_smp;
 } kretprobe_table_locks[KPROBE_TABLE_SIZE];
 
 static spinlock_t *kretprobe_table_lock_ptr(unsigned long hash)