[PATCH] remove unused blkp field in percpu_data

I found that blkp field was not used in kernel tree.

As most of the times NR_CPUS is a power of two and kmalloc() memory blocks
too, this extra field basically doubles the memory space allocated in
__alloc_percpu() to store the 'struct percpu_data'

(for example, if NR_CPUS=8 on i386, kmalloc(4*8+4) returns a 64 bytes block
instead of a 32 bytes block after this patch)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 20317d8..cb9039a 100644 (file)
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -19,7 +19,6 @@
 
 struct percpu_data {
        void *ptrs[NR_CPUS];
-       void *blkp;
 };
 
 /*