From: Eric Dumazet <dada1@cosmosbay.com>
Date: Sun, 8 Jan 2006 09:03:40 +0000 (-0800)
Subject: [PATCH] remove unused blkp field in percpu_data
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=f867bac65419a98c9682f4409e087582d29ec5f6;p=deliverable%2Flinux.git

[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 20317d88deba..cb9039a21f2a 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -19,7 +19,6 @@
 
 struct percpu_data {
 	void *ptrs[NR_CPUS];
-	void *blkp;
 };
 
 /*