[PATCH] remove unused blkp field in percpu_data

[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 <[email protected]>

--- linux-2.6/include/linux/percpu.h	2005-11-29 04:51:27.000000000 +0100
+++ linux-2.6-ed/linux/percpu.h	2005-12-03 01:57:23.000000000 +0100
@@ -19,7 +19,6 @@
 
 struct percpu_data {
 	void *ptrs[NR_CPUS];
-	void *blkp;
 };
 
 /* 

---

• References:
  • [PATCH] race condition in procfs
    • From: Grzegorz Nosek <[email protected]>
  • Re: [PATCH] race condition in procfs
    • From: Andrew Morton <[email protected]>
  • [PATCH] shrinks dentry struct
    • From: Eric Dumazet <[email protected]>

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