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Subject[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 <>
--- 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;

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