[PATCH] Important per-cpu fix.

Frankly, I'm amazed the kernel worked for long without this.

Every linker script thinks the section is called .data.percpu.
Without this patch, every CPU ends up sharing the same "per-cpu"
variable.

This might explain the wierd per-cpu problem reports from Andrew and
Dave, and also that nagging feeling that I'm an idiot...

include/asm-generic/percpu.h

@@ -10,7 +10,7 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
 /* Separate out the type, so (int[3], foo) works. */
 #ifndef MODULE
 #define DEFINE_PER_CPU(type, name) \
-    __attribute__((__section__(".percpu"))) __typeof__(type) name##__per_cpu
+    __attribute__((__section__(".data.percpu"))) __typeof__(type) name##__per_cpu
 #endif
 
 /* var is in discarded region: offset to particular copy we want */