[PATCH] headers: linux/irq.h: drop 5 #included header files

[Randy Dunlap]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

<linux/irq.h> does not use nor need several of its #included files,
so drop those header files from irq.h.

<linux/irq.h> is currently #included in around 1135 C source files
(oops, I didn't count other header files that #include it), making it
the 29th most-used header file.

Build tested on i386 and x86_64 * (allnoconfig, tiny.config, defconfig,
allyesconfig, and allmodconfig) and x64_64 allmodconfig + SMP=disabled.

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
---
Ingo/Thomas, please include this in tip.git for more thorough testing.
---
 include/linux/irq.h |    5 -----
 1 file changed, 5 deletions(-)

--- linux.orig/include/linux/irq.h
+++ linux.next/include/linux/irq.h
@@ -10,18 +10,13 @@
  * Thanks. --rmk
  */
 
-#include <linux/smp.h>
-#include <linux/linkage.h>
 #include <linux/cache.h>
 #include <linux/spinlock.h>
 #include <linux/cpumask.h>
-#include <linux/gfp.h>
 #include <linux/irqhandler.h>
 #include <linux/irqreturn.h>
 #include <linux/irqnr.h>
-#include <linux/errno.h>
 #include <linux/topology.h>
-#include <linux/wait.h>
 #include <linux/io.h>
 #include <linux/slab.h>