[PATCH] CHECK_IRQ_PER_CPU() to avoid dead code in __do_IRQ()

IRQ_PER_CPU is not used by all architectures.  This patch introduces the
macros ARCH_HAS_IRQ_PER_CPU and CHECK_IRQ_PER_CPU() to avoid the generation
of dead code in __do_IRQ().

ARCH_HAS_IRQ_PER_CPU is defined by architectures using IRQ_PER_CPU in their
include/asm_ARCH/irq.h file.

Through grepping the tree I found the following architectures currently use
IRQ_PER_CPU:

        cris, ia64, ppc, ppc64 and parisc.

Signed-off-by: Karsten Wiese <annabellesgarden@yahoo.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

7 files changed, 32 insertions, 2 deletions

diff --git a/include/asm-cris/irq.h b/include/asm-cris/irq.h
index 8e787fdaedd4..4fab5c3b2e15 100644
--- a/include/asm-cris/irq.h
+++ b/include/asm-cris/irq.h
@@ -1,6 +1,11 @@
 #ifndef _ASM_IRQ_H
 #define _ASM_IRQ_H
 
+/*
+ * IRQ line status macro IRQ_PER_CPU is used
+ */
+#define ARCH_HAS_IRQ_PER_CPU
+
 #include <asm/arch/irq.h>
 
 extern __inline__ int irq_canonicalize(int irq)
diff --git a/include/asm-ia64/irq.h b/include/asm-ia64/irq.h
index 5d930fdc0bea..cd984d08fd15 100644
--- a/include/asm-ia64/irq.h
+++ b/include/asm-ia64/irq.h
@@ -14,6 +14,11 @@
 #define NR_IRQS         256
 #define NR_IRQ_VECTORS  NR_IRQS
 
+/*
+ * IRQ line status macro IRQ_PER_CPU is used
+ */
+#define ARCH_HAS_IRQ_PER_CPU
+
 static __inline__ int
 irq_canonicalize (int irq)
 {
diff --git a/include/asm-parisc/irq.h b/include/asm-parisc/irq.h
index 75654ba93353..f876bdf22056 100644
--- a/include/asm-parisc/irq.h
+++ b/include/asm-parisc/irq.h
@@ -26,6 +26,11 @@
 
 #define NR_IRQS         (CPU_IRQ_MAX + 1)
 
+/*
+ * IRQ line status macro IRQ_PER_CPU is used
+ */
+#define ARCH_HAS_IRQ_PER_CPU
+
 static __inline__ int irq_canonicalize(int irq)
 {
         return (irq == 2) ? 9 : irq;
diff --git a/include/asm-ppc/irq.h b/include/asm-ppc/irq.h
index a244d93ca953..b4b270457edd 100644
--- a/include/asm-ppc/irq.h
+++ b/include/asm-ppc/irq.h
@@ -19,6 +19,11 @@
 #define IRQ_POLARITY_POSITIVE   0x2     /* high level or low->high edge */
 #define IRQ_POLARITY_NEGATIVE   0x0     /* low level or high->low edge */
 
+/*
+ * IRQ line status macro IRQ_PER_CPU is used
+ */
+#define ARCH_HAS_IRQ_PER_CPU
+
 #if defined(CONFIG_40x)
 #include <asm/ibm4xx.h>
 
diff --git a/include/asm-ppc64/irq.h b/include/asm-ppc64/irq.h
index 570678b1da95..99782afb4cde 100644
--- a/include/asm-ppc64/irq.h
+++ b/include/asm-ppc64/irq.h
@@ -33,6 +33,11 @@
 #define IRQ_POLARITY_POSITIVE   0x2     /* high level or low->high edge */
 #define IRQ_POLARITY_NEGATIVE   0x0     /* low level or high->low edge */
 
+/*
+ * IRQ line status macro IRQ_PER_CPU is used
+ */
+#define ARCH_HAS_IRQ_PER_CPU
+
 #define get_irq_desc(irq) (&irq_desc[(irq)])
 
 /* Define a way to iterate across irqs. */
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 4a362b9ec966..69681c3b1f05 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -32,7 +32,12 @@
 #define IRQ_WAITING     32      /* IRQ not yet seen - for autodetection */
 #define IRQ_LEVEL       64      /* IRQ level triggered */
 #define IRQ_MASKED      128     /* IRQ masked - shouldn't be seen again */
-#define IRQ_PER_CPU     256     /* IRQ is per CPU */
+#if defined(ARCH_HAS_IRQ_PER_CPU)
+# define IRQ_PER_CPU    256     /* IRQ is per CPU */
+# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
+#else
+# define CHECK_IRQ_PER_CPU(var) 0
+#endif
 
 /*
  * Interrupt controller descriptor. This is all we need
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index c29f83c16497..3ff7b925c387 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -111,7 +111,7 @@ fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs)
         unsigned int status;
 
         kstat_this_cpu.irqs[irq]++;
-        if (desc->status & IRQ_PER_CPU) {
+        if (CHECK_IRQ_PER_CPU(desc->status)) {
                 irqreturn_t action_ret;
 
                 /*