[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>
diff --git a/include/asm-cris/irq.h b/include/asm-cris/irq.h
index 8e787fd..4fab5c3 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 5d930fd..cd984d0 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 75654ba..f876bdf 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 a244d93..b4b2704 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 570678b..99782af 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 4a362b9..69681c3 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