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authorKarsten Wiese <annabellesgarden@yahoo.de>2005-09-07 00:17:25 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-08 01:57:29 +0200
commitf26fdd59929e1144c6caf72adcaf4561d6e682a4 (patch)
tree85081e47a7c5943ac1d262e806e4138e14360ecc
parent[PATCH] Make the bzImage format self-terminating (diff)
downloadlinux-f26fdd59929e1144c6caf72adcaf4561d6e682a4.tar.xz
linux-f26fdd59929e1144c6caf72adcaf4561d6e682a4.zip
[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>
-rw-r--r--include/asm-cris/irq.h5
-rw-r--r--include/asm-ia64/irq.h5
-rw-r--r--include/asm-parisc/irq.h5
-rw-r--r--include/asm-ppc/irq.h5
-rw-r--r--include/asm-ppc64/irq.h5
-rw-r--r--include/linux/irq.h7
-rw-r--r--kernel/irq/handle.c2
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;
/*