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[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>
This commit is contained in:
Karsten Wiese 2005-09-06 15:17:25 -07:00 committed by Linus Torvalds
parent f8eeaaf418
commit f26fdd5992
7 changed files with 32 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/asm-cris/irq.h
View File

@ -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)

5
include/asm-ia64/irq.h
View File

@ -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)
{

5
include/asm-parisc/irq.h
View File

@ -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;

5
include/asm-ppc/irq.h
View File

@ -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>

5
include/asm-ppc64/irq.h
View File

@ -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. */

5
include/linux/irq.h
View File

@ -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 */
#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

2
kernel/irq/handle.c
View File

@ -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;
/*