linux-kernel - [PATCH] x86: move interrupts[] to .rodata/.init.data

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Date:	Thu, 13 Dec 2007 09:37:22 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: move interrupts[] to .rodata/.init.data

The array is never written, and on 64-bits it's not even being used
past initial boot.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

 arch/x86/kernel/entry_32.S  |    2 +-
 arch/x86/kernel/i8259_64.c  |    2 +-
 include/asm-x86/hw_irq_32.h |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

--- linux-2.6.24-rc5/arch/x86/kernel/entry_32.S	2007-12-12 11:28:18.000000000 +0100
+++ 2.6.24-rc5-x86-interrupt-section/arch/x86/kernel/entry_32.S	2007-12-04 16:25:04.000000000 +0100
@@ -583,7 +583,7 @@ END(syscall_badsys)
  * Build the entry stubs and pointer table with
  * some assembler magic.
  */
-.data
+.section .rodata,"a"
 ENTRY(interrupt)
 .text
 
--- linux-2.6.24-rc5/arch/x86/kernel/i8259_64.c	2007-12-12 11:28:18.000000000 +0100
+++ 2.6.24-rc5-x86-interrupt-section/arch/x86/kernel/i8259_64.c	2007-12-04 16:25:04.000000000 +0100
@@ -76,7 +76,7 @@ BUILD_16_IRQS(0xc) BUILD_16_IRQS(0xd) BU
 	IRQ(x,c), IRQ(x,d), IRQ(x,e), IRQ(x,f)
 
 /* for the irq vectors */
-static void (*interrupt[NR_VECTORS - FIRST_EXTERNAL_VECTOR])(void) = {
+static void (*__initdata interrupt[NR_VECTORS - FIRST_EXTERNAL_VECTOR])(void) = {
 					  IRQLIST_16(0x2), IRQLIST_16(0x3),
 	IRQLIST_16(0x4), IRQLIST_16(0x5), IRQLIST_16(0x6), IRQLIST_16(0x7),
 	IRQLIST_16(0x8), IRQLIST_16(0x9), IRQLIST_16(0xa), IRQLIST_16(0xb),
--- linux-2.6.24-rc5/include/asm-x86/hw_irq_32.h	2007-12-12 11:29:30.000000000 +0100
+++ 2.6.24-rc5-x86-interrupt-section/include/asm-x86/hw_irq_32.h	2007-12-04 16:25:04.000000000 +0100
@@ -26,7 +26,7 @@
  * Interrupt entry/exit code at both C and assembly level
  */
 
-extern void (*interrupt[NR_IRQS])(void);
+extern void (*const interrupt[NR_IRQS])(void);
 
 #ifdef CONFIG_SMP
 fastcall void reschedule_interrupt(void);



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