Commit 5524ea32 authored by Andi Kleen's avatar Andi Kleen Committed by Ingo Molnar
Browse files

x86: don't set up early exception handlers for external interrupts 



All of early setup runs with interrupts disabled, so there is no
need to set up early exception handlers for vectors >= 32

This saves some minor text size.

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Cc: mingo@elte.hu
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 366932de

arch/x86/kernel/head64.c

+1 −1
Original line number Diff line number Diff line
@@ -127,7 +127,7 @@ void __init x86_64_start_kernel(char * real_mode_data) 
	/* Cleanup the over mapped high alias */

	cleanup_highmap();



	for (i = 0; i < IDT_ENTRIES; i++) {

	for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) {

#ifdef CONFIG_EARLY_PRINTK

		set_intr_gate(i, &early_idt_handlers[i]);

#else

arch/x86/kernel/head_64.S

+2 −4
Original line number Diff line number Diff line
@@ -278,10 +278,8 @@ bad_address: 


	.globl early_idt_handlers

early_idt_handlers:

	early_idt_tramp 0, 63

	early_idt_tramp 64, 127

	early_idt_tramp 128, 191

	early_idt_tramp 192, 255

	.set maxe, NUM_EXCEPTION_VECTORS-1

	early_idt_tramp 0, maxe

#endif



ENTRY(early_idt_handler)

include/asm-x86/segment.h

+2 −1
Original line number Diff line number Diff line
@@ -191,13 +191,14 @@ 
#define SEGMENT_TI_MASK		0x4



#define IDT_ENTRIES 256

#define NUM_EXCEPTION_VECTORS 32

#define GDT_SIZE (GDT_ENTRIES * 8)

#define GDT_ENTRY_TLS_ENTRIES 3

#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)



#ifdef __KERNEL__

#ifndef __ASSEMBLY__

extern const char early_idt_handlers[IDT_ENTRIES][10];

extern const char early_idt_handlers[NUM_EXCEPTION_VECTORS][10];

#endif

#endif