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x86: 32 bit: interrupt stub consistency with 64 bit

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Don't generate interrupt stubs for interrupt vectors below
FIRST_EXTERNAL_VECTOR, and make the table of interrupt vectors
(interrupt[]) __initconst.  Both of these changes both conserve memory
and improve consistency with 64 bits.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2008-11-11 13:03:07 -08:00
parent f21f237cf5
commit 4687518c4c
4 changed files with 7 additions and 6 deletions
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2
arch/x86/include/asm/hw_irq.h
View file

@ -110,7 +110,7 @@ extern asmlinkage void smp_invalidate_interrupt(struct pt_regs *);
#endif
#ifdef CONFIG_X86_32
extern void (*const interrupt[NR_VECTORS])(void);
extern void (*__initconst interrupt[NR_VECTORS-FIRST_EXTERNAL_VECTOR])(void);
#endif
typedef int vector_irq_t[NR_VECTORS];

6
arch/x86/kernel/entry_32.S
View file

@ -622,16 +622,16 @@ END(syscall_badsys)
* Build the entry stubs and pointer table with
* some assembler magic.
*/
.section .rodata,"a"
.section .init.rodata,"a"
ENTRY(interrupt)
.text
ENTRY(irq_entries_start)
RING0_INT_FRAME
vector=0
vector=FIRST_EXTERNAL_VECTOR
.rept NR_VECTORS
ALIGN
.if vector
.if vector != FIRST_EXTERNAL_VECTOR
CFI_ADJUST_CFA_OFFSET -4
.endif
1: pushl $~(vector)

2
arch/x86/kernel/irqinit_32.c
View file

@ -129,7 +129,7 @@ void __init native_init_IRQ(void)
for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) {
/* SYSCALL_VECTOR was reserved in trap_init. */
if (i != SYSCALL_VECTOR)
set_intr_gate(i, interrupt[i]);
set_intr_gate(i, interrupt[i-FIRST_EXTERNAL_VECTOR]);
}

3
arch/x86/lguest/boot.c
View file

@ -590,7 +590,8 @@ static void __init lguest_init_IRQ(void)
* a straightforward 1 to 1 mapping, so force that here. */
__get_cpu_var(vector_irq)[vector] = i;
if (vector != SYSCALL_VECTOR) {
set_intr_gate(vector, interrupt[vector]);
set_intr_gate(vector,
interrupt[vector-FIRST_EXTERNAL_VECTOR]);
set_irq_chip_and_handler_name(i, &lguest_irq_controller,
handle_level_irq,
"level");