From dbeb2be21d678c49a8d8bbf774903df15dd55474 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Fri, 19 Oct 2007 20:35:03 +0200 Subject: i386: introduce "used_vectors" bitmap which can be used to reserve vectors. This simplifies the io_apic.c __assign_irq_vector() logic and removes the explicit SYSCALL_VECTOR check, and also allows for vectors to be reserved by other mechanisms (ie. lguest). [ tglx: arch/x86 adaptation ] Signed-off-by: Rusty Russell Signed-off-by: Andi Kleen Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/kernel/io_apic_32.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) (limited to 'arch/x86/kernel/io_apic_32.c') diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c index 5f10c7189534..0c55e9d86f69 100644 --- a/arch/x86/kernel/io_apic_32.c +++ b/arch/x86/kernel/io_apic_32.c @@ -1198,7 +1198,7 @@ static u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 } static int __assign_irq_vector(int irq) { static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0; - int vector, offset, i; + int vector, offset; BUG_ON((unsigned)irq >= NR_IRQ_VECTORS); @@ -1215,11 +1215,8 @@ next: } if (vector == current_vector) return -ENOSPC; - if (vector == SYSCALL_VECTOR) + if (test_and_set_bit(vector, used_vectors)) goto next; - for (i = 0; i < NR_IRQ_VECTORS; i++) - if (irq_vector[i] == vector) - goto next; current_vector = vector; current_offset = offset; @@ -2295,6 +2292,12 @@ static inline void __init check_timer(void) void __init setup_IO_APIC(void) { + int i; + + /* Reserve all the system vectors. */ + for (i = FIRST_SYSTEM_VECTOR; i < NR_VECTORS; i++) + set_bit(i, used_vectors); + enable_IO_APIC(); if (acpi_ioapic) -- cgit v1.2.3