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Subject[tip:x86/irq] x86, ioapic: Move nr_ioapic_registers calculation to mp_register_ioapic.
Commit-ID:  7716a5c4ff5f1f3dc5e9edcab125cbf7fceef0af
Gitweb: http://git.kernel.org/tip/7716a5c4ff5f1f3dc5e9edcab125cbf7fceef0af
Author: Eric W. Biederman <ebiederm@xmission.com>
AuthorDate: Tue, 30 Mar 2010 01:07:12 -0700
Committer: H. Peter Anvin <hpa@zytor.com>
CommitDate: Tue, 4 May 2010 13:35:03 -0700

x86, ioapic: Move nr_ioapic_registers calculation to mp_register_ioapic.

Now that all ioapic registration happens in mp_register_ioapic we can
move the calculation of nr_ioapic_registers there from enable_IO_APIC.
The number of ioapic registers is already calucated in mp_register_ioapic
so all that really needs to be done is to save the caluclated value
in nr_ioapic_registers.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
LKML-Reference: <1269936436-7039-11-git-send-email-ebiederm@xmission.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
arch/x86/kernel/apic/io_apic.c | 22 ++++++++--------------
1 files changed, 8 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index f807255..dae9240 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1953,20 +1953,8 @@ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };

void __init enable_IO_APIC(void)
{
- union IO_APIC_reg_01 reg_01;
int i8259_apic, i8259_pin;
int apic;
- unsigned long flags;
-
- /*
- * The number of IO-APIC IRQ registers (== #pins):
- */
- for (apic = 0; apic < nr_ioapics; apic++) {
- raw_spin_lock_irqsave(&ioapic_lock, flags);
- reg_01.raw = io_apic_read(apic, 1);
- raw_spin_unlock_irqrestore(&ioapic_lock, flags);
- nr_ioapic_registers[apic] = reg_01.bits.entries+1;
- }

if (!legacy_pic->nr_legacy_irqs)
return;
@@ -4293,6 +4281,7 @@ static int bad_ioapic(unsigned long address)
void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
{
int idx = 0;
+ int entries;

if (bad_ioapic(address))
return;
@@ -4311,9 +4300,14 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
* Build basic GSI lookup table to facilitate gsi->io_apic lookups
* and to prevent reprogramming of IOAPIC pins (PCI GSIs).
*/
+ entries = io_apic_get_redir_entries(idx);
mp_gsi_routing[idx].gsi_base = gsi_base;
- mp_gsi_routing[idx].gsi_end = gsi_base +
- io_apic_get_redir_entries(idx) - 1;
+ mp_gsi_routing[idx].gsi_end = gsi_base + entries - 1;
+
+ /*
+ * The number of IO-APIC IRQ registers (== #pins):
+ */
+ nr_ioapic_registers[idx] = entries;

if (mp_gsi_routing[idx].gsi_end > gsi_end)
gsi_end = mp_gsi_routing[idx].gsi_end;

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