Fwd: [PATCH] x86_64: typo in __assign_irq_vector when update pos for vector and offset

[Yinghai Lu]

Please check the patch.

Also I have a question about TARGET_CPUS in io_apic.c.

for a 16 sockets system with 32 non coherent ht chain. and if every
chain have 8 irq for devices, the genapic will use physflat. and it
should use you new added "different cpu can have same vector for
different irq".  --- in the i8259.c

but the setup_IOAPIC_irqs and arch_setup_ht_irq and arch_setup_msi_irq
is still using TARGET_CPUS ( it is cpumask_of_cpu(0) for physflat), so
the assign_irq_vector will not get vector for them, becase cpu 0 does
not have that much vector to be alllocated. and later
setup_affinity_xxx_irq can not be used because before irq is not there
and show on /proc/interrupts.

So I want to
1. for arch_setup_ht_irq and arch_setup_msi_irq, we can use the dev it
takes to get bus and use bus->sysdata to get bus->node mapping that is
created in fillin_cpumask_to_bus, to get real target_cpus instead of
cpu0.
2. for ioapics, may need to add another array,
ioapic_node[MAX_IOAPICS], and use ioapic address to get the numa node
for it. So later can use it to get real targets cpus when need to use
TARGET_CPUS.

Please comments.

Thanks

Yinghai Lu





---------- Forwarded message ----------
From: yhlu <yhlu.kernel@xxxxxxxxx>
Date: Oct 15, 2006 12:21 PM
Subject: re: [PATCH] x86_64: typo in __assign_irq_vector when update
pos for vector and offset
To: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, Andi Kleen <ak@xxxxxx>
Cc: linux kernel mailing list <linux-kernel@xxxxxxxxxxxxxxx>,
yhlu.kernel@xxxxxxxxx


Please use this one

typo with cpu instead of new_cpu

Signed-off-by: Yinghai Lu <yinghai.lu@xxxxxxx>

diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 44b55f8..756d097 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -651,12 +651,12 @@ next:
              if (vector == IA32_SYSCALL_VECTOR)
                      goto next;
              for_each_cpu_mask(new_cpu, domain)
-                       if (per_cpu(vector_irq, cpu)[vector] != -1)
+                       if (per_cpu(vector_irq, new_cpu)[vector] != -1)
                              goto next;
              /* Found one! */
              for_each_cpu_mask(new_cpu, domain) {
-                       pos[cpu].vector = vector;
-                       pos[cpu].offset = offset;
+                       pos[new_cpu].vector = vector;
+                       pos[new_cpu].offset = offset;
              }
              if (old_vector >= 0) {
                      int old_cpu;
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 44b55f8..756d097 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -651,12 +651,12 @@ next:
 		if (vector == IA32_SYSCALL_VECTOR)
 			goto next;
 		for_each_cpu_mask(new_cpu, domain)
-			if (per_cpu(vector_irq, cpu)[vector] != -1)
+			if (per_cpu(vector_irq, new_cpu)[vector] != -1)
 				goto next;
 		/* Found one! */
 		for_each_cpu_mask(new_cpu, domain) {
-			pos[cpu].vector = vector;
-			pos[cpu].offset = offset;
+			pos[new_cpu].vector = vector;
+			pos[new_cpu].offset = offset;
 		}
 		if (old_vector >= 0) {
 			int old_cpu;