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

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Date:	Mon, 16 Oct 2006 08:26:08 -0700
From:	"Yinghai Lu" <yinghai.lu@....com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Andi Kleen" <ak@....de>
Cc:	"linux kernel mailing list" <linux-kernel@...r.kernel.org>,
	yhlu.kernel@...il.com, yinghai.lu@....com
Subject: Fwd: [PATCH] x86_64: typo in __assign_irq_vector when update pos for vector and offset

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@...il.com>
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@...ssion.com>, Andi Kleen <ak@....de>
Cc: linux kernel mailing list <linux-kernel@...r.kernel.org>,
yhlu.kernel@...il.com

Please use this one

typo with cpu instead of new_cpu

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

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;

View attachment "io_apic_x.diff" of type "text/x-patch" (644 bytes)