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authorVivek Goyal <vgoyal@in.ibm.com>2006-01-06 00:12:19 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:33:39 -0800
commit76865c3f87e825dda0c458b02f30dd8ae64b7bdc (patch)
treeeca4f00f9c8022bf2177f23ff36a27e12edbd939 /arch
parent19d534842cc39df1b568722c18f96ae24fb0e136 (diff)
downloadtalos-op-linux-76865c3f87e825dda0c458b02f30dd8ae64b7bdc.tar.gz
talos-op-linux-76865c3f87e825dda0c458b02f30dd8ae64b7bdc.zip
[PATCH] i386: ioapic virtual wire mode fix
o Currently, during kexec reboot, IOAPIC is re-programmed back to virtual wire mode if there was an i8259 connected to it. This enables getting timer interrupts in second kernel in legacy mode. o After putting into virtual wire mode, IOAPIC delivers the i8259 interrupts to CPU0. This works well for kexec but not for kdump as we might crash on a different CPU and second kernel will not see timer interrupts. o This patch modifies the redirection table entry to deliver the timer interrupts to the cpu we are rebooting (instead of hardcoding to zero). This ensures that second kernel receives timer interrupts even on a non-boot cpu. Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Cc: Andi Kleen <ak@muc.de> Cc: "Seth, Rohit" <rohit.seth@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/i386/kernel/io_apic.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index 22c8675c79f4..7554f8fd874a 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -1722,8 +1722,8 @@ void disable_IO_APIC(void)
entry.dest_mode = 0; /* Physical */
entry.delivery_mode = dest_ExtINT; /* ExtInt */
entry.vector = 0;
- entry.dest.physical.physical_dest = 0;
-
+ entry.dest.physical.physical_dest =
+ GET_APIC_ID(apic_read(APIC_ID));
/*
* Add it to the IO-APIC irq-routing table:
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