linux/arch
Vivek Goyal 1a75a3f068 [PATCH] i386 kdump timer vector lockup fix
Porting the patch I posted for x86_64 to i386.

http://marc.theaimsgroup.com/?l=linux-kernel&m=114178139610707&w=2

o While using kdump, after a system crash when second kernel boots, timer
  vector gets (0x31) locked and CPU does not see timer interrupts
  travelling from IOAPIC to APIC.  Currently it does not lead to boot
  failure in second kernel as timer interrupts continues to come as ExtInt
  through LAPIC directly, but fixing it is good in case some boards do not
  support the other mode.

o After a system crash, it is not safe to service interrupts any more,
  hence interrupts are disabled.  This leads to pending interrupts at
  LAPIC.  LAPIC sends these interrupts to the CPU during early boot of
  second kernel.  Other pending interrupts are discarded saying unexpected
  trap but timer interrupt is serviced and CPU does not issue an LAPIC EOI
  because it think this interrupt came from i8259 and sends ack to 8259.
  This leads to vector 0x31 locking as LAPIC does not clear respective ISR
  and keeps on waiting for EOI.

o This patch issues extra EOI for the pending interrupts who have ISR set.

o Though today only timer seems to be the special case because in early
  boot it thinks interrupts are coming from i8259 and uses
  mask_and_ack_8259A() as ack handler and does not issue LAPIC EOI.  But
  probably doing it in generic manner for all vectors makes sense.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-31 12:18:50 -08:00
..
alpha [PATCH] RTC: Remove RTC UIP synchronization on Alpha 2006-03-28 09:16:01 -08:00
arm Merge master.kernel.org:/home/rmk/linux-2.6-arm 2006-03-28 13:53:03 -08:00
arm26 [PATCH] unify PFN_* macros 2006-03-27 08:44:48 -08:00
cris [PATCH] unify PFN_* macros 2006-03-27 08:44:48 -08:00
frv [PATCH] bitops: frv: use generic bitops 2006-03-26 08:57:12 -08:00
h8300 [PATCH] bitops: h8300: use generic bitops 2006-03-26 08:57:12 -08:00
i386 [PATCH] i386 kdump timer vector lockup fix 2006-03-31 12:18:50 -08:00
ia64 Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 2006-03-30 12:38:18 -08:00
m32r [PATCH] unify PFN_* macros 2006-03-27 08:44:48 -08:00
m68k [PATCH] RTC: Remove some duplicate BCD definitions 2006-03-28 09:16:01 -08:00
m68knommu [PATCH] bitops: m68knommu: use generic bitops 2006-03-26 08:57:13 -08:00
mips [PATCH] remove add_parent()'s parent argument 2006-03-28 18:36:41 -08:00
parisc [PARISC] Enabled some NLS modules in a500, b180 and c3000 defconfigs 2006-03-30 17:48:58 +00:00
powerpc [PATCH] powerpc: Remove oprofile spinlock backtrace code 2006-03-29 13:44:16 +11:00
ppc [PATCH] for_each_possible_cpu: ppc 2006-03-29 13:44:16 +11:00
s390 [PATCH] Notifier chain update: API changes 2006-03-27 08:44:50 -08:00
sh [PATCH] for_each_possible_cpu: sh 2006-03-31 12:18:50 -08:00
sh64 [PATCH] RTC: Remove some duplicate BCD definitions 2006-03-28 09:16:01 -08:00
sparc [PATCH] bitops: sparc: use generic bitops 2006-03-26 08:57:14 -08:00
sparc64 [PATCH] RTC: Remove RTC UIP synchronization on Sparc64 2006-03-28 09:16:00 -08:00
um [PATCH] pidhash: don't count idle threads 2006-03-28 18:36:41 -08:00
v850 [PATCH] bitops: v850: use generic bitops 2006-03-26 08:57:14 -08:00
x86_64 [PATCH] RTC: Remove RTC UIP synchronization on x86_64 2006-03-28 09:16:00 -08:00
xtensa [PATCH] Notifier chain update: API changes 2006-03-27 08:44:50 -08:00