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linux/arch/x86/kernel/apic
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Linus Torvalds 83d349f35e x86: don't send an IPI to the empty set of CPU's 
The default_send_IPI_mask_logical() function uses the "flat" APIC mode
to send an IPI to a set of CPU's at once, but if that set happens to be
empty, some older local APIC's will apparently be rather unhappy.  So
just warn if a caller gives us an empty mask, and ignore it.

This fixes a regression in 2.6.30.x, due to commit 4595f9620 ("x86:
change flush_tlb_others to take a const struct cpumask"), documented
here:

	http://bugzilla.kernel.org/show_bug.cgi?id=13933

which causes a silent lock-up.  It only seems to happen on PPro, P2, P3
and Athlon XP cores.  Most developers sadly (or not so sadly, if you're
a developer..) have more modern CPU's.  Also, on x86-64 we don't use the
flat APIC mode, so it would never trigger there even if the APIC didn't
like sending an empty IPI mask.

Reported-by: Pavel Vilim <wylda@volny.cz>
Reported-and-tested-by: Thomas Björnell <thomas.bjornell@gmail.com>
Reported-and-tested-by: Martin Rogge <marogge@onlinehome.de>
Cc: Mike Travis <travis@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-08-21 09:23:57 -07:00
..
apic_flat_64.c x86: don't call read_apic_id if !cpu_has_apic 2009-05-18 08:43:25 +02:00
apic.c x86: Remove unused variable disable_x2apic 2009-07-03 14:34:27 +02:00
bigsmp_32.c cpumask: use new cpumask functions throughout x86 2009-03-13 14:49:54 +10:30
es7000_32.c x86: Fix false positive section mismatch in es7000_32.c 2009-07-13 11:03:26 +02:00
io_apic.c x86, UV: Complete IRQ interrupt migration in arch_enable_uv_irq() 2009-08-04 16:32:52 +02:00
ipi.c x86: don't send an IPI to the empty set of CPU's 2009-08-21 09:23:57 -07:00
Makefile x86, apic: separate 32-bit setup functionality out of apic_32.c 2009-02-17 23:12:48 +01:00
nmi.c Merge branch 'linus' into x86/mce3 2009-06-11 23:31:52 +02:00
numaq_32.c x86, apic: Fix false positive section mismatch in numaq_32.c 2009-07-13 11:03:27 +02:00
probe_32.c x86: Remove duplicated #include's 2009-06-17 19:02:35 +02:00
probe_64.c x86: x2apic, IR: Clean up X86_X2APIC and INTR_REMAP config checks 2009-04-21 09:08:25 +02:00
summit_32.c x86: Remove duplicated #include's 2009-06-17 19:02:35 +02:00
x2apic_cluster.c x86: Fix MSI-X initialization by using online_mask for x2apic target_cpus 2009-08-08 17:04:58 +02:00
x2apic_phys.c x86: Fix MSI-X initialization by using online_mask for x2apic target_cpus 2009-08-08 17:04:58 +02:00
x2apic_uv_x.c x86: Annotate section mismatch warnings in kernel/apic/x2apic_uv_x.c 2009-08-16 19:44:13 +02:00