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Siddha, Suresh B 48d8d7ee5d x86_64 irq: use mask/unmask and proper locking in fixup_irqs() ... Force irq migration path during cpu offline, is not using proper locks and irq_chip mask/unmask routines. This will result in some races(especially the device generating the interrupt can see some inconsistent state, resulting in issues like stuck irq,..). Appended patch fixes the issue by taking proper lock and encapsulating irq_chip set_affinity() with a mask() before and an unmask() after. This fixes a MSI irq stuck issue reported by Darrick Wong. There are several more general bugs in this area(irq migration in the process context). For example, 1. Possibility of missing edge triggered irq. 2. Reliable method of migrating level triggered irq in the process context. We plan to look and close these in the near future. Eric says: In addition even with the fix from Suresh there is still at least one nasty hardware race in fixup_irqs(). However we exercise that code path rarely enough that we are unlikely to hit it in the real world, and that race seems to have existed since the code was merged. And a fix for that is not coming soon as it is an open investigation area if we can fix irq migration to work outside of irq context or if we have to rework the requirements imposed by the generic cpu hotplug and layer on fixup_irqs(). So this may come up again. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Reported-and-tested-by: Darrick Wong <djwong@us.ibm.com> Cc: Andi Kleen <ak@suse.de> Acked-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		18 years ago
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acpi	…
cpufreq	…
Makefile	…
aperture.c	x86_64: off-by-two error in aperture.c	18 years ago
apic.c	…
asm-offsets.c	…
audit.c	…
bugs.c	x86_64: Add asm/mtrr.h include for some builds	18 years ago
crash.c	…
crash_dump.c	…
e820.c	…
early-quirks.c	…
early_printk.c	x86_64: early_print kernel console should send CRLF not LFCR	18 years ago
entry.S	x86_64: Ignore compat mode SYSCALL when IA32_EMULATION is not defined	18 years ago
genapic.c	…
genapic_flat.c	…
head.S	…
head64.c	…
hpet.c	…
i387.c	…
i8259.c	…
init_task.c	…
io_apic.c	x86_64: set the irq_chip name for lapic	18 years ago
ioport.c	…
irq.c	x86_64 irq: use mask/unmask and proper locking in fixup_irqs()	18 years ago
k8.c	Avoid zero size allocation in cache_k8_northbridges()	18 years ago
kprobes.c	…
ldt.c	…
machine_kexec.c	…
mce.c	x86_64: fix misplaced `continue' in mce.c	18 years ago
mce_amd.c	…
mce_intel.c	…
module.c	…
mpparse.c	…
nmi.c	…
pci-calgary.c	…
pci-dma.c	x86: Disable DAC on VIA bridges	18 years ago
pci-gart.c	x86_64: off-by-two error in aperture.c	18 years ago
pci-nommu.c	…
pci-swiotlb.c	…
pmtimer.c	…
process.c	…
ptrace.c	…
reboot.c	Detach sched.h from mm.h	18 years ago
relocate_kernel.S	…
setup.c	x86_64: Don't call mtrr_bp_init from identify_cpu	18 years ago
setup64.c	x86_64: Ignore compat mode SYSCALL when IA32_EMULATION is not defined	18 years ago
signal.c	…
smp.c	…
smpboot.c	…
stacktrace.c	…
suspend.c	…
suspend_asm.S	…
sys_x86_64.c	…
syscall.c	…
tce.c	…
time.c	…
trampoline.S	…
traps.c	x86_64: oops_begin() fix	18 years ago
tsc.c	…
tsc_sync.c	…
verify_cpu.S	…
vmlinux.lds.S	all-archs: consolidate .data section definition in asm-generic	18 years ago
vsmp.c	…
vsyscall.c	x86_64: vsyscall time() fix	18 years ago
x8664_ksyms.c	…