p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

x86/apic: Mark single target interrupts 

If the interrupt destination mode of the APIC is physical then the
effective affinity is restricted to a single CPU.

Mark the interrupt accordingly in the domain allocation code, so the core
code can avoid pointless affinity setting attempts.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Hellwig <hch@lst.de>
Link: http://lkml.kernel.org/r/20170619235447.508846202@linutronix.de
This commit is contained in:
Thomas Gleixner 2017-06-20 01:37:54 +02:00
parent 8f31a9845d
commit 3ca57222c3
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/x86/kernel/apic/vector.c
View File

@ -371,6 +371,13 @@ static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq,
irq_data); irq_data);
if (err) if (err)
goto error; goto error;
/*
* If the apic destination mode is physical, then the
* effective affinity is restricted to a single target
* CPU. Mark the interrupt accordingly.
*/
if (!apic->irq_dest_mode)
irqd_set_single_target(irq_data);
} }
return 0; return 0;