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x86/irq: Reorganize the search in assign_irq_vector

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commit 95ffeb4b5b upstream.

Split out the code which advances the target cpu for the search so we can
reuse it for the next patch which adds an early validation check for the
vectormask which we get from the apic.

Add comments while at it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Borislav Petkov <bp@alien8.de>
Tested-by: Joe Lawrence <joe.lawrence@stratus.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jeremiah Mahler <jmmahler@gmail.com>
Cc: andy.shevchenko@gmail.com
Cc: Guenter Roeck <linux@roeck-us.net>
Link: http://lkml.kernel.org/r/20151231160106.484562040@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Gleixner 2015-12-31 16:30:47 +00:00 committed by Greg Kroah-Hartman
parent f6e9ce2b06
commit cb987d4822
1 changed files with 16 additions and 8 deletions
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24
arch/x86/kernel/apic/vector.c
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@ -155,14 +155,9 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d,
vector = FIRST_EXTERNAL_VECTOR + offset;
}
if (unlikely(current_vector == vector)) {
cpumask_or(searched_cpumask, searched_cpumask,
vector_cpumask);
cpumask_andnot(vector_cpumask, mask, searched_cpumask);
cpu = cpumask_first_and(vector_cpumask,
cpu_online_mask);
continue;
}
/* If the search wrapped around, try the next cpu */
if (unlikely(current_vector == vector))
goto next_cpu;
if (test_bit(vector, used_vectors))
goto next;
@ -184,6 +179,19 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d,
d->cfg.vector = vector;
cpumask_copy(d->domain, vector_cpumask);
goto success;
next_cpu:
/*
* We exclude the current @vector_cpumask from the requested
* @mask and try again with the next online cpu in the
* result. We cannot modify @mask, so we use @vector_cpumask
* as a temporary buffer here as it will be reassigned when
* calling apic->vector_allocation_domain() above.
*/
cpumask_or(searched_cpumask, searched_cpumask, vector_cpumask);
cpumask_andnot(vector_cpumask, mask, searched_cpumask);
cpu = cpumask_first_and(vector_cpumask, cpu_online_mask);
continue;
}
return -ENOSPC;