[PATCH 2/4] powerpc/mpic: Use the MPIC_LARGE_VECTORS flag for FSL MPIC.

Stuart Yoder b08248 at gmail.com
Wed Mar 28 02:21:28 EST 2012

On Tue, Mar 27, 2012 at 8:30 AM, Kumar Gala <galak at kernel.crashing.org> wrote:
> On Mar 27, 2012, at 7:15 AM, Varun Sethi wrote:
>> FSL MPIC supports 16 bit vectors so our vector number space isn't
>> restricted to 256 vectors. We should use the MPIC_LARG_VECTORS flag
>> while intializing the MPIC. This also prevents us from eating in to
>> hardware vector number space (MSIs) while setting up internal sources.
> What is driving this change?

Whats driving the change is proper handling of error interrupts.   Right
now error interrupts (muxed on int 16) are treated as a shared
interrupt source.   We want each to be handled as a individual interrupt
source...thus the desire to support more than 256 interrupts.


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