Messages in this thread | | | Subject | Re: [PATCH] powerpc/mpic: Remove WHOAMI readback after EOI | From | Scott Wood <> | Date | Wed, 13 May 2015 11:33:57 -0500 |
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On Wed, 2015-05-13 at 15:23 +0300, Purcareata Bogdan wrote: > Ping? > > On 24.03.2015 12:43, Bogdan Purcareata wrote: > > After previous discussions regarding the subject [1][2], there's no clear > > explanation or reason why the call was needed in the first place. The sensible > > argument is some sort of synchronization between the CPU and the MPIC, which > > hasn't been pointed out precisely and is no longer required (at least on BookE > > platforms). > > > > The benefit of this change is saving a MMIO trap per interrupt when running in a > > KVM guest. > > > > [1] https://patchwork.ozlabs.org/patch/429098/ > > [2] https://patchwork.ozlabs.org/patch/433557/ > > > > Signed-off-by: Bogdan Purcareata <bogdan.purcareata@freescale.com> > > --- > > arch/powerpc/sysdev/mpic.c | 1 - > > 1 file changed, 1 deletion(-)
Don't top-post.
This is commit 56302c53d3dc477b8360954fc92c1dfc4fc0ec54 in Linus's tree.
-Scott
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