From: Scott Wood <scottwood@freescale.com>
To: Purcareata Bogdan <b43198@freescale.com>
Cc: linuxppc-dev@lists.ozlabs.org,
Bogdan Purcareata <bogdan.purcareata@freescale.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] powerpc/mpic: Remove WHOAMI readback after EOI
Date: Wed, 13 May 2015 11:33:57 -0500 [thread overview]
Message-ID: <1431534837.3868.42.camel@freescale.com> (raw)
In-Reply-To: <55534225.1050305@freescale.com>
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
prev parent reply other threads:[~2015-05-13 16:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-24 10:43 [PATCH] powerpc/mpic: Remove WHOAMI readback after EOI Bogdan Purcareata
2015-05-13 12:23 ` Purcareata Bogdan
2015-05-13 16:33 ` Scott Wood [this message]
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