From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] ARM: logical_cpu_map: decouple CPU mapping from SMP
Date: Mon, 16 Jan 2012 16:12:25 +0000 [thread overview]
Message-ID: <20120116161225.GK9068@mudshark.cambridge.arm.com> (raw)
In-Reply-To: <4F144BDB.1090908@arm.com>
On Mon, Jan 16, 2012 at 04:10:03PM +0000, Marc Zyngier wrote:
> On 16/01/12 15:45, Will Deacon wrote:
> > It turns out that the logical CPU mapping is useful even when !CONFIG_SMP
> > for manipulation of devices like interrupt and power controllers when
> > running a UP kernel on a CPU other than 0. This can happen when kexecing
> > a UP image from an SMP kernel.
> >
> > In the future, multi-cluster systems running AMP configurations will
> > require something similar for mapping cluster IDs, so it makes sense to
> > decouple this logic in preparation for this support.
> >
> > Cc: Marc Zyngier <marc.zyngier@arm.com>
> > Cc: Yang Bai <hamo.by@gmail.com>
> > Reported-by: Joerg Roedel <joerg.roedel@amd.com>
> > Signed-off-by: Will Deacon <will.deacon@arm.com>
> > ---
> > arch/arm/common/gic.c | 7 ++-----
> > arch/arm/include/asm/smp.h | 6 ------
> > arch/arm/include/asm/smp_plat.h | 6 ++++++
> > arch/arm/kernel/setup.c | 14 ++++++++++++++
> > arch/arm/kernel/smp.c | 14 --------------
> > arch/arm/mach-exynos/hotplug.c | 1 +
> > arch/arm/mach-exynos/platsmp.c | 1 +
> > arch/arm/mach-highbank/highbank.c | 3 +--
> > arch/arm/mach-imx/src.c | 5 +----
> > arch/arm/mach-msm/hotplug.c | 1 +
> > arch/arm/mach-msm/platsmp.c | 1 +
> > arch/arm/mach-realview/hotplug.c | 1 +
> > arch/arm/mach-shmobile/smp-sh73a0.c | 1 +
> > arch/arm/mach-ux500/hotplug.c | 1 +
> > arch/arm/mach-ux500/platsmp.c | 1 +
> > arch/arm/mach-vexpress/hotplug.c | 1 +
> > arch/arm/plat-versatile/platsmp.c | 1 +
> > 17 files changed, 34 insertions(+), 31 deletions(-)
>
> You may want to also add a #include <asm/smp_plat.h> to
> arch/arm/mach-shmobile/smp-r8a7779.c (a newcomer in Linus' tree).
Cheers Marc, I didn't spot this guy. I'll add that for v2.
> Otherwise:
> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Thanks,
Will
next prev parent reply other threads:[~2012-01-16 16:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-16 15:45 [PATCH 1/2] ARM: logical_cpu_map: decouple CPU mapping from SMP Will Deacon
2012-01-16 15:45 ` [PATCH 2/2] ARM: SCU: use cpu_logical_map for per-CPU low power mode Will Deacon
2012-01-16 16:10 ` [PATCH 1/2] ARM: logical_cpu_map: decouple CPU mapping from SMP Marc Zyngier
2012-01-16 16:12 ` Will Deacon [this message]
2012-01-17 7:43 ` Yang Bai
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