From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Hirokazu Takata <takata@linux-m32r.org>,
Richard Kuo <rkuo@codeaurora.org>,
David Howells <dhowells@redhat.com>, Bob Liu <lliubbo@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Richard Weinberger <richard@nod.at>,
Jesper Nilsson <jesper.nilsson@axis.com>,
"James E.J. Bottomley" <jejb@parisc-linux.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Matt Turner <mattst88@gmail.com>,
nikunj@linux.vnet.ibm.com
Subject: Re: [PATCH 03/27] smpboot: Define and use cpu_state per-cpu variable in generic code
Date: Fri, 01 Jun 2012 18:25:27 +0530 [thread overview]
Message-ID: <4FC8BBBF.6090701@linux.vnet.ibm.com> (raw)
In-Reply-To: <20120601122554.GA25595@n2100.arm.linux.org.uk>
On 06/01/2012 05:55 PM, Russell King - ARM Linux wrote:
> On Fri, Jun 01, 2012 at 05:49:14PM +0530, Srivatsa S. Bhat wrote:
>> Adding arch maintainers to Cc, which I had missed earlier. No changes to the
>> patch.
>
> Could someone explain what this variable does - afaics this patch adds
> this per-cpu variable to all SMP architectures where its required or
> not, and (so far) the generic code just writes one value to it.
>
Several architectures use this per-cpu variable to track the state of the cpu
(like CPU_DEAD), particularly to deal with cpu offline.
(At this point, we have just tried to generalize code without any major
functional changes.)
> Are there plans to make use of this in other generic code?
>
The idea of this patchset is to make smp booting and cpu hotplug code as
generic as possible and eventually have _one_ implementation in the generic
code which can be reused by all architectures that want it.
And this patchset generalizes only the booting of secondary cpus. But in
future, we can use this as a base and implement cpu hotplug handling in
generic code, where this variable will become more useful.
Regards,
Srivatsa S. Bhat
prev parent reply other threads:[~2012-06-01 12:56 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-01 9:10 [PATCH 00/27] Generic framework for SMP booting/CPU hotplug related code Srivatsa S. Bhat
2012-06-01 9:10 ` [PATCH 01/27] smpboot: Provide a generic method to boot secondary processors Srivatsa S. Bhat
2012-06-01 12:09 ` Srivatsa S. Bhat
2012-06-03 8:51 ` Yong Zhang
2012-06-03 11:22 ` Srivatsa S. Bhat
2012-06-04 2:18 ` Yong Zhang
2012-06-03 8:53 ` Yong Zhang
2012-06-03 11:33 ` Srivatsa S. Bhat
2012-06-03 11:39 ` Russell King - ARM Linux
2012-06-03 12:05 ` Srivatsa S. Bhat
2012-06-01 16:51 ` Sam Ravnborg
2012-06-01 22:29 ` Srivatsa S. Bhat
2012-06-04 10:32 ` Thomas Gleixner
2012-06-04 13:07 ` Srivatsa S. Bhat
2012-06-04 13:18 ` Thomas Gleixner
2012-06-04 16:53 ` Srivatsa S. Bhat
2012-06-05 5:11 ` Yong Zhang
2012-06-05 6:07 ` Srivatsa S. Bhat
2012-06-01 16:53 ` Sam Ravnborg
2012-06-01 22:41 ` Srivatsa S. Bhat
2012-06-02 15:16 ` Sam Ravnborg
2012-06-02 15:34 ` Srivatsa S. Bhat
2012-06-01 9:10 ` [PATCH 02/27] smpboot: Add provisions for arch-specific locking around cpu_online_mask Srivatsa S. Bhat
2012-06-01 12:12 ` Srivatsa S. Bhat
2012-06-01 9:11 ` [PATCH 04/27] smpboot, x86, xen: Determine smp booting implementations at run-time Srivatsa S. Bhat
2012-06-01 9:11 ` [PATCH 05/27] xen, cpu hotplug: Don't call cpu_bringup() in xen_play_dead() Srivatsa S. Bhat
2012-06-01 12:59 ` [Xen-devel] " Jan Beulich
2012-06-01 15:13 ` Srivatsa S. Bhat
2012-06-01 15:36 ` Jan Beulich
2012-06-02 18:06 ` Srivatsa S. Bhat
2012-06-05 16:49 ` Konrad Rzeszutek Wilk
2012-06-05 17:36 ` Srivatsa S. Bhat
2012-06-05 17:40 ` Thomas Gleixner
2012-06-05 17:48 ` Srivatsa S. Bhat
2012-06-01 9:11 ` [PATCH 06/27] xen, smpboot: Use generic SMP booting infrastructure Srivatsa S. Bhat
2012-06-01 9:11 ` [PATCH 07/27] x86, " Srivatsa S. Bhat
2012-06-04 14:29 ` Thomas Gleixner
2012-06-04 17:00 ` Srivatsa S. Bhat
2012-06-01 9:12 ` [PATCH 08/27] m32r: Fix horrible logic in smp_prepare_cpus() Srivatsa S. Bhat
2012-06-01 9:12 ` [PATCH 09/27] m32r, smpboot: Use generic SMP booting infrastructure Srivatsa S. Bhat
2012-06-01 9:12 ` [PATCH 10/27] mips, " Srivatsa S. Bhat
2012-06-03 8:25 ` Yong Zhang
2012-06-03 11:48 ` Srivatsa S. Bhat
2012-06-04 2:17 ` Yong Zhang
2012-06-01 9:12 ` [PATCH 11/27] sh, " Srivatsa S. Bhat
2012-06-01 9:12 ` [PATCH 12/27] tile, " Srivatsa S. Bhat
2012-06-01 18:07 ` Chris Metcalf
2012-06-01 9:13 ` [PATCH 13/27] hexagon, " Srivatsa S. Bhat
2012-06-01 9:13 ` [PATCH 14/27] ia64: Move holding of vector_lock to __setup_vector_irq() Srivatsa S. Bhat
2012-06-01 9:13 ` [PATCH 15/27] ia64, smpboot: Use generic SMP booting infrastructure Srivatsa S. Bhat
2012-06-01 9:13 ` [PATCH 16/27] mn10300: Fix horrible logic in smp_prepare_cpus() Srivatsa S. Bhat
2012-06-01 9:14 ` [PATCH 17/27] mn10300, smpboot: Use generic SMP booting infrastructure Srivatsa S. Bhat
2012-06-03 8:33 ` Yong Zhang
2012-06-03 11:50 ` Srivatsa S. Bhat
2012-06-01 9:14 ` [PATCH 18/27] powerpc, " Srivatsa S. Bhat
2012-06-02 6:14 ` Paul Mackerras
2012-06-01 9:14 ` [PATCH 19/27] blackfin, " Srivatsa S. Bhat
2012-06-01 9:14 ` [PATCH 20/27] sparc64, " Srivatsa S. Bhat
2012-06-01 17:55 ` David Miller
2012-06-01 22:44 ` [UPDATED PATCH " Srivatsa S. Bhat
2012-06-01 22:52 ` David Miller
2012-06-01 9:15 ` [PATCH 21/27] sparc32, " Srivatsa S. Bhat
2012-06-01 17:56 ` David Miller
2012-06-01 18:54 ` Sam Ravnborg
2012-06-01 22:47 ` [UPDATED PATCH " Srivatsa S. Bhat
2012-06-01 22:53 ` David Miller
2012-06-01 23:17 ` Srivatsa S. Bhat
2012-06-02 6:52 ` Sam Ravnborg
2012-06-02 7:44 ` Sam Ravnborg
2012-06-02 8:01 ` Srivatsa S. Bhat
2012-06-02 8:14 ` Srivatsa S. Bhat
2012-06-02 15:13 ` Sam Ravnborg
2012-06-02 15:58 ` Srivatsa S. Bhat
2012-06-02 16:23 ` Sam Ravnborg
2012-06-02 16:34 ` Srivatsa S. Bhat
2012-06-03 21:17 ` [PATCH] sparc32: refactor smp boot Sam Ravnborg
2012-06-04 1:04 ` David Miller
2012-06-04 6:48 ` Srivatsa S. Bhat
2012-06-01 9:15 ` [PATCH 22/27] um, smpboot: Use generic SMP booting infrastructure Srivatsa S. Bhat
2012-06-01 9:15 ` [PATCH 23/27] cris, " Srivatsa S. Bhat
2012-06-03 8:41 ` Yong Zhang
2012-06-03 11:52 ` Srivatsa S. Bhat
2012-06-01 9:15 ` [PATCH 24/27] parisc, " Srivatsa S. Bhat
2012-06-01 9:16 ` [PATCH 25/27] s390, " Srivatsa S. Bhat
2012-06-01 10:45 ` Heiko Carstens
2012-06-01 9:16 ` [PATCH 26/27] arm, " Srivatsa S. Bhat
2012-06-01 11:04 ` Russell King - ARM Linux
2012-06-01 9:16 ` [PATCH 27/27] alpha, " Srivatsa S. Bhat
[not found] ` <20120601091038.31979.67878.stgit@srivatsabhat.in.ibm.com>
2012-06-01 12:19 ` [PATCH 03/27] smpboot: Define and use cpu_state per-cpu variable in generic code Srivatsa S. Bhat
2012-06-01 12:25 ` Russell King - ARM Linux
2012-06-01 12:55 ` Srivatsa S. Bhat [this message]
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