From: Greg KH <gregkh@suse.de>
To: linux-kernel@vger.kernel.org, stable@kernel.org, jejb@kernel.org
Cc: Justin Forbes <jmforbes@linuxtx.org>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
"Theodore Ts'o" <tytso@mit.edu>,
Randy Dunlap <rdunlap@xenotime.net>,
Dave Jones <davej@redhat.com>,
Chuck Wolber <chuckw@quantumlinux.com>,
Chris Wedgwood <reviews@ml.cw.f00f.org>,
Michael Krufky <mkrufky@linuxtv.org>,
Chuck Ebbert <cebbert@redhat.com>,
Domenico Andreoli <cavokz@gmail.com>, Willy Tarreau <w@1wt.eu>,
Rodrigo Rubira Branco <rbranco@la.checkpoint.com>,
Jake Edge <jake@lwn.net>, Eugene Teo <eteo@redhat.com>,
torvalds@linux-foundation.org, akpm@linux-foundation.org,
alan@lxorguk.ukuu.org.uk, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@elte.hu>
Subject: [patch 12/14] x86: improve UP kernel when CPU-hotplug and SMP is enabled
Date: Thu, 16 Oct 2008 10:56:46 -0700 [thread overview]
Message-ID: <20081016175646.GM12850@suse.de> (raw)
In-Reply-To: <20081016175525.GA12850@suse.de>
[-- Attachment #1: x86-improve-up-kernel-when-cpu-hotplug-and-smp-is-enabled.patch --]
[-- Type: text/plain, Size: 1079 bytes --]
2.6.27-stable review patch. If anyone has any objections, please let us
know.
------------------
From: Thomas Gleixner <tglx@linutronix.de>
commit 649c6653fa94ec8f3ea32b19c97b790ec4e8e4ac upstream
num_possible_cpus() can be > 1 when disabled CPUs have been accounted.
Disabled CPUs are not in the cpu_present_map, so we can use
num_present_cpus() as a safe indicator to switch to UP alternatives.
Reported-by: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
arch/x86/kernel/alternative.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -444,7 +444,7 @@ void __init alternative_instructions(voi
_text, _etext);
/* Only switch to UP mode if we don't immediately boot others */
- if (num_possible_cpus() == 1 || setup_max_cpus <= 1)
+ if (num_present_cpus() == 1 || setup_max_cpus <= 1)
alternatives_smp_switch(0);
}
#endif
--
next prev parent reply other threads:[~2008-10-16 18:04 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20081016174814.734527827@mini.kroah.org>
2008-10-16 17:55 ` [patch 00/14] 2.6.27-stable review Greg KH
2008-10-16 17:55 ` [patch 01/14] sched_rt.c: resch needed in rt_rq_enqueue() for the root rt_rq Greg KH
2008-10-16 17:56 ` [patch 02/14] x86: Reserve FIRST_DEVICE_VECTOR in used_vectors bitmap Greg KH
2008-10-16 17:56 ` [patch 03/14] mac80211: fix two issues in debugfs Greg KH
2008-10-16 17:56 ` Greg KH
2008-10-16 17:56 ` [patch 04/14] Fix barrier fail detection in XFS Greg KH
2008-10-16 17:56 ` [patch 05/14] tty: Termios locking - sort out real_tty confusions and lock reads Greg KH
2008-10-16 17:56 ` [patch 06/14] CIFS: make sure we have the right resume info before calling CIFSFindNext Greg KH
2008-10-16 17:56 ` [patch 07/14] rfkill: update LEDs for all state changes Greg KH
2008-10-16 17:56 ` [patch 08/14] libertas: clear current command on card removal Greg KH
2008-10-16 17:56 ` [patch 09/14] b43legacy: Fix failure in rate-adjustment mechanism Greg KH
2008-10-16 17:56 ` [patch 10/14] x86, early_ioremap: fix fencepost error Greg KH
2008-10-16 17:56 ` [patch 11/14] x86: SB450: skip IRQ0 override if it is not routed to INT2 of IOAPIC Greg KH
2008-10-16 17:56 ` Greg KH [this message]
2008-10-16 17:56 ` [patch 13/14] sky2: Fix WOL regression Greg KH
2008-10-16 17:56 ` [patch 14/14] netdrvr: atl1e: Dont take the mdio_lock in atl1e_probe Greg KH
2008-10-16 22:49 ` [patch 00/14] 2.6.27-stable review Stefan Lippers-Hollmann
2008-10-16 23:23 ` Greg KH
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