From: Greg Kroah-Hartman <gregkh@suse.de>
To: linux-kernel@vger.kernel.org, stable@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>,
torvalds@osdl.org, akpm@osdl.org, alan@lxorguk.ukuu.org.uk,
dsd@gentoo.org, venkatesh.pallipadi@intel.com
Subject: [patch 01/19] ACPI: Add support for FADT P_LVL2_UP flag
Date: Fri, 23 Dec 2005 14:47:37 -0800 [thread overview]
Message-ID: <20051223224737.GA19057@kroah.com> (raw)
In-Reply-To: <20051223224712.GA18975@kroah.com>
[-- Attachment #1: acpi-add-support-for-fadt-p_lvl2_up-flag.patch --]
[-- Type: text/plain, Size: 1829 bytes --]
-stable review patch. If anyone has any objections, please let us know.
------------------
From: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
[ACPI] Add support for FADT P_LVL2_UP flag
which tells us if C2 is valid for UP-only, or SMP.
As there is no separate bit for C3, use P_LVL2_UP
bit to cover both C2 and C3.
http://bugzilla.kernel.org/show_bug.cgi?id=5165
(cherry picked from 28b86b368af3944eb383078fc5797caf2dc8ce44 commit)
Signed-off-by: Venkatesh Pallipadi<venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/acpi/processor_idle.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
--- linux-2.6.14.4.orig/drivers/acpi/processor_idle.c
+++ linux-2.6.14.4/drivers/acpi/processor_idle.c
@@ -261,6 +261,16 @@ static void acpi_processor_idle(void)
cx->usage++;
+#ifdef CONFIG_HOTPLUG_CPU
+ /*
+ * Check for P_LVL2_UP flag before entering C2 and above on
+ * an SMP system. We do it here instead of doing it at _CST/P_LVL
+ * detection phase, to work cleanly with logical CPU hotplug.
+ */
+ if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
+ !pr->flags.has_cst && acpi_fadt.plvl2_up)
+ cx->type = ACPI_STATE_C1;
+#endif
/*
* Sleep:
* ------
@@ -527,6 +537,15 @@ static int acpi_processor_get_power_info
pr->power.states[ACPI_STATE_C0].valid = 1;
pr->power.states[ACPI_STATE_C1].valid = 1;
+#ifndef CONFIG_HOTPLUG_CPU
+ /*
+ * Check for P_LVL2_UP flag before entering C2 and above on
+ * an SMP system.
+ */
+ if ((num_online_cpus() > 1) && acpi_fadt.plvl2_up)
+ return_VALUE(-ENODEV);
+#endif
+
/* determine C2 and C3 address from pblk */
pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4;
pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5;
--
next prev parent reply other threads:[~2005-12-23 22:50 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20051223221200.342826000@press.kroah.org>
2005-12-23 22:47 ` [patch 00/19] -stable review for 2.6.14.5 Greg Kroah-Hartman
2005-12-23 22:47 ` Greg Kroah-Hartman [this message]
2005-12-24 15:38 ` [patch 01/19] ACPI: Add support for FADT P_LVL2_UP flag Pavel Machek
2005-12-24 16:14 ` Daniel Drake
2005-12-26 23:54 ` Greg KH
2005-12-23 22:47 ` [patch 02/19] ACPI: Prefer _CST over FADT for C-state capabilities Greg Kroah-Hartman
2005-12-23 22:47 ` [patch 03/19] [NETFILTER]: Fix CTA_PROTO_NUM attribute size in ctnetlink Greg Kroah-Hartman
2005-12-23 22:47 ` [patch 04/19] [NETFILTER]: Fix unbalanced read_unlock_bh " Greg Kroah-Hartman
2005-12-23 22:47 ` [patch 05/19] apci: fix NULL deref in video/lcd/brightness Greg Kroah-Hartman
2005-12-23 22:47 ` [patch 06/19] [PATCH] dpt_i2o fix for deadlock condition Greg Kroah-Hartman
2005-12-23 22:48 ` [patch 07/19] [GRE]: Fix hardware checksum modification Greg Kroah-Hartman
2005-12-23 22:48 ` [patch 08/19] [VLAN]: Fix hardware rx csum errors Greg Kroah-Hartman
2005-12-23 22:48 ` [patch 09/19] [NETFILTER]: Fix NAT init order Greg Kroah-Hartman
2005-12-23 22:48 ` [patch 10/19] [NETFILTER]: Fix incorrect dependency for IP6_NF_TARGET_NFQUEUE Greg Kroah-Hartman
2005-12-23 22:48 ` [patch 11/19] [RTNETLINK]: Fix RTNLGRP definitions in rtnetlink.h Greg Kroah-Hartman
2005-12-23 22:48 ` [patch 12/19] [BRIDGE-NF]: Fix bridge-nf ipv6 length check Greg Kroah-Hartman
2005-12-23 22:48 ` [patch 13/19] [IPV6]: Fix route lifetime Greg Kroah-Hartman
2005-12-23 22:48 ` [patch 14/19] [IPSEC]: Perform SA switchover immediately Greg Kroah-Hartman
2005-12-23 22:48 ` [patch 15/19] [PATCH] Input: fix an OOPS in HID driver Greg Kroah-Hartman
2005-12-23 22:48 ` [patch 16/19] kernel/params.c: fix sysfs access with CONFIG_MODULES=n Greg Kroah-Hartman
2005-12-23 22:48 ` [patch 17/19] SCSI: fix transfer direction in sd (kernel panic when ejecting iPod) Greg Kroah-Hartman
2005-12-23 22:48 ` [patch 18/19] SCSI: fix transfer direction in scsi_lib and st Greg Kroah-Hartman
2005-12-23 23:05 ` James Bottomley
2005-12-23 23:22 ` [stable] " Chris Wright
2005-12-23 22:48 ` [patch 19/19] setting ACLs on readonly mounted NFS filesystems (CVE-2005-3623) Greg Kroah-Hartman
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