From: Greg KH <gregkh@suse.de>
To: linux-kernel@vger.kernel.org, stable@kernel.org
Cc: stable-review@kernel.org, torvalds@linux-foundation.org,
akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk,
Suresh Siddha <suresh.b.siddha@intel.com>,
Chris McDermott <lcm@linux.vnet.ibm.com>,
Yinghai Lu <yinghai@kernel.org>
Subject: [10/30] x86, apic: use physical mode for IBM summit platforms
Date: Wed, 20 Jan 2010 20:15:31 -0800 [thread overview]
Message-ID: <20100121041833.780502526@mini.kroah.org> (raw)
In-Reply-To: <20100121041852.GA9656@kroah.com>
2.6.32-stable review patch. If anyone has any objections, please let us know.
------------------
From: Suresh Siddha <suresh.b.siddha@intel.com>
commit dfea91d5a7c795fd6f4e1a97489a98e4e767463e upstream.
Chris McDermott from IBM confirmed that hurricane chipset in IBM summit
platforms doesn't support logical flat mode. Irrespective of the other
things like apic_id's, total number of logical cpu's, Linux kernel
should default to physical mode for this system.
The 32-bit kernel does so using the OEM checks for the IBM summit
platform. Add a similar OEM platform check for the 64bit kernel too.
Otherwise the linux kernel boot can hang on this platform under certain
bios/platform settings.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Tested-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Chris McDermott <lcm@linux.vnet.ibm.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
arch/x86/kernel/apic/apic_flat_64.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/arch/x86/kernel/apic/apic_flat_64.c
+++ b/arch/x86/kernel/apic/apic_flat_64.c
@@ -240,6 +240,11 @@ static int physflat_acpi_madt_oem_check(
printk(KERN_DEBUG "system APIC only can use physical flat");
return 1;
}
+
+ if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
+ printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
+ return 1;
+ }
#endif
return 0;
next prev parent reply other threads:[~2010-01-21 4:28 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-21 4:18 [00/30] 2.6.32.5 review Greg KH
2010-01-21 4:15 ` [01/30] inotify: do not reuse watch descriptors Greg KH
2010-01-21 4:15 ` [02/30] inotify: only warn once for inotify problems Greg KH
2010-01-21 4:15 ` [03/30] revert "drivers/video/s3c-fb.c: fix clock setting for Samsung SoC Framebuffer" Greg KH
2010-01-21 4:15 ` [04/30] memcg: ensure list is empty at rmdir Greg KH
2010-01-21 4:15 ` [05/30] drm/i915: remove loop in Ironlake interrupt handler Greg KH
2010-01-21 4:15 ` [06/30] block: Fix incorrect reporting of partition alignment Greg KH
2010-01-21 4:15 ` [07/30] x86, mce: Thermal monitoring depends on APIC being enabled Greg KH
2010-01-21 4:15 ` [08/30] futexes: Remove rw parameter from get_futex_key() Greg KH
2010-01-21 4:15 ` [09/30] page allocator: update NR_FREE_PAGES only when necessary Greg KH
2010-01-21 4:15 ` Greg KH [this message]
2010-01-21 4:15 ` [11/30] edac: i5000_edac critical fix panic out of bounds Greg KH
2010-01-21 4:15 ` [12/30] x86: SGI UV: Fix mapping of MMIO registers Greg KH
2010-01-21 4:15 ` [13/30] mfd: WM835x GPIO direction register is not locked Greg KH
2010-01-21 4:15 ` [14/30] mfd: Correct WM835x ISINK ramp time defines Greg KH
2010-01-21 4:15 ` [15/30] ALSA: hda - Fix missing capture mixer for ALC861/660 codecs Greg KH
2010-01-21 4:15 ` [16/30] V4L/DVB (13868): gspca - sn9c20x: Fix test of unsigned Greg KH
2010-01-21 4:15 ` [17/30] reiserfs: truncate blocks not used by a write Greg KH
2010-01-21 4:15 ` [18/30] HID: add device IDs for new model of Apple Wireless Keyboard Greg KH
2010-01-21 4:15 ` [19/30] PCI/cardbus: Add a fixup hook and fix powerpc Greg KH
2010-01-21 4:15 ` [20/30] [SCSI] megaraid_sas: remove sysfs poll_mode_io world writeable permissions Greg KH
2010-01-21 4:15 ` [21/30] Input: pmouse - move Sentelic probe down the list Greg KH
2010-01-21 4:15 ` [22/30] asus-laptop: add Lenovo SL hotkey support Greg KH
2010-01-21 4:15 ` [23/30] sched: Fix cpu_clock() in NMIs, on !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK Greg KH
2010-01-21 4:15 ` [24/30] sparc64: Fix NMI programming when perf events are active Greg KH
2010-01-21 4:15 ` [25/30] sparc64: Fix Niagara2 perf event handling Greg KH
2010-01-21 4:15 ` [26/30] i2c: Do not use device name after device_unregister Greg KH
2010-01-21 4:15 ` [27/30] i2c/pca: Dont use *_interruptible Greg KH
2010-01-21 4:15 ` [28/30] serial/8250_pnp: add a new Fujitsu Wacom Tablet PC device Greg KH
2010-01-21 4:15 ` [29/30] sched: Fix task priority bug Greg KH
2010-01-21 4:15 ` [30/30] vfs: Fix vmtruncate() regression Greg KH
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