fsync_buffers_list() and sync_dirty_buffer() both issue async writes and
then immediately wait on them. Conceptually, that makes them sync writes
and we should treat them as such so that the IO schedulers can handle
them appropriately.
This patch fixes a write starvation issue that Lin Ming reported, where
xx is stuck for more than 2 minutes because of a large number of
synchronous IO in the system:
Lin Ming confirms that this patch fixes the issue. I've run tests with
it for the past week and no ill effects have been observed, so I'm
proposing it for inclusion into 2.6.26.
Divyesh Shah [Mon, 16 Jun 2008 16:37:08 +0000 (18:37 +0200)]
block: Fix the starving writes bug in the anticipatory IO scheduler
AS scheduler alternates between issuing read and write batches. It does
the batch switch only after all requests from the previous batch are
completed.
When switching to a write batch, if there is an on-going read request,
it waits for its completion and indicates its intention of switching by
setting ad->changed_batch and the new direction but does not update the
batch_expire_time for the new write batch which it does in the case of
no previous pending requests.
On completion of the read request, it sees that we were waiting for the
switch and schedules work for kblockd right away and resets the
ad->changed_data flag.
Now when kblockd enters dispatch_request where it is expected to pick
up a write request, it in turn ends the write batch because the
batch_expire_timer was not updated and shows the expire timestamp for
the previous batch.
This results in the write starvation for all the cases where there is
the intention for switching to a write batch, but there is a previous
in-flight read request and the batch gets reverted to a read_batch
right away.
This also holds true in the reverse case (switching from a write batch
to a read batch with an in-flight write request).
I've checked that this bug exists on 2.6.11, 2.6.18, 2.6.24 and
linux-2.6-block git HEAD. I've tested the fix on x86 platforms with
SCSI drives where the driver asks for the next request while a current
request is in-flight.
This patch is based off linux-2.6-block git HEAD.
Bug reproduction:
A simple scenario which reproduces this bug is:
- dd if=/dev/hda3 of=/dev/null &
- lilo
The lilo takes forever to complete.
This can also be reproduced fairly easily with the earlier dd and
another test
program doing msync().
The example test program below should print out a message after every
iteration
but it simply hangs forever. With this bugfix it makes forward progress.
====
Example test program using msync() (thanks to suleiman AT google DOT
com)
* git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb: (42 commits)
V4L/DVB (8108): Fix open/close race in saa7134
V4L/DVB (8100): V4L/vivi: fix possible memory leak in vivi_fillbuff
V4L/DVB (8097): xc5000: check device hardware state to determine if firmware download is needed
V4L/DVB (8096): au8522: prevent false-positive lock status
V4L/DVB (8092): videodev: simplify and fix standard enumeration
V4L/DVB (8075): stv0299: Uncorrected block count and bit error rate fixed
V4L/DVB (8074): av7110: OSD transfers should not be interrupted
V4L/DVB (8073): av7110: Catch another type of ARM crash
V4L/DVB (8071): tda10023: Fix possible kernel oops during initialisation
V4L/DVB (8069): cx18: Fix S-Video and Compsite inputs for the Yuan MPC718 and enable card entry
V4L/DVB (8068): cx18: Add I2C slave reset via GPIO upon initialization
V4L/DVB (8067): cx18: Fix firmware load for case when digital capture happens first
V4L/DVB (8066): cx18: Fix audio mux input definitions for HVR-1600 Line In 2 and FM radio
V4L/DVB (8063): cx18: Fix unintended auto configurations in cx18-av-core
V4L/DVB (8061): cx18: only select tuner / frontend modules if !DVB_FE_CUSTOMISE
V4L/DVB (8048): saa7134: Fix entries for Avermedia A16d and Avermedia E506
V4L/DVB (8044): au8522: tuning optimizations
V4L/DVB (8043): au0828: add support for additional USB device id's
V4L/DVB (8042): DVB-USB UMT-010 channel scan oops
V4L/DVB (8040): soc-camera: remove soc_camera_host_class class
...
Linus Torvalds [Sun, 29 Jun 2008 19:22:30 +0000 (12:22 -0700)]
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6
* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6:
dock: bay: Don't call acpi_walk_namespace() when ACPI is disabled.
ACPI: don't walk tables if ACPI was disabled
thermal: Create CONFIG_THERMAL_HWMON=n
Removed vmlinux* rule because it matches too many useful files, replacing
it with rules matching filetype by filename (e.g. *.gz). Also unignored
.mailmap from the top directory. Added a comment telling the user how to
check for tracked files being ignored.
Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Sun, 29 Jun 2008 19:15:10 +0000 (12:15 -0700)]
Merge branch 'audit.b52' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current
* 'audit.b52' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current:
[PATCH] remove useless argument type in audit_filter_user()
[PATCH] audit: fix kernel-doc parameter notation
[PATCH] kernel/audit.c: nlh->nlmsg_type is gotten more than once
Richard Sharpe [Wed, 25 Jun 2008 02:11:13 +0000 (19:11 -0700)]
firewire: fw-sbp2: fix parsing of logical unit directories
There is a small off-by-one bug in firewire-sbp2. This causes problems
when a device exports multiple LUN Directories. I found it when trying
to talk to a SONY DVD Jukebox.
Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Acked-by: Kristian Høgsberg <krh@redhat.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (op. order, changelog)
Arjan van de Ven [Sun, 22 Jun 2008 20:03:02 +0000 (17:03 -0300)]
V4L/DVB (8108): Fix open/close race in saa7134
The saa7134 driver uses a (non-atomic) variable in an attempt to
only allow one opener of the device (how it deals with sending
the fd over unix sockets I don't know).
Unfortunately, the release function first decrements this variable,
and THEN goes on to disable more of the device. This allows for
a race where another opener of the device comes in after the decrement of
the variable, configures the hardware just to then see the hardware
be disabled by the rest of the release function.
This patch makes the release function use the same lock as the open
function to protect the hardware as well as the variable (which now
at least has some locking to protect it).
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Steven Toth [Sun, 22 Jun 2008 00:06:02 +0000 (21:06 -0300)]
V4L/DVB (8097): xc5000: check device hardware state to determine if firmware download is needed
This patch ensures that the xc5000 will have firmware loaded as needed if the
part is powered down or reset via gpio from the host. An example of this, in
some cases, could be after the system resumes from standby or hibernate modes.
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Hans Verkuil [Sat, 21 Jun 2008 16:23:27 +0000 (13:23 -0300)]
V4L/DVB (8092): videodev: simplify and fix standard enumeration
VIDIOC_ENUMSTD did not return all the PAL/SECAM/NTSC variants: it just returned
one single PAL/SECAM/NTSC standard without separate entries for the trickier
standards like NTSC-JP.
Changed the code so that it behaves better.
Also simplified the if/switch statements into a common standards lookup table.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Andy Walls [Sun, 22 Jun 2008 05:00:09 +0000 (02:00 -0300)]
V4L/DVB (8069): cx18: Fix S-Video and Compsite inputs for the Yuan MPC718 and enable card entry
cx18: Fix S-Video and Compsite input settings for the Yuan MPC718 per user
reports from Yuri Warczynski <Yuri.Warczynski@gmail.com> and
Brian Hope <brian@hopefamily.info> and enable the card entry. The tuner reset
GPIO pin is likely incorrect as the tuner firmware cannot be reloaded without a
reboot. It is likely the audio routing is done via GPIO which is not
implemented yet, as users report audio doesn't work for some inputs.
Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Andy Walls [Sun, 22 Jun 2008 04:27:00 +0000 (01:27 -0300)]
V4L/DVB (8068): cx18: Add I2C slave reset via GPIO upon initialization
cx18: Add I2C slave reset via GPIO upon initialization. One user,
Michael <msd4824@yahoo.com>, has reported this allows his HVR-1600 EEPROM to
be consistently recognized when using (long,) 100 msec delays. The delays in
this commit are nominal (10 & 40 msec) and need testing/tuning on boards with
I2C problems to find the right values.
Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Andy Walls [Sun, 22 Jun 2008 03:04:21 +0000 (00:04 -0300)]
V4L/DVB (8067): cx18: Fix firmware load for case when digital capture happens first
This is a fix for the case when a digital capture from dvr0 happens first after
modprobe, before access to any cx18 v4l2 device nodes. The initial dvb feed
start has been changed to load the firmware if not already loaded. Also fixed a
use counter to correct dvb feed accounting if starting the transport DMA fails.
Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Andy Walls [Fri, 20 Jun 2008 02:17:05 +0000 (23:17 -0300)]
V4L/DVB (8066): cx18: Fix audio mux input definitions for HVR-1600 Line In 2 and FM radio
Fix the cx18-cards.c structures for the HVR-1600 to reflect that audio Line In 2
and FM radio audio go to AIN3 and AIN4 of the CS5345 mux respectively. Verified
by physical inspection of an HVR-1600MCE, by listening to FM broadcasts with the
HVR-1600MCE, and by comparing with the card definition for a PVR-150 in ivtv.
Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Andy Walls [Sat, 14 Jun 2008 06:58:08 +0000 (03:58 -0300)]
V4L/DVB (8063): cx18: Fix unintended auto configurations in cx18-av-core
Change the cx18-av-core code so that accesses to cx23418 av core that
cause auto-configuration will be adjusted to emulate the auto-configuration
behavior of the cx25843. This fixes the VBI displayed as video at the top of
the frame for NTSC and probably other things.
Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
V4L/DVB (8040): soc-camera: remove soc_camera_host_class class
Devices can either be class devices or bus devices, not both at the
same time. Soc-camera host devices usually have a platform device as
their parent. Trying to also register them with a class crashes the
kernel, when linked statically. Interestingly, it works when built
as a module. Thanks to Paulius Zaleckas for reporting.
Michael Krufky [Mon, 9 Jun 2008 01:12:37 +0000 (22:12 -0300)]
V4L/DVB (8035): tda18271: dont touch EB14 if rf_cal lookup is out of range
The TDA18271HD/C1 rf_cal map lookup is expected to go out of range outside
of the frequency window 41 MHz - 61.1 MHz. In these cases, the internal
RF tracking filters calibration mechanism is used.
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Michael Krufky [Sun, 8 Jun 2008 23:10:29 +0000 (20:10 -0300)]
V4L/DVB (8034): tda18271: fix IF notch frequency handling
The IF notch bit gets unset when we update the Main Post Div register
value, before we have a chance to write the desired IF notch setting
to the tuner. Move the IF notch configuration to after we update MPD.
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
V4L/DVB (8029): Improve error message at tda1004x_attach
When an error occurs at firmware loading, sometimes, tda1004x stops answering.
Instead of reporting such error, attach code were assuming that the device were
answering an invalid ID (0xff). This can be seen when enabling debug options:
V4L/DVB (8028): Improve error messages for tda1004x attach
A fresh copy of v.29 firmware, using get_firmware, is leading to an invalid
firmware:
DVB: registering new adapter (saa7133[0])
DVB: registering frontend 0 (Philips TDA10046H DVB-T)...
tda1004x: setting up plls for 48MHz sampling clock
tda1004x: found firmware revision ff -- invalid
tda1004x: trying to boot from eeprom
tda1004x: found firmware revision ff -- invalid
tda1004x: waiting for firmware upload...
tda1004x: Error during firmware upload
tda1004x: found firmware revision ff -- invalid
tda1004x: firmware upload failed
Sometimes, loading/unloading this firmware makes tda1004x to return an invalid
ID. However, there were no printk messages to help to identify what were the
cause for the error.
With this patch, it will now print:
Invalid tda1004x ID = 0xff. Can't proceed
saa7133[0]/dvb: failed to attach tda10046
saa7133[0]/dvb: frontend initialization failed
Tested with LifeView FlyDVB-T Hybrid Cardbus/MSI TV @nywhere A/D NB
Marcin Slusarz [Tue, 10 Jun 2008 18:18:16 +0000 (15:18 -0300)]
V4L/DVB (8022): saa7134: fix race between opening and closing the device
decrementing dev->empress_users should be done as last action of ts_release,
because it sleeps and write access to dev->empress_started is not protected
in any way
(additionally closing thread could mute audio after opening thread unmuted it)
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
After this fix all of that commands works without problem:
v4l2-ctl --all -d /dev/video1
Driver Info:
Driver name : saa7134
Card type : Beholder BeholdTV M6 Extra
Bus info : PCI:0000:00:0d.0
Driver version: 526
Capabilities : 0x05000001
Video Capture
Read/Write
Streaming
Format Video Capture:
Width/Height : 720/576
Pixel Format : MPEG
Field : Any
Bytes per Line: 0
Size Image : 58656
Colorspace : Unknown (00000000)
Video input : 0 (CCIR656)
Video Standard = 0x000000ff
PAL-B/B1/G/H/I/D/D1/K
V4L/DVB (8017): Ensure em28xx extensions only get run against devs that support them
em28xx-audio.c
em28xx-dvb.c
- Em28xx extensions should ensure they are being only loaded against devices
that support them. Deals with case where there are multiple em28xx
devices, some of which have DVB (or ALSA) support and some do not.
em28xx-cards.c
- DVB support is supposed to be enabled for the first generation HVR-900.
This device was confirmed with DVB by mkrufky when we did the original work
in April, but I guess we forgot to set the flag.
V4L/DVB (8010): em28xx: Properly register extensions for already attached devices
em28xx-video.c
- Properly handle loading of the module when multiple devices are already
connected (such as at bootup). Before we were only calling dvb_init()
against the last device in the list, so while we were handling subsequent
adds properly, if there were multiple devices present on driver load,
everybody except the last device would not get initialized.
Hans Verkuil [Sun, 8 Jun 2008 09:05:18 +0000 (06:05 -0300)]
V4L/DVB (8008): cx18: remove duplicate audio and video input enums
cx18-cards.h had a copy of the audio and video input enums
from cx18-av-core.h, but with different prefixes. Removed
that copy and used the ones from cx18-av-core.h.
Thanks to Andy Walls <awalls@radix.net> for the report.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Rene Herman [Tue, 24 Jun 2008 17:38:56 +0000 (19:38 +0200)]
thermal: Create CONFIG_THERMAL_HWMON=n
A bug in libsensors <= 2.10.6 is exposed
when this new hwmon I/F is enabled.
Create CONFIG_THERMAL_HWMON=n
until some time after libsensors 2.10.7 ships
so those users can run the latest kernel.
libsensors 3.x is already fixed -- those users
can use CONFIG_THERMAL_HWMON=y now.
Signed-off-by: Rene Herman <rene.herman@gmail.com> Acked-by: Mark M. Hoffman <mhoffman@lightlink.com> Signed-off-by: Len Brown <len.brown@intel.com>
Bryan Wu [Wed, 25 Jun 2008 04:41:51 +0000 (12:41 +0800)]
Blackfin arch: fix up section mismatch warning
--
WARNING: vmlinux.o(.text+0x721a): Section mismatch in reference from the function ___fill_code_cplbtab() to the function .init.text:_fill_cplbtab()
The function ___fill_code_cplbtab() references
the function __init _fill_cplbtab().
This is often because ___fill_code_cplbtab lacks a __init
annotation or the annotation of _fill_cplbtab is wrong.
WARNING: vmlinux.o(.text+0x7238): Section mismatch in reference from the function ___fill_code_cplbtab() to the function .init.text:_fill_cplbtab()
The function ___fill_code_cplbtab() references
the function __init _fill_cplbtab().
This is often because ___fill_code_cplbtab lacks a __init
annotation or the annotation of _fill_cplbtab is wrong.
WARNING: vmlinux.o(.text+0x7250): Section mismatch in reference from the function ___fill_code_cplbtab() to the function .init.text:_fill_cplbtab()
The function ___fill_code_cplbtab() references
the function __init _fill_cplbtab().
This is often because ___fill_code_cplbtab lacks a __init
annotation or the annotation of _fill_cplbtab is wrong.
WARNING: vmlinux.o(.text+0x7264): Section mismatch in reference from the function ___fill_code_cplbtab() to the function .init.text:_fill_cplbtab()
The function ___fill_code_cplbtab() references
the function __init _fill_cplbtab().
This is often because ___fill_code_cplbtab lacks a __init
annotation or the annotation of _fill_cplbtab is wrong.
WARNING: vmlinux.o(.text+0x72a2): Section mismatch in reference from the function ___fill_data_cplbtab() to the function .init.text:_fill_cplbtab()
The function ___fill_data_cplbtab() references
the function __init _fill_cplbtab().
This is often because ___fill_data_cplbtab lacks a __init
annotation or the annotation of _fill_cplbtab is wrong.
WARNING: vmlinux.o(.text+0x72bc): Section mismatch in reference from the function ___fill_data_cplbtab() to the function .init.text:_fill_cplbtab()
The function ___fill_data_cplbtab() references
the function __init _fill_cplbtab().
This is often because ___fill_data_cplbtab lacks a __init
annotation or the annotation of _fill_cplbtab is wrong.
WARNING: vmlinux.o(.text+0x72d4): Section mismatch in reference from the function ___fill_data_cplbtab() to the function .init.text:_fill_cplbtab()
The function ___fill_data_cplbtab() references
the function __init _fill_cplbtab().
This is often because ___fill_data_cplbtab lacks a __init
annotation or the annotation of _fill_cplbtab is wrong.
WARNING: vmlinux.o(.text+0x72e8): Section mismatch in reference from the function ___fill_data_cplbtab() to the function .init.text:_fill_cplbtab()
The function ___fill_data_cplbtab() references
the function __init _fill_cplbtab().
This is often because ___fill_data_cplbtab lacks a __init
annotation or the annotation of _fill_cplbtab is wrong.
--
Sonic Zhang [Wed, 25 Jun 2008 04:02:07 +0000 (12:02 +0800)]
Blackfin arch: fix bug - kernel boot fails when Spinlock and rw-lock debugging enabled
Initialize the lock of bad_irq_desc properly.
The content of irq_desc array is replaced by bad_irq_desc in blackfin
arch irqchip init code. So, do it properly as common irq init code.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
Linus Torvalds [Wed, 25 Jun 2008 01:12:33 +0000 (18:12 -0700)]
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
[IA64] Eliminate NULL test after alloc_bootmem in iosapic_alloc_rte()
[IA64] Handle count==0 in sn2_ptc_proc_write()
[IA64] Fix boot failure on ia64/sn2
Linus Torvalds [Wed, 25 Jun 2008 01:09:06 +0000 (18:09 -0700)]
Merge branch 'kvm-updates-2.6.26' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm
* 'kvm-updates-2.6.26' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm:
KVM: Remove now unused structs from kvm_para.h
x86: KVM guest: Use the paravirt clocksource structs and functions
KVM: Make kvm host use the paravirt clocksource structs
x86: Make xen use the paravirt clocksource structs and functions
x86: Add structs and functions for paravirt clocksource
KVM: VMX: Fix host msr corruption with preemption enabled
KVM: ioapic: fix lost interrupt when changing a device's irq
KVM: MMU: Fix oops on guest userspace access to guest pagetable
KVM: MMU: large page update_pte issue with non-PAE 32-bit guests (resend)
KVM: MMU: Fix rmap_write_protect() hugepage iteration bug
KVM: close timer injection race window in __vcpu_run
KVM: Fix race between timer migration and vcpu migration
Jie Luo [Tue, 24 Jun 2008 17:38:31 +0000 (10:38 -0700)]
enable bus mastering on i915 at resume time
On 9xx chips, bus mastering needs to be enabled at resume time for much of the
chip to function. With this patch, vblank interrupts will work as expected
on resume, along with other chip functions. Fixes kernel bugzilla #10844.
Signed-off-by: Jie Luo <clotho67@gmail.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Gerd Hoffmann [Tue, 3 Jun 2008 14:17:32 +0000 (16:17 +0200)]
x86: KVM guest: Use the paravirt clocksource structs and functions
This patch updates the kvm host code to use the pvclock structs
and functions, thereby making it compatible with Xen.
The patch also fixes an initialization bug: on SMP systems the
per-cpu has two different locations early at boot and after CPU
bringup. kvmclock must take that in account when registering the
physical address within the host.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Gerd Hoffmann [Tue, 3 Jun 2008 14:17:29 +0000 (16:17 +0200)]
x86: Add structs and functions for paravirt clocksource
This patch adds structs for the paravirt clocksource ABI
used by both xen and kvm (pvclock-abi.h).
It also adds some helper functions to read system time and
wall clock time from a paravirtual clocksource (pvclock.[ch]).
They are based on the xen code. They are enabled using
CONFIG_PARAVIRT_CLOCK.
Subsequent patches of this series will put the code in use.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
This patch changes the computation for zero_metapath_length(), which it
renames to metapath_branch_start(). When you are extending the metadata
tree, The indirect blocks that point to the new data block must either
diverge from the existing tree either at the inode, or at the first
indirect block. They can diverge at the first indirect block because the
inode has room for 483 pointers while the indirect blocks have room for
509 pointers, so when the tree is grown, there is some free space in the
first indirect block. What metapath_branch_start() now computes is the
height where the first indirect block for the new data block is located.
It can either be 1 (if the indirect block diverges from the inode) or 2
(if it diverges from the first indirect block).
Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Julia Lawall [Tue, 24 Jun 2008 08:22:05 +0000 (10:22 +0200)]
[IA64] Eliminate NULL test after alloc_bootmem in iosapic_alloc_rte()
As noted by Akinobu Mita alloc_bootmem and related functions never return
NULL and always return a zeroed region of memory. Thus a NULL test or
memset after calls to these functions is unnecessary.
Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Tony Luck <tony.luck@intel.com>
Cliff Wickman [Tue, 24 Jun 2008 17:20:06 +0000 (10:20 -0700)]
[IA64] Handle count==0 in sn2_ptc_proc_write()
The fix applied in e0c6d97c65e0784aade7e97b9411f245a6c543e7
"security hole in sn2_ptc_proc_write" didn't take into account
the case where count==0 (which results in a buffer underrun
when adding the trailing '\0'). Thanks to Andi Kleen for
pointing this out.
Signed-off-by: Cliff Wickman <cpw@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Non-PAE operation has been deprecated in Xen for a while, and is
rarely tested or used. xen-unstable has now officially dropped
non-PAE support. Since Xen/pvops' non-PAE support has also been
broken for a while, we may as well completely drop it altogether.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Tomas Janousek [Mon, 23 Jun 2008 13:12:35 +0000 (15:12 +0200)]
udf: Fix regression in UDF anchor block detection
In some cases it could happen that some block passed test in
udf_check_anchor_block() even though udf_read_tagged() refused to read it later
(e.g. because checksum was not correct). This patch makes
udf_check_anchor_block() use udf_read_tagged() so that the checking is
stricter.
Avi Kivity [Tue, 24 Jun 2008 08:48:49 +0000 (11:48 +0300)]
KVM: VMX: Fix host msr corruption with preemption enabled
Switching msrs can occur either synchronously as a result of calls to
the msr management functions (usually in response to the guest touching
virtualized msrs), or asynchronously when preempting a kvm thread that has
guest state loaded. If we're unlucky enough to have the two at the same
time, host msrs are corrupted and the machine goes kaput on the next syscall.
Most easily triggered by Windows Server 2008, as it does a lot of msr
switching during bootup.
Avi Kivity [Tue, 17 Jun 2008 22:36:36 +0000 (15:36 -0700)]
KVM: ioapic: fix lost interrupt when changing a device's irq
The ioapic acknowledge path translates interrupt vectors to irqs. It
currently uses a first match algorithm, stopping when it finds the first
redirection table entry containing the vector. That fails however if the
guest changes the irq to a different line, leaving the old redirection table
entry in place (though masked). Result is interrupts not making it to the
guest.
Fix by always scanning the entire redirection table.
Avi Kivity [Thu, 12 Jun 2008 13:54:41 +0000 (16:54 +0300)]
KVM: MMU: Fix oops on guest userspace access to guest pagetable
KVM has a heuristic to unshadow guest pagetables when userspace accesses
them, on the assumption that most guests do not allow userspace to access
pagetables directly. Unfortunately, in addition to unshadowing the pagetables,
it also oopses.
This never triggers on ordinary guests since sane OSes will clear the
pagetables before assigning them to userspace, which will trigger the flood
heuristic, unshadowing the pagetables before the first userspace access. One
particular guest, though (Xenner) will run the kernel in userspace, triggering
the oops. Since the heuristic is incorrect in this case, we can simply
remove it.
Marcelo Tosatti [Wed, 11 Jun 2008 23:32:40 +0000 (20:32 -0300)]
KVM: MMU: large page update_pte issue with non-PAE 32-bit guests (resend)
kvm_mmu_pte_write() does not handle 32-bit non-PAE large page backed
guests properly. It will instantiate two 2MB sptes pointing to the same
physical 2MB page when a guest large pte update is trapped.
Instead of duplicating code to handle this, disallow directory level
updates to happen through kvm_mmu_pte_write(), so the two 2MB sptes
emulating one guest 4MB pte can be correctly created by the page fault
handling path.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
rmap_next() does not work correctly after rmap_remove(), as it expects
the rmap chains not to change during iteration. Fix (for now) by restarting
iteration from the beginning.
Marcelo Tosatti [Fri, 6 Jun 2008 19:37:36 +0000 (16:37 -0300)]
KVM: close timer injection race window in __vcpu_run
If a timer fires after kvm_inject_pending_timer_irqs() but before
local_irq_disable() the code will enter guest mode and only inject such
timer interrupt the next time an unrelated event causes an exit.
It would be simpler if the timer->pending irq conversion could be done
with IRQ's disabled, so that the above problem cannot happen.
For now introduce a new vcpu requests bit to cancel guest entry.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Marcelo Tosatti [Fri, 6 Jun 2008 19:37:35 +0000 (16:37 -0300)]
KVM: Fix race between timer migration and vcpu migration
A guest vcpu instance can be scheduled to a different physical CPU
between the test for KVM_REQ_MIGRATE_TIMER and local_irq_disable().
If that happens, the timer will only be migrated to the current pCPU on
the next exit, meaning that guest LAPIC timer event can be delayed until
a host interrupt is triggered.
Fix it by cancelling guest entry if any vcpu request is pending. This
has the side effect of nicely consolidating vcpu->requests checks.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Linus Torvalds [Mon, 23 Jun 2008 23:25:11 +0000 (16:25 -0700)]
Merge branch 'hotfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
* 'hotfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
NFS: nfs_updatepage(): don't mark page as dirty if an error occurred
NFS: Fix filehandle size comparisons in the mount code
NFS: Reduce the NFS mount code stack usage.
projects / linux-2.6 / log