14 Jan, 2011
24 commits
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Fix unusued return value compiler warnings due to unchecked write() calls.
[akpm@linux-foundation.org: correctly handle short writes]
Signed-off-by: Chris Ruffin
Cc: Mark Brown
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The readmostly section should end at a cacheline aligned address,
otherwise the last several data might share cachline with other data and
make the readmostly data still have cache bounce.For example, in ia64, secpath_cachep is the last readmostly data, and it
shares cacheline with init_uts_ns.a000000100e80480 d secpath_cachep
a000000100e80488 D init_uts_nsSigned-off-by: Shaohua Li
Cc: "H. Peter Anvin"
Cc: Eric Dumazet
Acked-by: Tejun Heo
Cc: Ingo Molnar
Cc: Thomas Gleixner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Cc: Will Newton
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Currently, tosh_smm() prototype is present in a header file exported to
userland. This patch fixes it.Signed-off-by: Alexander Shishkin
Cc: Jonathan Buzzard
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Michal reports:
In the framebuffer subsystem the abs() macro is often used as a part of
the calculation of a Manhattan metric, which in turn is used as a measure
of similarity between video modes. The arguments of abs() are sometimes
unsigned numbers. This worked fine until commit a49c59c0 ("Make sure the
value in abs() does not get truncated if it is greater than 2^32:) , which
changed the definition of abs() to prevent truncation. As a result of
this change, in the following piece of code:u32 a = 0, b = 1;
u32 c = abs(a - b);'c' will end up with a value of 0xffffffff instead of the expected 0x1.
A problem caused by this change and visible by the end user is that
framebuffer drivers relying on functions from modedb.c will fail to find
high resolution video modes similar to that explicitly requested by the
user if an exact match cannot be found (see e.g.Fix this by special-casing `long' types within abs().
This patch reduces x86_64 code size a bit - drivers/video/uvesafb.o shrunk
by 15 bytes, presumably because it is doing abs() on 4-byte quantities,
and expanding those to 8-byte longs adds code.testcase:
#define oldabs(x) ({ \
long __x = (x); \
(__x < 0) ? -__x : __x; \
})#define newabs(x) ({ \
long ret; \
if (sizeof(x) == sizeof(long)) { \
long __x = (x); \
ret = (__x < 0) ? -__x : __x; \
} else { \
int __x = (x); \
ret = (__x < 0) ? -__x : __x; \
} \
ret; \
})typedef unsigned int u32;
main()
{
u32 a = 0;
u32 b = 1;
u32 oldc = oldabs(a - b);
u32 newc = newabs(a - b);printf("%u %u\n", oldc, newc);
}akpm:/home/akpm> gcc t.c
akpm:/home/akpm> ./a.out
4294967295 1Reported-by: Michal Januszewski
Cc: Rolf Eike Beer
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Occasionally the system gets into a state where the CMOS clock has gotten
slightly ahead of current time and the periodic update of RTC fails. The
message is a nuisance and repeats spamming the log.See: http://www.ntp.org/ntpfaq/NTP-s-trbl-spec.htm#Q-LINUX-SET-RTC-MMSS
Rather than just removing the message, make it show only once and reduce
severity since it indicates a normal and non urgent condition.Signed-off-by: Stephen Hemminger
Cc: Richard Henderson
Cc: Ivan Kokshaysky
Cc: Matt Turner
Cc: Ralf Baechle
Cc: David Howells
Cc: Paul Mundt
Cc: Ingo Molnar
Cc: "H. Peter Anvin"
Cc: Thomas Gleixner
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
We need to know the reason why system rebooted in support service.
However, we can't inform our customers of the reason because final
messages are lost on current Linux kernel.This patch improves the situation above because the final messages are
saved by adding kmsg_dump() to reboot, halt, poweroff and
emergency_restart path.Signed-off-by: Seiji Aguchi
Cc: David Woodhouse
Cc: Marco Stornelli
Reviewed-by: Artem Bityutskiy
Reviewed-by: KOSAKI Motohiro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This series aims to develop logging facility for enterprise use.
It is important to save kernel messages reliably on enterprise system
because they are helpful for diagnosing system.This series add kmsg_dump() to the paths loosing kernel messages. The use
case is the following.[Use case of reboot/poweroff/halt/emergency_restart]
My company has often experienced the followings in our support service.
- Customer's system suddenly reboots.
- Customers ask us to investigate the reason of the reboot.We recognize the fact itself because boot messages remain in
/var/log/messages. However, we can't investigate the reason why the
system rebooted, because the last messages don't remain. And off course
we can't explain the reason.We can solve above problem with this patch as follows.
Case1: reboot with command
- We can see "Restarting system with command:" or ""Restarting system.".Case2: halt with command
- We can see "System halted.".Case3: poweroff with command
- We can see " Power down.".Case4: emergency_restart with sysrq.
- We can see "Sysrq:" outputted in __handle_sysrq().Case5: emergency_restart with softdog.
- We can see "Initiating system reboot" in watchdog_fire().So, we can distinguish the reason of reboot, poweroff, halt and emergency_restart.
If customer executed reboot command, you may think the customer should
know the fact. However, they often claim they don't execute the command
when they rebooted system by mistake.No message remains on the current Linux kernel, so we can't show the proof
to the customer. This patch improves this situation.This patch:
Alters mtdoops and ramoops to perform their actions only for
KMSG_DUMP_PANIC, KMSG_DUMP_OOPS and KMSG_DUMP_KEXEC because they would
like to log crashes only.Signed-off-by: Seiji Aguchi
Cc: David Woodhouse
Cc: Marco Stornelli
Reviewed-by: Artem Bityutskiy
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Simplify write file operation for mmapper by using
simple_write_to_buffer().Signed-off-by: Akinobu Mita
Cc: Jeff Dike
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add missing MODULE_LICENSE():
WARNING: modpost: missing MODULE_LICENSE() in arch/um/drivers/mmapper_kern.o
Signed-off-by: Randy Dunlap
Cc: Greg Lonnon
Cc: Jeff Dike
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
unregister_winch() should use list_for_each_safe(), as it can delete from
the list.Signed-off-by: Will Newton
Cc: richard -rw- weinberger
Acked-by: WANG Cong
Cc: Jeff Dike
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Currently CONFIG_HIGHMEM is broken on User Mode Linux. I'm not sure if it
worked ever.It doesn't compile and this breaks randomconfig testing.
Signed-off-by: Richard Weinberger
Cc: Jeff Dike
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The reset command is part of the init sequence and it take effect
only if the lcd is powered.The effect of the bug was that the sequence:
set lcd power_state to FB_BLANK_POWERDOWN
set lcd power_state to FB_BLANK_UNBLANK
Did not produced a complete reboot of the LCD which was showing fuzzy
colours.This was not experienced before implementing correctly all the LCD power
states with the patch [1]. Since before the patch [1] the regulators were
not touched and the LCD shutdown was reached with a register write. After
the patch [1] a complete boot sequence with an initial reset is needed for
the display every time the LCD is powered up.drivers-video-backlight-l4f00242t03c-full-implement-fb-power-states-for-this-lcd.patch
Signed-off-by: Alberto Panizzo
Cc: Richard Purdie
Cc: Marek Vasut
Cc: Tejun Heo
Cc: Axel Lin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Otherwise a double call to:
$ echo 4 > /sys/class/lcd/l4f00242t03/lcd_power
Will, the first power down the lcd and regulators correctly and the
second produce an unbalanced call to regulator disable.Signed-off-by: Alberto Panizzo
Cc: Richard Purdie
Cc: Marek Vasut
Cc: Tejun Heo
Cc: Axel Lin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Complete the support of fb power states managing correctly the regulators
bound to this driver.Signed-off-by: Alberto Panizzo
Cc: Richard Purdie
Cc: Marek Vasut
Cc: Tejun Heo
Cc: Axel Lin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Fixes sparse warning:
drivers/video/backlight/l4f00242t03.c:28:21: error: dubious one-bit signed bitfieldSigned-off-by: Mariusz Kozlowski
Acked-by: Richard Purdie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Extend the LED backlight tirgger driver with an option that allows for
inverting the trigger output polarity.With the invertion option provided, I (ab)use the backlight trigger for
driving a LED that indicates LCD display blank condtition on my Amstrad
Delta videophone. Since the machine has no dedicated power LED, it was
not possible to distinguish if the display was blanked, or the machine was
turned off, without touching it.The invert sysfs control is patterned after a similiar function of the GPIO
trigger driver.[akpm@linux-foundation.org: make output match input, tighten input checking]
[akpm@linux-foundation.org: make output match input, tighten input checking]
Signed-off-by: Janusz Krzysztofik
Cc: Paul Mundt
Acked-by: Richard Purdie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Currently the led device name is fetched from the device_type in
I2C_BOARD_INFO which comes from the platform data. This name is in turn
used to create an entry in sysfs.If there exists two or more lp5521 on a particular platform, the
device_type in I2C_BOARD_INFO has to be the same, else lp5521 driver probe
wont be called and if used so, results in run time warning "cannot create
sysfs with same name" and hence a failure.The name that is used to create sysfs entry is to be passed by the struct
led_platform_data. Hence adding an element of type const char * and
change in lp5521 driver to use this name in creating the led device if
present else use the name obtained by I2C_BOARD_INFO.Signed-off-by: Arun Murthy
Acked-by: Samu Onkalo
Cc: Ilkka Koskinen
Cc: Richard Purdie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Driver contained possibility for circular locking.
One lock is held by sysfs-core and another one by the driver itself. This
happened when the driver created or removed sysfs entries dynamically.
There is no real need to do those operations. Now all the sysfs entries
are created at probe and removed at removal. Engine load sysfs entries
are now visible all the time. However, access to the entries fails if the
engine is disabled or running.Signed-off-by: Samu Onkalo
Cc: Arun Murthy
Reviewed-by: Ilkka Koskinen
Cc: Richard Purdie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Driver contained possibility for circular locking.
One lock is held by sysfs-core and another one by the driver itself. This
happened when the driver created or removed sysfs entries dynamically.
There is no real need to do those operations. Now all the sysfs entries
are created at probe and removed at removal. Engine load and mux
configuration sysfs entries are now visible all the time. However, access
to the entries fails if the engine is disabled or running.Signed-off-by: Samu Onkalo
Cc: Arun Murthy
Reviewed-by: Ilkka Koskinen
Cc: Richard Purdie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Currently all leds channels begins with string lp5523. Patch adds a
possibility to provide name via platform data. This makes it possible to
have several chips without overlapping sysfs names.Signed-off-by: Samu Onkalo
Cc: Arun Murthy
Cc: Ilkka Koskinen
Cc: Richard Purdie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
- Remove unneeded input_free_device() after input_unregister_device().
- Add pca9532_destroy_devices() function for destroy devices.
Signed-off-by: Axel Lin
Acked-by: Dmitry Torokhov
Cc: Richard Purdie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The code doesn't check first sscanf() return value. If first sscanf()
failed then c contains some garbage. It might lead to reading
uninitialised stack data in the second sscanf() call.Signed-off-by: Vasiliy Kulikov
Cc: Richard Purdie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
pr_warning_ratelimited() doesn't exist.
Also include printk.h, which defines these things.
Cc: Theodore Ts'o
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
13 Jan, 2011
5 commits
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* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6: (39 commits)
i915/gtt: fix ordering causing DMAR errors on object teardown.
i915/gtt: fix ordering issues with status setup and DMAR
drm/i915/execbuffer: Reorder binding of objects to favour restrictions
drm/i915: If we hit OOM when allocating GTT pages, clear the aperture
drm/i915/evict: Ensure we completely cleanup on failure
drm/i915/execbuffer: Correctly clear the current object list upon EFAULT
drm/i915/debugfs: Show all objects in the gtt
drm/i915: Record AGP memory type upon error
drm/i915: Periodically flush the active lists and requests
drm/i915/gtt: Unmap the PCI pages after unbinding them from the GTT
drm/i915: Record the error batchbuffer on each ring
drm/i915: Include TLB miss overhead for computing WM
drm/i915: Propagate error from flushing the ring
drm/i915: detect & report PCH display error interrupts
drm/i915: cleanup rc6 code
drm/i915: fix rc6 enabling around suspend/resume
drm/i915: re-enable rc6 support for Ironlake+
drm/i915: Make the ring IMR handling private
drm/i915/ringbuffer: Simplify the ring irq refcounting
drm/i915/debugfs: Show the per-ring IMR
... -
* 'tools' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6:
tools: create power/x86/x86_energy_perf_policy
tools: create power/x86/turbostat -
* git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-ktest: (30 commits)
ktest: Ask for the manditory config options instead of just failing
ktest: Copy the last good and bad configs in config_bisect
ktest: For grub reboot, use run_ssh instead of run_command
ktest: Added force stop after success and failure
ktest: Parse off the directory name in useconfig for failures
ktest: Use different temp config name for minconfig
ktest: Updated the sample.conf for the latest options
ktest: Added compare script to test ktest.pl to sample.conf
ktest: Added config_bisect test type
ktest/cleanups: Added version 0.2, ssh as options
ktest: Output something easy to parse for failure or success
ktest: Allow a test case to undefine a default value
ktest: Use $output_config instead of typing $outputdir/.config
ktest: Write to stdout if no log file is given
ktest: Use oldnoconfig instead of yes command
ktest: Update the sample config file with more documentation
ktest: New TEST_START instead of using [], and use real SHA1s
ktest: Add poweroff after halt and powercycle after reboot
ktest: Add POST_INSTALL to allow initrds to be created
ktest: Added sample.conf, new %default option format
... -
* 'stable/xenbus' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen/xenbus: making backend support modular is too complex
xen/pci: Make xen-pcifront be dependent on XEN_XENBUS_FRONTEND
xen/xenbus: fixup checkpatch issues in xenbus_probe*
xen/netfront: select XEN_XENBUS_FRONTEND
xen/xenbus: clean up noise in xenbus_probe_frontend.c
xen/xenbus: clean up noise in xenbus_probe_backend.c
xen/xenbus: clean up noise in xenbus_probe.c
xen/xenbus: cleanup debug noise in xenbus_comms.c
xen/xenbus: clean up error handling
xen/xenbus: make frontend bus GPL
xen/xenbus: make sure backend bus is registered earlier
xenbus/frontend: register bus earlier
xen: remove xen/evtchn.h
xen: add backend driver support
xen: separate out frontend xenbus -
Fix writev() to not keep writing the first segment over and over again
instead of moving onto subsequent segments and update the NTFS entry in
MAINTAINERS to reflect that Tuxera Inc. now supports the NTFS driver.Signed-off-by: Anton Altaparmakov
Signed-off-by: Linus Torvalds
12 Jan, 2011
11 commits
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MSR_IA32_ENERGY_PERF_BIAS first became available on Westmere Xeon.
It is implemented in all Sandy Bridge processors -- mobile, desktop and server.
It is expected to become increasingly important in subsequent generations.x86_energy_perf_policy is a user-space utility to set the
hardware energy vs performance policy hint in the processor.
Most systems would benefit from "x86_energy_perf_policy normal"
at system startup, as the hardware default is maximum performance
at the expense of energy efficiency.See x86_energy_perf_policy.8 man page for more information.
Background:
Linux-2.6.36 added "epb" to /proc/cpuinfo to indicate
if an x86 processor supports MSR_IA32_ENERGY_PERF_BIAS,
without actually modifying the MSR.In March, 2010, Venkatesh Pallipadi proposed a small driver
that programmed MSR_IA32_ENERGY_PERF_BIAS, based on
the cpufreq governor in use. It also offered
a boot-time cmdline option to override.
http://lkml.org/lkml/2010/3/4/457
But hiding the hardware policy behind the
governor choice was deemed "kinda icky".In June, 2010, I proposed a generic user/kernel API to
generalize the power/performance policy trade-off.
"RFC: /sys/power/policy_preference"
http://lkml.org/lkml/2010/6/16/399
That is my preference for implementing this capability,
but I received no support on the list.So in September, 2010, I sent x86_energy_perf_policy.c to LKML,
a user-space utility that scribbles directly to the MSR.
http://lkml.org/lkml/2010/9/28/246Here is that same utility, after responding to some review feedback,
to live in tools/power/, where it is easily found.Signed-off-by: Len Brown
-
turbostat is a Linux tool to observe proper operation
of Intel(R) Turbo Boost Technology.turbostat displays the actual processor frequency
on x86 processors that include APERF and MPERF MSRs.Note that turbostat is of limited utility on Linux
kernels 2.6.29 and older, as acpi_cpufreq cleared
APERF/MPERF up through that release.On Intel Core i3/i5/i7 (Nehalem) and newer processors,
turbostat also displays residency in idle power saving states,
which are necessary for diagnosing any cpuidle issues
that may have an effect on turbo-mode.See the turbostat.8 man page for example usage.
Signed-off-by: Len Brown
-
Previous to the last GTT rework we always rewrote the GTT then unmapped the
object, somehow this got reversed in the rework in 2.6.37-rc5 timeframe.This fix needs to go to stable in an alternate form since the code changed.
This fixes DMAR reports on my Ironlake HP2540p.
Signed-off-by: Dave Airlie
-
This code was setting up the status page before setting the DMAR-is-on-bit,
so we were getting DMAR errors on the status page. Reverse the two bits
of init code to the correct result.Signed-off-by: Dave Airlie
-
* 'drm-intel-fixes' of ssh://master.kernel.org/pub/scm/linux/kernel/git/ickle/drm-intel: (37 commits)
drm/i915/execbuffer: Reorder binding of objects to favour restrictions
drm/i915: If we hit OOM when allocating GTT pages, clear the aperture
drm/i915/evict: Ensure we completely cleanup on failure
drm/i915/execbuffer: Correctly clear the current object list upon EFAULT
drm/i915/debugfs: Show all objects in the gtt
drm/i915: Record AGP memory type upon error
drm/i915: Periodically flush the active lists and requests
drm/i915/gtt: Unmap the PCI pages after unbinding them from the GTT
drm/i915: Record the error batchbuffer on each ring
drm/i915: Include TLB miss overhead for computing WM
drm/i915: Propagate error from flushing the ring
drm/i915: detect & report PCH display error interrupts
drm/i915: cleanup rc6 code
drm/i915: fix rc6 enabling around suspend/resume
drm/i915: re-enable rc6 support for Ironlake+
drm/i915: Make the ring IMR handling private
drm/i915/ringbuffer: Simplify the ring irq refcounting
drm/i915/debugfs: Show the per-ring IMR
drm/i915: Mask USER interrupts on gen6 (until required)
drm/i915: Handle ringbuffer stalls when flushing
... -
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (67 commits)
cxgb4vf: recover from failure in cxgb4vf_open()
netfilter: ebtables: make broute table work again
netfilter: fix race in conntrack between dump_table and destroy
ah: reload pointers to skb data after calling skb_cow_data()
ah: update maximum truncated ICV length
xfrm: check trunc_len in XFRMA_ALG_AUTH_TRUNC
ehea: Increase the skb array usage
net/fec: remove config FEC2 as it's used nowhere
pcnet_cs: add new_id
tcp: disallow bind() to reuse addr/port
net/r8169: Update the function of parsing firmware
net: ppp: use {get,put}_unaligned_be{16,32}
CAIF: Fix IPv6 support in receive path for GPRS/3G
arp: allow to invalidate specific ARP entries
net_sched: factorize qdisc stats handling
mlx4: Call alloc_etherdev to allocate RX and TX queues
net: Add alloc_netdev_mqs function
caif: don't set connection request param size before copying data
cxgb4vf: fix mailbox data/control coherency domain race
qlcnic: change module parameter permissions
... -
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
sparc64: Fix bootup regression due to perf init ordering. -
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (72 commits)
powerpc/pseries: Fix build of topology stuff without CONFIG_NUMA
powerpc/pseries: Fix VPHN build errors on non-SMP systems
powerpc/83xx: add mpc8308_p1m DMA controller device-tree node
powerpc/83xx: add DMA controller to mpc8308 device-tree node
powerpc/512x: try to free dma descriptors in case of allocation failure
powerpc/512x: add MPC8308 dma support
powerpc/512x: fix the hanged dma transfer issue
powerpc/512x: scatter/gather dma fix
powerpc/powermac: Make auto-loading of therm_pm72 possible
of/address: Use propper endianess in get_flags
powerpc/pci: Use printf extension %pR for struct resource
powerpc: Remove unnecessary casts of void ptr
powerpc: Disable VPHN polling during a suspend operation
powerpc/pseries: Poll VPA for topology changes and update NUMA maps
powerpc: iommu: Add device name to iommu error printks
powerpc: Record vma->phys_addr in ioremap()
powerpc: Update compat_arch_ptrace
powerpc: Fix PPC_PTRACE_SETHWDEBUG on PPC_BOOK3S
powerpc/time: printk time stamp init not correct
powerpc: Minor cleanups for machdep.h
... -
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband: (42 commits)
IB/qib: Fix refcount leak in lkey/rkey validation
IB/qib: Improve SERDES tunning on QMH boards
IB/qib: Unnecessary delayed completions on RC connection
IB/qib: Issue pre-emptive NAKs on eager buffer overflow
IB/qib: RDMA lkey/rkey validation is inefficient for large MRs
IB/qib: Change QPN increment
IB/qib: Add fix missing from earlier patch
IB/qib: Change receive queue/QPN selection
IB/qib: Fix interrupt mitigation
IB/qib: Avoid duplicate writes to the rcv head register
IB/qib: Add a few new SERDES tunings
IB/qib: Reset packet list after freeing
IB/qib: New SERDES init routine and improvements to SI quality
IB/qib: Clear WAIT_SEND flags when setting QP to error state
IB/qib: Fix context allocation with multiple HCAs
IB/qib: Fix multi-Florida HCA host panic on reboot
IB/qib: Handle transitions from ACTIVE_DEFERRED to ACTIVE better
IB/qib: UD send with immediate receive completion has wrong size
IB/qib: Set port physical state even if other fields are invalid
IB/qib: Generate completion callback on errors
... -
Signed-off-by: Benjamin Herrenschmidt
