tracing/core: use appropriate waiting on trace_pipe
Impact: api and pipe waiting change
Currently, the waiting used in tracing_read_pipe() is done through a
100 msecs schedule_timeout() loop which periodically check if there
are traces on the buffer.
This can cause small latencies for programs which are reading the incoming
events.
This patch makes the reader waiting for the trace_wait waitqueue except
for few tracers such as the sched and functions tracers which might be
already hold the runqueue lock while waking up the reader.
This is performed through a new callback wait_pipe() on struct tracer.
If none is implemented on a specific tracer, the default waiting for
trace_wait queue is attached.
Steven Rostedt [Tue, 17 Feb 2009 18:12:12 +0000 (13:12 -0500)]
ftrace: show unlimited when traceon or traceoff has no counter
Impact: clean up
The traceon and traceoff function probes are confusing to developers
to what happens when a counter is not specified. This should help
clear things up.
Steven Rostedt [Tue, 17 Feb 2009 17:32:04 +0000 (12:32 -0500)]
ftrace: rename _hook to _probe
Impact: clean up
Ingo Molnar did not like the _hook naming convention used by the
select function tracer. Luis Claudio R. Goncalves suggested using
the "_probe" extension. This patch implements the change of
calling the functions and variables "_hook" and replacing them
with "_probe".
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Steven Rostedt [Tue, 17 Feb 2009 04:06:01 +0000 (23:06 -0500)]
ftrace: add pretty print to selected fuction traces
This patch adds a call back for the tracers that have hooks to
selected functions. This allows the tracer to show better output
in the set_ftrace_filter file.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Steven Rostedt [Sun, 15 Feb 2009 00:04:24 +0000 (19:04 -0500)]
ftrace: add traceon traceoff commands to enable/disable the buffers
This patch adds the new function selection commands traceon and
traceoff. traceon sets the function to enable the ring buffers
while traceoff disables the ring buffers. You can pass in the
number of times you want the command to be executed when the function
is hit. It will only execute if the state of the buffers are not
already in that state.
Example:
# echo do_fork:traceon:4
Will enable the ring buffers if they are disabled every time it
hits do_fork, up to 4 times.
# echo sys_close:traceoff
This will disable the ring buffers every time (unlimited) when
sys_close is called.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Steven Rostedt [Sat, 14 Feb 2009 20:29:06 +0000 (15:29 -0500)]
ftrace: trace different functions with a different tracer
Impact: new feature
Currently, the function tracer only gives you an ability to hook
a tracer to all functions being traced. The dynamic function trace
allows you to pick and choose which of those functions will be
traced, but all functions being traced will call all tracers that
registered with the function tracer.
This patch adds a new feature that allows a tracer to hook to specific
functions, even when all functions are being traced. It allows for
different functions to call different tracer hooks.
The way this is accomplished is by a special function that will hook
to the function tracer and will set up a hash table knowing which
tracer hook to call with which function. This is the most general
and easiest method to accomplish this. Later, an arch may choose
to supply their own method in changing the mcount call of a function
to call a different tracer. But that will be an exercise for the
future.
To register a function:
struct ftrace_hook_ops {
void (*func)(unsigned long ip,
unsigned long parent_ip,
void **data);
int (*callback)(unsigned long ip, void **data);
void (*free)(void **data);
};
int register_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops,
void *data);
glob is a simple glob to search for the functions to hook.
ops is a pointer to the operations (listed below)
data is the default data to be passed to the hook functions when traced
ops:
func is the hook function to call when the functions are traced
callback is a callback function that is called when setting up the hash.
That is, if the tracer needs to do something special for each
function, that is being traced, and wants to give each function
its own data. The address of the entry data is passed to this
callback, so that the callback may wish to update the entry to
whatever it would like.
free is a callback for when the entry is freed. In case the tracer
allocated any data, it is give the chance to free it.
This will unregister all hooks that match glob, point to ops, and
have its data matching data. (note, if glob is NULL, blank or '*',
all functions will be tested).
Steven Rostedt [Sat, 14 Feb 2009 06:42:44 +0000 (01:42 -0500)]
ftrace: consolidate mutexes
Impact: clean up
Now that ftrace_lock is a mutex, there is no reason to have three
different mutexes protecting similar data. All the mutex paths
are not in hot paths, so having a mutex to cover more data is
not a problem.
This patch removes the ftrace_sysctl_lock and ftrace_start_lock
and uses the ftrace_lock to protect the locations that were protected
by these locks. By doing so, this change also removes some of
the lock nesting that was taking place.
There are still more mutexes in ftrace.c that can probably be
consolidated, but they can be dealt with later. We need to be careful
about the way the locks are nested, and by consolidating, we can cause
a recursive deadlock.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Steven Rostedt [Sat, 14 Feb 2009 06:15:39 +0000 (01:15 -0500)]
ftrace: convert ftrace_lock from a spinlock to mutex
Impact: clean up
The older versions of ftrace required doing the ftrace list
search under atomic context. Now all the calls are in non-atomic
context. There is no reason to keep the ftrace_lock as a spinlock.
This patch converts it to a mutex.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Steven Rostedt [Sat, 14 Feb 2009 05:40:25 +0000 (00:40 -0500)]
ftrace: add command interface for function selection
Allow for other tracers to add their own commands for function
selection. This interface gives a trace the ability to name a
command for function selection. Right now it is pretty limited
in what it offers, but this is a building step for more features.
The :mod: command is converted to this interface and also serves
as a template for other implementations.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Steven Rostedt [Sat, 14 Feb 2009 01:53:42 +0000 (20:53 -0500)]
ftrace: enable filtering only when a function is filtered on
Impact: fix to prevent empty set_ftrace_filter and no ftrace output
The function filter is used to only trace a given set of functions.
The filter is enabled when a function name is echoed into the
set_ftrace_filter file. But if the name has a typo and the function
is not found, the filter is enabled, but no function is listed.
This makes a confusing situation where set_ftrace_filter is empty
but no functions ever get enabled for tracing.
This patch changes that to only enable filtering if a function
is set to be filtered on. Now, the filter is not enabled if
a bad name is echoed into set_ftrace_filter.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Steven Rostedt [Fri, 13 Feb 2009 20:56:43 +0000 (15:56 -0500)]
ftrace: break up ftrace_match_records into smaller components
Impact: clean up
ftrace_match_records does a lot of things that other features
can use. This patch breaks up ftrace_match_records and pulls
out ftrace_setup_glob and ftrace_match_record.
ftrace_setup_glob prepares a simple glob expression for use with
ftrace_match_record. ftrace_match_record compares a single record
with a glob type.
Breaking this up will allow for more features to run on individual
records.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Steven Rostedt [Fri, 13 Feb 2009 19:37:33 +0000 (14:37 -0500)]
ftrace: rename ftrace_match to ftrace_match_records
Impact: clean up
ftrace_match is too generic of a name. What it really does is
search all records and matches the records with the given string,
and either sets or unsets the functions to be traced depending
on if the parameter 'enable' is set or not.
This allows us to make another function called ftrace_match that
can be used to test a single record.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Steven Rostedt [Fri, 13 Feb 2009 17:43:56 +0000 (12:43 -0500)]
ftrace: add do_for_each_ftrace_rec and while_for_each_ftrace_rec
Impact: clean up
To iterate over all the functions that dynamic trace knows about
it requires two for loops. One to iterate over the pages and the
other to iterate over the records within the page.
There are several duplications of these loops in ftrace.c. This
patch creates the macros do_for_each_ftrace_rec and
while_for_each_ftrace_rec to handle this logic, and removes the
duplicate code.
While making this change, I also discovered and fixed a small
bug that one of the iterations should exit the loop after it found the
record it was searching for. This used a break when it should have
used a goto, since there were two loops it needed to break out
from. No real harm was done by this bug since it would only continue
to search the other records, and the code was in a slow path anyway.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Rakib Mullick [Sat, 14 Feb 2009 03:36:00 +0000 (09:36 +0600)]
tracing: fix section mismatch in trace_hw_branches.c
The function bts_trace_init() references a variable
bts_hotcpu_notifier which is marked
as __cpuinitdata. Thus causes section mismatch. This patch fixes it.
LD kernel/trace/built-in.o
WARNING: kernel/trace/built-in.o(.text+0xc90c): Section mismatch in
reference from the function bts_trace_init() to the variable
.cpuinit.data:bts_hotcpu_notifier
The function bts_trace_init() references
the variable __cpuinitdata bts_hotcpu_notifier.
This is often because bts_trace_init lacks a __cpuinitdata
annotation or the annotation of bts_hotcpu_notifier is wrong.
WARNING: kernel/trace/built-in.o(.text+0xc92a): Section mismatch in
reference from the function bts_trace_reset() to the variable
.cpuinit.data:bts_hotcpu_notifier
The function bts_trace_reset() references
the variable __cpuinitdata bts_hotcpu_notifier.
This is often because bts_trace_reset lacks a __cpuinitdata
annotation or the annotation of bts_hotcpu_notifier is wrong.
Pekka Paalanen [Sat, 3 Jan 2009 19:09:27 +0000 (21:09 +0200)]
doc: mmiotrace.txt, buffer size control change
Impact: prevents confusing the user when buffer size is inadequate
The tracing framework offers a resizeable buffer, which mmiotrace uses
to record events. If the buffer is full, the following events will be
lost. Events should not be lost, so the documentation instructs the user
to increase the buffer size. The buffer size is set via a debugfs file.
Mmiotrace documentation was not updated the same time the debugfs file
was changed. The old file was tracing/trace_entries and first contained
the number of entries the buffer had space for, per cpu. Nowadays this
file is replaced with the file tracing/buffer_size_kb, which tells the
amount of memory reserved for the buffer, per cpu, in kilobytes.
Previously, a flag had to be toggled via the debugfs file
tracing/tracing_enabled when the buffer size was changed. This is no
longer necessary.
The mmiotrace documentation is updated to reflect the current state of
the tracing framework.
Signed-off-by: Pekka Paalanen <pq@iki.fi> Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Pekka Paalanen [Sat, 3 Jan 2009 19:23:51 +0000 (21:23 +0200)]
trace: mmiotrace to the tracer menu in Kconfig
Impact: cosmetic change in Kconfig menu layout
This patch was originally suggested by Peter Zijlstra, but seems it
was forgotten.
CONFIG_MMIOTRACE and CONFIG_MMIOTRACE_TEST were selectable
directly under the Kernel hacking / debugging menu in the kernel
configuration system. They were present only for x86 and x86_64.
Other tracers that use the ftrace tracing framework are in their own
sub-menu. This patch moves the mmiotrace configuration options there.
Since the Kconfig file, where the tracer menu is, is not architecture
specific, HAVE_MMIOTRACE_SUPPORT is introduced and provided only by
x86/x86_64. CONFIG_MMIOTRACE now depends on it.
Signed-off-by: Pekka Paalanen <pq@iki.fi> Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Pekka Paalanen [Tue, 6 Jan 2009 11:57:11 +0000 (13:57 +0200)]
mmiotrace: count events lost due to not recording
Impact: enhances lost events counting in mmiotrace
The tracing framework, or the ring buffer facility it uses, has a switch
to stop recording data. When recording is off, the trace events will be
lost. The framework does not count these, so mmiotrace has to count them
itself.
Signed-off-by: Pekka Paalanen <pq@iki.fi> Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Linus Torvalds [Fri, 13 Feb 2009 16:19:11 +0000 (08:19 -0800)]
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6:
ASoC: Only register AC97 bus if it's not done already
ALSA: hda - Add snd_hda_multi_out_dig_cleanup()
ALSA: hda - Add missing terminator in slave dig-out array
ALSA: hda - Change HP dv7 (103c:30f4) quirk from hp-m4 to hp-dv5 model
ALSA: hda - Register (new) devices at reconfig
ALSA: mtpav - Fix initial value for input hwport
ALSA: hda - add id for Intel IbexPeak integrated HDMI codec
ALSA: hda - compute checksum in HDMI audio infoframe
ALSA: hda - enable HDMI audio pin out at module loading time
ALSA: hda - allow multi-channel HDMI audio playback when ELD is not present
ASoC: Update SDP3430 machine driver for snd_soc_card
ALSA: hda - Add quirk for Asus z37e (1043:8284)
sound: Remove OSSlib stuff from linux/soundcard.h
ASoC: WM8990: Fix kcontrol's private value use in put callback
ASoC: TLV320AIC3X: Fix kcontrol's private value use in put callback
Serge E. Hallyn [Fri, 13 Feb 2009 14:04:21 +0000 (14:04 +0000)]
User namespaces: Only put the userns when we unhash the uid
uids in namespaces other than init don't get a sysfs entry.
For those in the init namespace, while we're waiting to remove
the sysfs entry for the uid the uid is still hashed, and
alloc_uid() may re-grab that uid without getting a new
reference to the user_ns, which we've already put in free_user
before scheduling remove_user_sysfs_dir().
Mark Brown [Thu, 12 Feb 2009 19:33:19 +0000 (19:33 +0000)]
ASoC: Only register AC97 bus if it's not done already
ASoC supports both explicit codec drivers for AC97 devices and a simple
driver which uses the standard ALSA AC97 framework for codec support.
When used with the generic AC97 codec support that will provide the
ad hoc AC97 device for drivers like touchscreens to attach to so the
core shouldn't do so.
Reported-by: Manuel Lauss <mano@roarinelk.homelinux.net> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Takashi Iwai [Fri, 13 Feb 2009 10:32:28 +0000 (11:32 +0100)]
ALSA: hda - Add snd_hda_multi_out_dig_cleanup()
Added the helper function snd_hda_multi_out_dig_cleanup() to clean up
the digital outputs with multi setup. This call is needed in cases
the codec supports multiple digital outputs as slaves. Otherwise the
slave widgets aren't properly cleaned up.
For a single digital output (e.g. in patch_conexant.c), this call isn't
needed.
ALSA: hda - Change HP dv7 (103c:30f4) quirk from hp-m4 to hp-dv5 model
Change HP dv7 quirk: although reported to work with hp-m4 model
(https://bugzilla.novell.com/show_bug.cgi?id=445321), the original
report doesn't contain info about testing of internal microphone.
Recently I received a report about internal mic not working
(https://qa.mandriva.com/show_bug.cgi?id=44855#c193), this must be
related with the forced line in on pin 0x0e done with hp-m4 model. Thus
change the current quirk from STAC_HP_M4 to STAC_HP_DV5, later reported
to be fixed on a provided kernel with this change
(https://qa.mandriva.com/show_bug.cgi?id=44855#c196).
Signed-off-by: Herton Ronaldo Krzesinski <herton@mandriva.com.br> Signed-off-by: Takashi Iwai <tiwai@suse.de>
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (32 commits)
wimax: fix oops in wimax_dev_get_by_genl_info() when looking up non-wimax iface
net: 4 bytes kernel memory disclosure in SO_BSDCOMPAT gsopt try #2
netxen: fix compile waring "label ‘set_32_bit_mask’ defined but not used" on IA64 platform
bnx2: Update version to 1.9.2 and copyright.
bnx2: Fix jumbo frames error handling.
bnx2: Update 5709 firmware.
bnx2: Update 5706/5708 firmware.
3c505: do not set pcb->data.raw beyond its size
Documentation/connector/cn_test.c: don't use gfp_any()
net: don't use in_atomic() in gfp_any()
IRDA: cnt is off by 1
netxen: remove pcie workaround
sun3: print when lance_open() fails
qlge: bugfix: Add missing rx buf clean index on early exit.
qlge: bugfix: Fix RX scaling values.
qlge: bugfix: Fix TSO breakage.
qlge: bugfix: Add missing dev_kfree_skb_any() call.
qlge: bugfix: Add missing put_page() call.
qlge: bugfix: Fix fatal error recovery hang.
qlge: bugfix: Use netif_receive_skb() and vlan_hwaccel_receive_skb().
...
wimax: fix oops in wimax_dev_get_by_genl_info() when looking up non-wimax iface
When a non-wimax interface is looked up by the stack, a bad pointer is
returned when the looked-up interface is not found in the list (of
registered WiMAX interfaces). This causes an oops in the caller when
trying to use the pointer.
Fix by properly setting the pointer to NULL if we don't exit from the
list_for_each() with a found entry.
Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
In function sock_getsockopt() located in net/core/sock.c, optval v.val
is not correctly initialized and directly returned in userland in case
we have SO_BSDCOMPAT option set.
Yang Hongyang [Fri, 13 Feb 2009 00:57:12 +0000 (16:57 -0800)]
netxen: fix compile waring "label ‘set_32_bit_mask’ defined but not used" on IA64 platform
When compile the latest kernel on IA64 platform,I got a warning:
drivers/net/netxen/netxen_nic_main.c:203: warning: label ‘set_32_bit_mask’
defined but not used
We do not need label ‘set_32_bit_mask’ on IA64 platform,So move it to #else.
Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Michael Chan [Fri, 13 Feb 2009 00:54:13 +0000 (16:54 -0800)]
bnx2: Fix jumbo frames error handling.
If errors are reported on a frame descriptor, we need to
account for the buffer pages that may have been used for this
error packet and recycle them. Otherwise, we may get the wrong
pages for the next packet.
Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: Matt Carlson <mcarlson@broadcom.com> Signed-off-by: Benjamin Li <benli@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Michael Chan [Fri, 13 Feb 2009 00:53:48 +0000 (16:53 -0800)]
bnx2: Update 5709 firmware.
New firmware fixes a data corruption issue when receiving and
placing jumbo frames into host buffers. In some cases, the
buffer descriptor is not updated correctly and this will lead
to the driver linking the wrong number of pages into the SKB.
Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Michael Chan [Fri, 13 Feb 2009 00:53:22 +0000 (16:53 -0800)]
bnx2: Update 5706/5708 firmware.
New firmware fixes a data corruption issue when receiving and
placing jumbo frames into host buffers. In some cases, the
buffer descriptor is not updated correctly and this will lead
to the driver linking the wrong number of pages into the SKB.
Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Roel Kluin [Fri, 13 Feb 2009 00:52:31 +0000 (16:52 -0800)]
3c505: do not set pcb->data.raw beyond its size
Ensure that we do not set pcb->data.raw beyond its size, print an error message
and return false if we attempt to. A timout message was printed one too early.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Andrew Morton [Fri, 13 Feb 2009 00:43:17 +0000 (16:43 -0800)]
net: don't use in_atomic() in gfp_any()
The problem is that in_atomic() will return false inside spinlocks if
CONFIG_PREEMPT=n. This will lead to deadlockable GFP_KERNEL allocations
from spinlocked regions.
Secondly, if CONFIG_PREEMPT=y, this bug solves itself because networking
will instead use GFP_ATOMIC from this callsite. Hence we won't get the
might_sleep() debugging warnings which would have informed us of the buggy
callsites.
Solve both these problems by switching to in_interrupt(). Now, if someone
runs a gfp_any() allocation from inside spinlock we will get the warning
if CONFIG_PREEMPT=y.
I reviewed all callsites and most of them were too complex for my little
brain and none of them documented their interface requirements. I have no
idea what this patch will do.
Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Ron Mercer [Fri, 13 Feb 2009 00:38:34 +0000 (16:38 -0800)]
qlge: bugfix: Add missing rx buf clean index on early exit.
The large receive buffer queue is not properly tracking the current
index in the case where an early exit occurs. This can happen when a
page alloc or dma mapping fails. If this occurs the queue will get
out of sync and invalid indexes can be written to the hardware.
Signed-off-by: Ron Mercer <ron.mercer@qlogic.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Ron Mercer [Fri, 13 Feb 2009 00:38:18 +0000 (16:38 -0800)]
qlge: bugfix: Fix RX scaling values.
Receive packets were only scaling across 2 of the receive queues. The
value was hardcoded to 2 instead of being based on how many rx queues
were running.
Signed-off-by: Ron Mercer <ron.mercer@qlogic.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Ron Mercer [Fri, 13 Feb 2009 00:36:50 +0000 (16:36 -0800)]
qlge: bugfix: Use netif_receive_skb() and vlan_hwaccel_receive_skb().
Replace calls to vlan_hwaccel_rx() and netif_rx().
Thanks to Dave Miller for pointing out the the driver was making
the wrong upcall for passing packets into the stack.
Signed-off-by: Ron Mercer <ron.mercer@qlogic.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Steven Rostedt [Thu, 12 Feb 2009 19:16:46 +0000 (14:16 -0500)]
sched: do not account for NMIs
Impact: avoid corruption in system time accounting
Martin Schwidefsky told me that there was an issue with NMIs and
system accounting. The problem is that the accounting code is
not reentrant, and if an NMI goes off after an interrupt it can
corrupt the accounting.
For now, the best we can do is to treat NMIs like SMIs and they
are not accounted for.
This patch changes nmi_enter to not call __irq_enter and to do
the preempt-count and tracing calls directly.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Steven Rostedt [Thu, 12 Feb 2009 15:53:37 +0000 (10:53 -0500)]
preempt-count: force hardirq-count to max of 10
To add a bit in the preempt_count to be set when in NMI context, we
found that some archs did not have enough bits to spare. This is
due to the hardirq_count being a mask that can hold NR_IRQS.
Some archs allow for over 16000 IRQs, and that would require a mask
of 14 bits. The sofitrq mask is 8 bits and the preempt disable mask
is also 8 bits. The PREEMP_ACTIVE bit is bit 30, and bit 31 would
make the preempt_count (which is type int) a negative number.
A negative preempt_count is a sign of failure.
Add them up 14+8+8+1+1 you get 32 bits. No room for the NMI bit.
But the hardirq_count is to track the number of nested IRQs, not
the number of total IRQs. This originally took the paranoid approach
of setting the max nesting to NR_IRQS. But when we have archs with
over 1000 IRQs, it is not practical to think they will ever all
nest on a single CPU. Not to mention that this would most definitely
cause a stack overflow.
This patch sets a max of 10 bits to be used for IRQ nesting.
I did a 'git grep HARDIRQ' to examine all users of HARDIRQ_BITS and
HARDIRQ_MASK, and found that making it a max of 10 would not hurt
anyone. I did find that the m68k expected it to be 8 bits, so
I allow for the archs to set the number to be less than 10.
I removed the setting of HARDIRQ_BITS from the archs that set it
to more than 10. This includes ALPHA, ia64 and avr32.
This will always allow room for the NMI bit, and if we need to allow
for NMI nesting, we have 4 bits to play with.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Nick Piggin [Thu, 12 Feb 2009 03:34:23 +0000 (04:34 +0100)]
Fix page writeback thinko, causing Berkeley DB slowdown
A bug was introduced into write_cache_pages cyclic writeout by commit 31a12666d8f0c22235297e1c1575f82061480029 ("mm: write_cache_pages cyclic
fix"). The intention (and comments) is that we should cycle back and
look for more dirty pages at the beginning of the file if there is no
more work to be done.
But the !done condition was dropped from the test. This means that any
time the page writeout loop breaks (eg. due to nr_to_write == 0), we
will set index to 0, then goto again. This will set done_index to
index, then find done is set, so will proceed to the end of the
function. When updating mapping->writeback_index for cyclic writeout,
we now use done_index == 0, so we're always cycling back to 0.
This seemed to be causing random mmap writes (slapadd and iozone) to
start writing more pages from the LRU and writeout would slowdown, and
caused bugzilla entry
http://bugzilla.kernel.org/show_bug.cgi?id=12604
about Berkeley DB slowing down dramatically.
With this patch, iozone random write performance is increased nearly
5x on my system (iozone -B -r 4k -s 64k -s 512m -s 1200m on ext2).
Signed-off-by: Nick Piggin <npiggin@suse.de> Reported-and-tested-by: Jan Kara <jack@suse.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Takashi Iwai [Wed, 11 Feb 2009 23:06:42 +0000 (00:06 +0100)]
ALSA: mtpav - Fix initial value for input hwport
Fix the initial value for input hwport. The old value (-1) may cause
Oops when an realtime MIDI byte is received before the input port is
explicitly given.
Instead, now it's set to the broadcasting as default.
When the temperature exceeds 32767 milli-degrees the temperature overflows
to -32768 millidegrees. These are bothe well within the -55 - +125 degree
range for the sensor.
Fix overflow in left-shift of a u8.
Signed-off-by: Ian Dall <ian@beware.dropbear.id.au> Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This can also occur when an nbd device loses its nbd-client/server
connection. Although we clear the queue of any outstanding I/Os after the
client/server connection fails, any additional I/Os that get queued later
will hang.
This bug may also be the problem reported in this bug report:
http://bugzilla.kernel.org/show_bug.cgi?id=12277
Testing would need to be performed to determine if the two issues are the
same.
This problem was introduced by the new request handling thread code ("NBD:
allow nbd to be used locally", 3/2008), which entered into mainline around
2.6.25.
The fix, which is fairly simple, is to restore the check for lo->sock
being NULL in do_nbd_request. This causes I/O to an uninitialized nbd to
immediately fail with an I/O error, as it did prior to the introduction of
this bug.
Signed-off-by: Paul Clements <paul.clements@steeleye.com> Reported-by: Jon Nelson <jnelson-kernel-bugzilla@jamponi.net> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: <stable@kernel.org> [2.6.26.x, 2.6.27.x, 2.6.28.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm: rearrange exit_mmap() to unlock before arch_exit_mmap
Christophe Saout reported [in precursor to:
http://marc.info/?l=linux-kernel&m=123209902707347&w=4]:
> Note that I also some a different issue with CONFIG_UNEVICTABLE_LRU.
> Seems like Xen tears down current->mm early on process termination, so
> that __get_user_pages in exit_mmap causes nasty messages when the
> process had any mlocked pages. (in fact, it somehow manages to get into
> the swapping code and produces a null pointer dereference trying to get
> a swap token)
Jeremy explained:
Yes. In the normal case under Xen, an in-use pagetable is "pinned",
meaning that it is RO to the kernel, and all updates must go via hypercall
(or writes are trapped and emulated, which is much the same thing). An
unpinned pagetable is not currently in use by any process, and can be
directly accessed as normal RW pages.
As an optimisation at process exit time, we unpin the pagetable as early
as possible (switching the process to init_mm), so that all the normal
pagetable teardown can happen with direct memory accesses.
This happens in exit_mmap() -> arch_exit_mmap(). The munlocking happens
a few lines below. The obvious thing to do would be to move
arch_exit_mmap() to below the munlock code, but I think we'd want to
call it even if mm->mmap is NULL, just to be on the safe side.
Thus, this patch:
exit_mmap() needs to unlock any locked vmas before calling arch_exit_mmap,
as the latter may switch the current mm to init_mm, which would cause the
former to fail.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Christophe Saout <christophe@saout.de> Cc: Keir Fraser <keir.fraser@eu.citrix.com> Cc: Christophe Saout <christophe@saout.de> Cc: Alex Williamson <alex.williamson@hp.com> Cc: <stable@kernel.org> [2.6.28.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Jiri Slaby [Wed, 11 Feb 2009 21:04:40 +0000 (13:04 -0800)]
parport: parport_serial, don't bind netmos ibm 0299
Since netmos 9835 with subids 0x1014(IBM):0x0299 is now bound with
serial/8250_pci, because it has no parallel ports and subdevice id isn't
in the expected form, return -ENODEV from probe function.
Heiko Carstens [Wed, 11 Feb 2009 21:04:38 +0000 (13:04 -0800)]
syscall define: fix uml compile bug
With the new system call defines we get this on uml:
arch/um/sys-i386/built-in.o: In function `sys_call_table':
(.rodata+0x308): undefined reference to `sys_sigprocmask'
Reason for this is that uml passes the preprocessor option
-Dsigprocmask=kernel_sigprocmask to gcc when compiling the kernel.
This causes SYSCALL_DEFINE3(sigprocmask, ...) to be expanded to
SYSCALL_DEFINEx(3, kernel_sigprocmask, ...) and finally to a system
call named sys_kernel_sigprocmask. However sys_sigprocmask is missing
because of this.
To avoid macro expansion for the system call name just concatenate the
name at first define instead of carrying it through severel levels.
This was pointed out by Al Viro.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Reviewed-by: WANG Cong <wangcong@zeuux.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Carsten Otte [Wed, 11 Feb 2009 21:04:37 +0000 (13:04 -0800)]
ext2/xip: refuse to change xip flag during remount with busy inodes
For a reason that I was unable to understand in three months of debugging,
mount ext2 -o remount stopped working properly when remounting from
regular operation to xip, or the other way around. According to a git
bisect search, the problem was introduced with the VM_MIXEDMAP/PTE_SPECIAL
rework in the vm:
In the failing scenario, the filesystem is mounted read only via root=
kernel parameter on s390x. During remount (in rc.sysinit), the inodes of
the bash binary and its libraries are busy and cannot be invalidated (the
bash which is running rc.sysinit resides on subject filesystem).
Afterwards, another bash process (running ifup-eth) recurses into a
subshell, runs dup_mm (via fork). Some of the mappings in this bash
process were created from inodes that could not be invalidated during
remount.
Both parent and child process crash some time later due to inconsistencies
in their address spaces. The issue seems to be timing sensitive, various
attempts to recreate it have failed.
This patch refuses to change the xip flag during remount in case some
inodes cannot be invalidated. This patch keeps users from running into
that issue.
[akpm@linux-foundation.org: cleanup] Signed-off-by: Carsten Otte <cotte@de.ibm.com> Cc: Nick Piggin <npiggin@suse.de> Cc: Jared Hulbert <jaredeh@gmail.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Li Zefan [Wed, 11 Feb 2009 21:04:36 +0000 (13:04 -0800)]
cgroups: fix lockdep subclasses overflow
I enabled all cgroup subsystems when compiling kernel, and then:
# mount -t cgroup -o net_cls xxx /mnt
# mkdir /mnt/0
This showed up immediately:
BUG: MAX_LOCKDEP_SUBCLASSES too low!
turning off the locking correctness validator.
It's caused by the cgroup hierarchy lock:
for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
struct cgroup_subsys *ss = subsys[i];
if (ss->root == root)
mutex_lock_nested(&ss->hierarchy_mutex, i);
}
Now we have 9 cgroup subsystems, and the above 'i' for net_cls is 8, but
MAX_LOCKDEP_SUBCLASSES is 8.
This patch uses different lockdep keys for different subsystems.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Randy Dunlap [Wed, 11 Feb 2009 21:04:33 +0000 (13:04 -0800)]
kernel-doc: fix syscall wrapper processing
Fix kernel-doc processing of SYSCALL wrappers.
The SYSCALL wrapper patches played havoc with kernel-doc for
syscalls. Syscalls that were scanned for DocBook processing
reported warnings like this one, for sys_tgkill:
Warning(kernel/signal.c:2285): No description found for parameter 'tgkill'
Warning(kernel/signal.c:2285): No description found for parameter 'pid_t'
Warning(kernel/signal.c:2285): No description found for parameter 'int'
because the macro parameters all "look like" function parameters,
although they are not:
/**
* sys_tgkill - send signal to one specific thread
* @tgid: the thread group ID of the thread
* @pid: the PID of the thread
* @sig: signal to be sent
*
* This syscall also checks the @tgid and returns -ESRCH even if the PID
* exists but it's not belonging to the target process anymore. This
* method solves the problem of threads exiting and PIDs getting reused.
*/
SYSCALL_DEFINE3(tgkill, pid_t, tgid, pid_t, pid, int, sig)
{
...
This patch special-cases the handling SYSCALL_DEFINE* function
prototypes by expanding them to
long sys_foobar(type1 arg1, type1 arg2, ...)
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Randy Dunlap [Wed, 11 Feb 2009 21:04:31 +0000 (13:04 -0800)]
kernel-doc: preferred ending marker and examples
Fix kernel-doc-nano-HOWTO.txt to use */ as the ending marker in kernel-doc
examples and state that */ is the preferred ending marker.
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Reported-by: Robert Love <robert.w.love@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
MinChan Kim [Wed, 11 Feb 2009 21:04:27 +0000 (13:04 -0800)]
mm: fix mlocked page counter mismatch
When I tested following program, I found that the mlocked counter
is strange. It cannot free some mlocked pages.
It is because try_to_unmap_file() doesn't check real
page mappings in vmas.
That is because the goal of an address_space for a file is to find all
processes into which the file's specific interval is mapped. It is
related to the file's interval, not to pages.
Even if the page isn't really mapped by the vma, it returns SWAP_MLOCK
since the vma has VM_LOCKED, then calls try_to_mlock_page. After this the
mlocked counter is increased again.
COWed anon page in a file-backed vma could be a such case. This patch
resolves it.
Since journal_start_commit() is now fixed to return 1 when we started a
transaction commit, there's some transaction waiting to be committed or
there's a transaction already committing, we don't need to call
ext3_force_commit() in ext3_sync_fs(). Furthermore ext3_force_commit()
can unnecessarily create sync transaction which is expensive so it's
worthwhile to remove it when we can.
Cc: Eric Sandeen <sandeen@redhat.com> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Jan Kara [Wed, 11 Feb 2009 21:04:25 +0000 (13:04 -0800)]
jbd: fix return value of journal_start_commit()
journal_start_commit() returns 1 if either a transaction is committing or
the function has queued a transaction commit. But it returns 0 if we
raced with somebody queueing the transaction commit as well. This
resulted in ext3_sync_fs() not functioning correctly (description from
Arthur Jones): In the case of a data=ordered umount with pending long
symlinks which are delayed due to a long list of other I/O on the backing
block device, this causes the buffer associated with the long symlinks to
not be moved to the inode dirty list in the second phase of fsync_super.
Then, before they can be dirtied again, kjournald exits, seeing the UMOUNT
flag and the dirty pages are never written to the backing block device,
causing long symlink corruption and exposing new or previously freed block
data to userspace.
This can be reproduced with a script created by Eric Sandeen
<sandeen@redhat.com>:
#!/bin/bash
umount /mnt/test2
mount /dev/sdb4 /mnt/test2
rm -f /mnt/test2/*
dd if=/dev/zero of=/mnt/test2/bigfile bs=1M count=512
touch /mnt/test2/thisisveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryverylongfilename
ln -s /mnt/test2/thisisveryveryveryveryveryveryveryveryveryveryveryveryveryveryveryverylongfilename
/mnt/test2/link
umount /mnt/test2
mount /dev/sdb4 /mnt/test2
ls /mnt/test2/
This patch fixes journal_start_commit() to always return 1 when there's
a transaction committing or queued for commit.
Cc: Eric Sandeen <sandeen@redhat.com> Cc: Mike Snitzer <snitzer@gmail.com> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
projects / linux-2.6-omap-h63xx.git / log