Andrew Paprocki [Mon, 15 Oct 2007 19:43:12 +0000 (15:43 -0400)]
libata: prevent devices with blank model names from being DMA blacklisted
The strn_pattern_cmp routine does not handle a blank name parameter
properly. The only patterns which should match a blank name are "*"
and an explicit "". If the function is passed a blank name in current
code, it will always match against the patt parameter. The bug manifests
itself as the device with the empty model name always matching the first
device in the DMA blacklist, forcing it to revert to PIO mode.
Signed-off-by: Andrew Paprocki <andrew@ishiboo.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This is a driver for the ATA controller on the Geode CS5536 companion
chip. The PCI device ID for this device was previously claimed by
pata_amd.c but the PIO timings were not correct. This driver also
works around a bug in some BIOSes that handle unaligned access to the
PCI config registers poorly. Finally, the driver allows fallback to
using MSR registers for configuration on BIOSes that are truly
broken.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Tejun Heo [Wed, 10 Oct 2007 06:57:44 +0000 (15:57 +0900)]
libata: fix revalidation issuing after configuration commands
After commands which can change device configuration, EH is scheduled
to revalidate and reconfigure the device. Host link was incorrectly
used unconditionally when scheduling EH action. This resulted in
bogus revalidation request and mismatched configuration between device
and driver. Fix it.
This bug was reported by Igor Durdanovic.
Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Igor Durdanovic <idurdanovic@comcast.net> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Kuan Luo [Mon, 15 Oct 2007 19:16:53 +0000 (15:16 -0400)]
[libata] sata_nv: add SW NCQ support for MCP51/MCP55/MCP61
Add the Software NCQ support to sata_nv.c for MCP51/MCP55/MCP61 SATA
controller. NCQ function is disable by default, you can enable it
with 'swncq=1'. NCQ will be turned off if the drive is Maxtor on
MCP51 or MCP55 rev 0xa2 platform.
[akpm@linux-foundation.org: build fix] Signed-off-by: Kuan Luo <kluo@nvidia.com> Signed-off-by: Peer Chen <pchen@nvidia.com> Cc: Zoltan Boszormenyi <zboszor@dunaweb.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This patch adds MMIO support to the pata_sil680 for taskfile IOs,
based on what the old siimage does.
I haven't bothered changing the chip setup stuff from PCI config
cycles to MMIO though (siimage does it), I don't think it matters,
I've only adapted it to use MMIO for taskfile accesses.
I've tested it on a Cell blade and it seems to work fine.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Linus Torvalds [Mon, 15 Oct 2007 17:46:05 +0000 (10:46 -0700)]
Merge git://git.linux-nfs.org/pub/linux/nfs-2.6
* git://git.linux-nfs.org/pub/linux/nfs-2.6: (131 commits)
NFSv4: Fix a typo in nfs_inode_reclaim_delegation
NFS: Add a boot parameter to disable 64 bit inode numbers
NFS: nfs_refresh_inode should clear cache_validity flags on success
NFS: Fix a connectathon regression in NFSv3 and NFSv4
NFS: Use nfs_refresh_inode() in ops that aren't expected to change the inode
SUNRPC: Don't call xprt_release in call refresh
SUNRPC: Don't call xprt_release() if call_allocate fails
SUNRPC: Fix buggy UDP transmission
[23/37] Clean up duplicate includes in
[2.6 patch] net/sunrpc/rpcb_clnt.c: make struct rpcb_program static
SUNRPC: Use correct type in buffer length calculations
SUNRPC: Fix default hostname created in rpc_create()
nfs: add server port to rpc_pipe info file
NFS: Get rid of some obsolete macros
NFS: Simplify filehandle revalidation
NFS: Ensure that nfs_link() returns a hashed dentry
NFS: Be strict about dentry revalidation when doing exclusive create
NFS: Don't zap the readdir caches upon error
NFS: Remove the redundant nfs_reval_fsid()
NFSv3: Always use directory post-op attributes in nfs3_proc_lookup
...
Fix up trivial conflict due to sock_owned_by_user() cleanup manually in
net/sunrpc/xprtsock.c
Linus Torvalds [Mon, 15 Oct 2007 15:18:44 +0000 (08:18 -0700)]
Merge branch 'agp-patches' of master.kernel.org:/pub/scm/linux/kernel/git/airlied/agp-2.6
* 'agp-patches' of master.kernel.org:/pub/scm/linux/kernel/git/airlied/agp-2.6:
fix use after free in amd create gatt pages
AGP fix race condition between unmapping and freeing pages
Linus Torvalds [Mon, 15 Oct 2007 15:17:26 +0000 (08:17 -0700)]
Merge branch 'drm-patches' of ssh://master.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
* 'drm-patches' of ssh://master.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
via invalid device ids removal
radeon: Commit the ring after each partial texture upload blit.
i915: fix vbl swap allocation size.
drm: Replace DRM_IOCTL_ARGS with (dev, data, file_priv) and remove DRM_DEVICE.
drm: remove XFREE86_VERSION macros.
drm: Replace filp in ioctl arguments with drm_file *file_priv.
drm: Remove DRM_ERR OS macro.
Linus Torvalds [Mon, 15 Oct 2007 15:16:53 +0000 (08:16 -0700)]
Merge branch 'nfs-server-stable' of git://linux-nfs.org/~bfields/linux
* 'nfs-server-stable' of git://linux-nfs.org/~bfields/linux:
knfsd: query filesystem for NFSv4 getattr of FATTR4_MAXNAME
knfsd: nfsv4 delegation recall should take reference on client
knfsd: don't shutdown callbacks until nfsv4 client is freed
knfsd: let nfsd manage timing out its own leases
knfsd: Add source address to sunrpc svc errors
knfsd: 64 bit ino support for NFS server
svcgss: move init code into separate function
knfsd: remove code duplication in nfsd4_setclientid()
nfsd warning fix
knfsd: fix callback rpc cred
knfsd: move nfsv4 slab creation/destruction to module init/exit
knfsd: spawn kernel thread to probe callback channel
knfsd: nfs4 name->id mapping not correctly parsing negative downcall
knfsd: demote some printk()s to dprintk()s
knfsd: cleanup of nfsd4 cmp_* functions
knfsd: delete code made redundant by map_new_errors
nfsd: fix horrible indentation in nfsd_setattr
nfsd: remove unused cache_for_each macro
nfsd: tone down inaccurate dprintk
Jiri Kosina [Mon, 15 Oct 2007 13:17:41 +0000 (15:17 +0200)]
HID: fix HIDIOCGRDESC memory access in hidraw
Fix bogus copying of data into userspace when HIDIOCGRDESC is issued.
HID-transport layer makes sure that dev->hid->rdesc is not larger than
HID_MAX_DESCRIPTOR_SIZE.
Ingo Molnar [Mon, 15 Oct 2007 15:00:20 +0000 (17:00 +0200)]
sched: sync wakeups preempt too
make sure sync wakeups preempt too - the scheduler will not
overschedule as we've got various throttles against that.
As a result, sync wakeups can be used more widely in the kernel
(to signal wakeup affinity between tasks), and no arbitrary
latencies will be introduced either.
Ingo Molnar [Mon, 15 Oct 2007 15:00:19 +0000 (17:00 +0200)]
sched: affine sync wakeups
make sync wakeups affine for cache-cold tasks: if a cache-cold task
is woken up by a sync wakeup then use the opportunity to migrate it
straight away. (the two tasks are 'related' because they communicate)
Laurent Vivier [Mon, 15 Oct 2007 15:00:19 +0000 (17:00 +0200)]
sched: guest CPU accounting: maintain stats in account_system_time()
modify account_system_time() to add cputime to cpustat->guest if we are
running a VCPU. We add this cputime to cpustat->user instead of
cpustat->system because this part of KVM code is in fact user code
although it is executed in the kernel. We duplicate VCPU time between
guest and user to allow an unmodified "top(1)" to display correct value.
A modified "top(1)" is able to display good cpu user time and cpu guest
time by subtracting cpu guest time from cpu user time. Update "gtime" in
task_struct accordingly.
Laurent Vivier [Mon, 15 Oct 2007 15:00:19 +0000 (17:00 +0200)]
sched: guest CPU accounting: add guest-CPU /proc/<pid>/stat fields
like for cpustat, introduce the "gtime" (guest time of the task) and
"cgtime" (guest time of the task children) fields for the
tasks. Modify signal_struct and task_struct.
Modify /proc/<pid>/stat to display these new fields.
Laurent Vivier [Mon, 15 Oct 2007 15:00:19 +0000 (17:00 +0200)]
sched: guest CPU accounting: add guest-CPU /proc/stat field
as recent CPUs introduce a third running state, after "user" and
"system", we need a new field, "guest", in cpustat to store the time
used by the CPU to run virtual CPU. Modify /proc/stat to display this
new field.
Milton Miller [Mon, 15 Oct 2007 15:00:19 +0000 (17:00 +0200)]
sched: domain sysctl fixes: do not crash on allocation failure
Now that we are calling this at runtime, a more relaxed error path is
suggested. If an allocation fails, we just register the partial table,
which will show empty directories.
Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Milton Miller [Mon, 15 Oct 2007 15:00:19 +0000 (17:00 +0200)]
sched: domain sysctl fixes: unregister the sysctl table before domains
Unregister and free the sysctl table before destroying domains, then
rebuild and register after creating the new domains. This prevents the
sysctl table from pointing to freed memory for root to write.
Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Milton Miller [Mon, 15 Oct 2007 15:00:19 +0000 (17:00 +0200)]
sched: domain sysctl fixes: use for_each_online_cpu()
init_sched_domain_sysctl was walking cpus 0-n and referencing per_cpu
variables. If the cpus_possible mask is not contigious this will result
in a crash referencing unallocated data. If the online mask is not
contigious then we would show offline cpus and miss online ones.
Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Arjan van de Ven [Mon, 15 Oct 2007 15:00:19 +0000 (17:00 +0200)]
Make scheduler debug file operations const
In general, struct file_operations are const in the kernel, to not have
false cacheline sharing and to catch bugs at compiletime with accidental
writes to them. The new scheduler code introduces a new non-const one;
fix this up.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Ingo Molnar [Mon, 15 Oct 2007 15:00:18 +0000 (17:00 +0200)]
sched: do not normalize kernel threads via SysRq-N
do not normalize kernel threads via SysRq-N: the migration threads,
softlockup threads, etc. might be essential for the system to
function properly. So only zap user tasks.
Andi Kleen [Mon, 15 Oct 2007 15:00:14 +0000 (17:00 +0200)]
sched: cleanup: refactor common code of sleep_on / wait_for_completion
Refactor common code of sleep_on / wait_for_completion
These functions were largely cut'n'pasted. This moves
the common code into single helpers instead. Advantage
is about 1k less code on x86-64 and 91 lines of code removed.
It adds one function call to the non timeout version of
the functions; i don't expect this to be measurable.
Mike Galbraith [Mon, 15 Oct 2007 15:00:14 +0000 (17:00 +0200)]
sched: prevent wakeup over-scheduling
Prevent wakeup over-scheduling. Once a task has been preempted by a
task of the same or lower priority, it becomes ineligible for repeated
preemption by same until it has been ticked, or slept. Instead, the
task is marked for preemption at the next tick. Tasks of higher
priority still preempt immediately.
Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Dmitry Adamushko [Mon, 15 Oct 2007 15:00:14 +0000 (17:00 +0200)]
sched: fix group scheduling for SCHED_BATCH
The following patch (sched: disable sleeper_fairness on SCHED_BATCH)
seems to break GROUP_SCHED. Although, it may be 'oops'-less due to the
possibility of 'p' being always a valid address.
Gautham R Shenoy [Mon, 15 Oct 2007 15:00:14 +0000 (17:00 +0200)]
sched: fix rt ptracer monopolizing CPU
yield() in wait_task_inactive(), can cause a high priority thread to be
scheduled back in, and there by loop forever while it is waiting for some
lower priority thread which is unfortunately still on the runqueue.
Use schedule_timeout_uninterruptible(1) instead.
Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Credit: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Dhaval Giani [Mon, 15 Oct 2007 15:00:14 +0000 (17:00 +0200)]
sched: group scheduling, sysfs tunables
Add tunables in sysfs to modify a user's cpu share.
A directory is created in sysfs for each new user in the system.
/sys/kernel/uids/<uid>/cpu_share
Reading this file returns the cpu shares granted for the user.
Writing into this file modifies the cpu share for the user. Only an
administrator is allowed to modify a user's cpu share.
Paul E. McKenney [Mon, 15 Oct 2007 15:00:14 +0000 (17:00 +0200)]
sched: export cpu_clock()
export cpu_clock() - the preferred API instead of sched_clock().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Dmitry Adamushko [Mon, 15 Oct 2007 15:00:13 +0000 (17:00 +0200)]
sched: tidy up SCHED_RR
- make timeslices of SCHED_RR tasks constant and not
dependent on task's static_prio [1] ;
- remove obsolete code (timeslice related bits);
- make sched_rr_get_interval() return something more
meaningful [2] for SCHED_OTHER tasks.
[1] according to the following link, it's not compliant with SUSv3
(not sure though, what is the reference for us :-)
http://lkml.org/lkml/2007/3/7/656
[2] the interval is dynamic and can be depicted as follows "should a
task be one of the runnable tasks at this particular moment, it would
expect to run for this interval of time before being re-scheduled by the
scheduler tick".
(i.e. it's more precise if a task is runnable at the moment)
yeah, this seems to require task_rq_lock/unlock() but this is not a hot
path.
Dmitry Adamushko [Mon, 15 Oct 2007 15:00:13 +0000 (17:00 +0200)]
sched: fix __pick_next_entity()
The thing is that __pick_next_entity() must never be called when
first_fair(cfs_rq) == NULL. It wouldn't be a problem, should 'run_node'
be the very first field of 'struct sched_entity' (and it's the second).
The 'nr_running != 0' check is _not_ enough, due to the fact that
'current' is not within the tree. Generic paths are ok (e.g. schedule()
as put_prev_task() is called previously)... I'm more worried about e.g.
migration_call() -> CPU_DEAD_FROZEN -> migrate_dead_tasks()... if
'current' == rq->idle, no problems.. if it's one of the SCHED_NORMAL
tasks (or imagine, some other use-cases in the future -- i.e. we should
not make outer world dependent on internal details of sched_fair class)
-- it may be "Houston, we've got a problem" case.
it's +16 bytes to the ".text". Another variant is to make 'run_node' the
first data member of 'struct sched_entity' but an additional check (se !
= NULL) is still needed in pick_next_entity().
There is a possibility that because of task of a group moving from one
cpu to another, it may gain more cpu time that desired. See
http://marc.info/?l=linux-kernel&m=119073197730334 for details.
This is an attempt to fix that problem. Basically it simulates dequeue
of higher level entities as if they are going to sleep. Similarly it
simulate wakeup of higher level entities as if they are waking up from
sleep.
The adjusting sched_class is a missing part of the already existing "do
not leak PI boosting priority to the child" at the sched_fork(). This
patch moves the adjusting sched_class from wake_up_new_task() to
sched_fork().
this also shrinks the code a bit:
text data bss dec hex filename
40111 4018 292 44421 ad85 sched.o.before
40102 4018 292 44412 ad7c sched.o.after
Ingo Molnar [Mon, 15 Oct 2007 15:00:11 +0000 (17:00 +0200)]
sched: fix sched_fork()
fix sched_fork(): large latencies at new task creation time because
the ->vruntime was not fixed up cross-CPU, if the parent got migrated
after the child's CPU got set up.
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Peter Zijlstra [Mon, 15 Oct 2007 15:00:10 +0000 (17:00 +0200)]
sched debug: check spread
debug feature: check how well we schedule within a reasonable
vruntime 'spread' range. (note that CPU overload can increase
the spread, so this is not a hard condition, but normal loads
should be within the spread.)
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
projects / linux-2.6 / log