linux.git/drivers/cpufreq, branch v2.6.39

Fix common misspellings

2011-03-31T14:26:23+00:00

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi

cpufreq: Use syscore_ops for boot CPU suspend/resume (v2)

2011-03-23T21:16:32+00:00

The cpufreq subsystem uses sysdev suspend and resume for
executing cpufreq_suspend() and cpufreq_resume(), respectively,
during system suspend, after interrupts have been switched off on the
boot CPU, and during system resume, while interrupts are still off on
the boot CPU.  In both cases the other CPUs are off-line at the
relevant point (either they have been switched off via CPU hotplug
during suspend, or they haven't been switched on yet during resume).
For this reason, although it may seem that cpufreq_suspend() and
cpufreq_resume() are executed for all CPUs in the system, they are
only called for the boot CPU in fact, which is quite confusing.

To remove the confusion and to prepare for elimiating sysdev
suspend and resume operations from the kernel enirely, convernt
cpufreq to using a struct syscore_ops object for the boot CPU
suspend and resume and rename the callbacks so that their names
reflect their purpose.  In addition, put some explanatory remarks
into their kerneldoc comments.

Signed-off-by: Rafael J. Wysocki

[CPUFREQ] Remove the pm_message_t argument from driver suspend

2011-03-16T21:54:33+00:00

None of the existing cpufreq drivers uses the second argument of
its .suspend() callback (which isn't useful anyway), so remove it.

Signed-off-by: Rafael J. Wysocki 
Signed-off-by: Dave Jones

[CPUFREQ] Remove unneeded locks

2011-03-16T21:54:32+00:00

There cannot be any concurrent access to these through
different cpu sysfs files anymore, because these tunables
are now all global (not per cpu).

I still have some doubts whether some of these locks
were needed at all. Anyway, let's get rid of them.

Signed-off-by: Thomas Renninger 
Signed-off-by: Dave Jones 
CC: cpufreq@vger.kernel.org

[CPUFREQ] Remove old, deprecated per cpu ondemand/conservative sysfs files

2011-03-16T21:54:32+00:00

Marked deprecated for quite a whilte now...

Signed-off-by: Thomas Renninger 
Signed-off-by: Dave Jones 
CC: cpufreq@vger.kernel.org

[CPUFREQ] Remove deprecated sysfs file sampling_rate_max

2011-03-16T21:54:32+00:00

Marked deprecated for quite a while now...

Signed-off-by: Thomas Renninger 
Signed-off-by: Dave Jones 
CC: cpufreq@vger.kernel.org

[CPUFREQ] calculate delay after dbs_check_cpu

2011-03-16T21:54:31+00:00

calculate ondemand delay after dbs_check_cpu call because it can
modify rate_mult value

use freq_lo_jiffies value for the sub sample period of powersave_bias mode

Signed-off-by: Vincent Guittot 
Signed-off-by: Dave Jones

[CPUFREQ] drivers/cpufreq: Remove unnecessary semicolons

2011-03-16T21:54:31+00:00

Signed-off-by: Joe Perches 
Signed-off-by: Dave Jones

Merge branch 'for-2.6.39' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

2011-03-16T15:20:19+00:00

* 'for-2.6.39' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: fix build failure introduced by s/freezeable/freezable/
  workqueue: add system_freezeable_wq
  rds/ib: use system_wq instead of rds_ib_fmr_wq
  net/9p: replace p9_poll_task with a work
  net/9p: use system_wq instead of p9_mux_wq
  xfs: convert to alloc_workqueue()
  reiserfs: make commit_wq use the default concurrency level
  ocfs2: use system_wq instead of ocfs2_quota_wq
  ext4: convert to alloc_workqueue()
  scsi/scsi_tgt_lib: scsi_tgtd isn't used in memory reclaim path
  scsi/be2iscsi,qla2xxx: convert to alloc_workqueue()
  misc/iwmc3200top: use system_wq instead of dedicated workqueues
  i2o: use alloc_workqueue() instead of create_workqueue()
  acpi: kacpi*_wq don't need WQ_MEM_RECLAIM
  fs/aio: aio_wq isn't used in memory reclaim path
  input/tps6507x-ts: use system_wq instead of dedicated workqueue
  cpufreq: use system_wq instead of dedicated workqueues
  wireless/ipw2x00: use system_wq instead of dedicated workqueues
  arm/omap: use system_wq in mailbox
  workqueue: use WQ_MEM_RECLAIM instead of WQ_RESCUER

[CPUFREQ] fix BUG on cpufreq policy init failure

2011-03-01T23:49:44+00:00

cpufreq_register_driver sets cpufreq_driver to a structure owned (and
placed) in the caller's memory. If cpufreq policy fails in its ->init
function, sysdev_driver_register returns nonzero in
cpufreq_register_driver. Now, cpufreq_register_driver returns an error
without setting cpufreq_driver back to NULL.

Usually cpufreq policy modules are unloaded because they propagate the
error to the module init function and return that.

So a later access to any member of cpufreq_driver causes bugs like:
BUG: unable to handle kernel paging request at ffffffffa00270a0
IP: [] cpufreq_cpu_get+0x53/0xe0
PGD 1805067 PUD 1809063 PMD 1c3f90067 PTE 0
Oops: 0000 [#1] SMP
last sysfs file: /sys/devices/virtual/net/tun0/statistics/collisions
CPU 0
Modules linked in: ...
Pid: 5677, comm: thunderbird-bin Tainted: G        W   2.6.38-rc4-mm1_64+ #1389 To be filled by O.E.M./To Be Filled By O.E.M.
RIP: 0010:[]  [] cpufreq_cpu_get+0x53/0xe0
RSP: 0018:ffff8801aec37d98  EFLAGS: 00010086
RAX: 0000000000000202 RBX: 0000000000000000 RCX: 0000000000000001
RDX: ffffffffa00270a0 RSI: 0000000000001000 RDI: ffffffff8199ece8
...
Call Trace:
 [] cpufreq_quick_get+0x10/0x30
 [] show_cpuinfo+0x2ab/0x300
 [] seq_read+0xf2/0x3f0
 [] ? __strncpy_from_user+0x33/0x60
 [] proc_reg_read+0x6d/0xa0
 [] vfs_read+0xc3/0x180
 [] sys_read+0x4c/0x90
 [] system_call_fastpath+0x16/0x1b
...

It's all cause by weird fail path handling in cpufreq_register_driver.
To fix that, shuffle the code to do proper handling with gotos.

Signed-off-by: Jiri Slaby 
Signed-off-by: Dave Jones