linux-stable.git/include/linux/cpufreq.h, branch v4.11.2

cpufreq: Fix typos in comments

2017-02-03T23:47:59+00:00

- s/freqnency/frequency/
- s/accomodating/accommodating/

Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

cpufreq: Remove CPUFREQ_START notifier event

2017-02-03T23:05:30+00:00

Its not used anymore, remove it.

Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

cpufreq: Remove policy create/remove notifiers

2017-02-03T22:59:38+00:00

Those were added by:

commit fcd7af917abb ("cpufreq: stats: handle cpufreq_unregister_driver()
and suspend/resume properly")

but aren't used anymore since:

commit 1aefc75b2449 ("cpufreq: stats: Make the stats code non-modular").

Remove them. Also remove the redundant parameter to the respective
routines.

Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

cpufreq: Make cpufreq_update_policy() void

2016-11-21T13:35:43+00:00

The return value of cpufreq_update_policy() is never used, so make
it void.

Signed-off-by: Rafael J. Wysocki 
Acked-by: Viresh Kumar

cpufreq: stats: New sysfs attribute for clearing statistics

2016-11-11T00:51:11+00:00

Allow CPUfreq statistics to be cleared by writing anything to
/sys/.../cpufreq/stats/reset.

Signed-off-by: Markus Mayer 
Acked-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

cpufreq: fix overflow in cpufreq_table_find_index_dl()

2016-10-20T14:35:50+00:00

'best' is always less or equals to 'pos', so `best - pos' returns
a negative value which is then getting casted to `unsigned int'
and passed to __cpufreq_driver_target()->acpi_cpufreq_target()
for policy->freq_table selection. This results in

 BUG: unable to handle kernel paging request at ffff881019b469f8
 IP: [] acpi_cpufreq_target+0x4f/0x190 [acpi_cpufreq]
 PGD 267f067
 PUD 0

 Oops: 0000 [#1] PREEMPT SMP
 CPU: 6 PID: 70 Comm: kworker/6:1 Not tainted 4.9.0-rc1-next-20161017-dbg-dirty
 Workqueue: events dbs_work_handler
 task: ffff88041b808000 task.stack: ffff88041b810000
 RIP: 0010:[]  [] acpi_cpufreq_target+0x4f/0x190 [acpi_cpufreq]
 RSP: 0018:ffff88041b813c60  EFLAGS: 00010282
 RAX: ffff880419b46a00 RBX: ffff88041b848400 RCX: ffff880419b20f80
 RDX: 00000000001dff38 RSI: 00000000ffffffff RDI: ffff88041b848400
 RBP: ffff88041b813cb0 R08: 0000000000000006 R09: 0000000000000040
 R10: ffffffff8207f9e0 R11: ffffffff8173595b R12: 0000000000000000
 R13: ffff88041f1dff38 R14: 0000000000262900 R15: 0000000bfffffff4
 FS:  0000000000000000(0000) GS:ffff88041f000000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: ffff881019b469f8 CR3: 000000041a2d3000 CR4: 00000000001406e0
 Stack:
  ffff88041b813cb0 ffffffff813347f9 ffff88041b813ca0 ffffffff81334663
  ffff88041f1d4bc0 ffff88041b848400 0000000000000000 0000000000000000
  0000000000262900 0000000000000000 ffff88041b813d00 ffffffff813355dc
 Call Trace:
  [] ? cpufreq_freq_transition_begin+0xf1/0xfc
  [] ? get_cpu_idle_time+0x97/0xa6
  [] __cpufreq_driver_target+0x3b6/0x44e
  [] cs_dbs_timer+0x11a/0x135
  [] dbs_work_handler+0x39/0x62
  [] process_one_work+0x280/0x4a5
  [] worker_thread+0x24f/0x397
  [] ? rescuer_thread+0x30b/0x30b
  [] ? nl80211_get_key+0x29/0x36a
  [] kthread+0xfc/0x104
  [] ? put_lock_stats.isra.9+0xe/0x20
  [] ? kthread_create_on_node+0x3f/0x3f
  [] ret_from_fork+0x22/0x30
 Code: 56 4d 6b ff 0c 41 55 41 54 53 48 83 ec 28 48 8b 15 ad 1e 00 00 44 8b 41
 08 48 8b 87 c8 00 00 00 49 89 d5 4e 03 2c c5 80 b2 78 81 <46> 8b 74 38 04 45
 3b 75 00 75 11 31 c0 83 39 00 0f 84 1c 01 00
 RIP  [] acpi_cpufreq_target+0x4f/0x190 [acpi_cpufreq]
  RSP 
 CR2: ffff881019b469f8
 ---[ end trace 16d9fc7a17897d37 ]---

[ rjw: In some cases this bug may also cause incorrect frequencies to
  be selected by cpufreq governors. ]

Fixes: 899bb6642f2a (cpufreq: skip invalid entries when searching the frequency)
Link: http://marc.info/?l=linux-kernel&m=147672030714331&w=2
Reported-and-tested-by: Sedat Dilek 
Reported-and-tested-by: Jörg Otte 
Signed-off-by: Sergey Senozhatsky 
Acked-by: Viresh Kumar 
Cc: 4.8+  # 4.8+
Signed-off-by: Rafael J. Wysocki

cpufreq: skip invalid entries when searching the frequency

2016-10-12T19:01:18+00:00

Skip invalid entries when searching the frequency. This fixes cpufreq
at least on loongson2 MIPS board.

Fixes: da0c6dc00c69 (cpufreq: Handle sorted frequency tables more efficiently)
Signed-off-by: Aaro Koskinen 
Signed-off-by: Viresh Kumar 
Cc: 4.8+  # 4.8+
Signed-off-by: Rafael J. Wysocki

cpufreq: add cpufreq_driver_resolve_freq()

2016-07-21T12:46:08+00:00

Cpufreq governors may need to know what a particular target frequency
maps to in the driver without necessarily wanting to set the frequency.
Support this operation via a new cpufreq API,
cpufreq_driver_resolve_freq(). This API returns the lowest driver
frequency equal or greater than the target frequency
(CPUFREQ_RELATION_L), subject to any policy (min/max) or driver
limitations. The mapping is also cached in the policy so that a
subsequent fast_switch operation can avoid repeating the same lookup.

The API will call a new cpufreq driver callback, resolve_freq(), if it
has been registered by the driver. Otherwise the frequency is resolved
via cpufreq_frequency_table_target(). Rather than require ->target()
style drivers to provide a resolve_freq() callback it is left to the
caller to ensure that the driver implements this callback if necessary
to use cpufreq_driver_resolve_freq().

Suggested-by: Rafael J. Wysocki 
Signed-off-by: Steve Muckle 
Signed-off-by: Rafael J. Wysocki

cpufreq: Handle sorted frequency tables more efficiently

2016-07-06T22:13:20+00:00

cpufreq drivers aren't required to provide a sorted frequency table
today, and even the ones which provide a sorted table aren't handled
efficiently by cpufreq core.

This patch adds infrastructure to verify if the freq-table provided by
the drivers is sorted or not, and use efficient helpers if they are
sorted.

Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

cpufreq: Return index from cpufreq_frequency_table_target()

2016-06-08T22:58:06+00:00

This routine can't fail unless the frequency table is invalid and
doesn't contain any valid entries.

Make it return the index and WARN() in case it is used for an invalid
table.

Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki