linux-toradex.git/include/linux/math64.h, branch v6.6-rc5

math64: Always inline u128 version of mul_u64_u64_shr()

2023-06-05T19:11:06+00:00

In order to prevent the following complaint from happening, always
inline the u128 variant of mul_u64_u64_shr() -- which is what x86_64
will use.

  vmlinux.o: warning: objtool: read_hv_sched_clock_tsc+0x5a: call to mul_u64_u64_shr.constprop.0() leaves .noinstr.text section

It should compile into something like:

  asm("mul	%[mul];"
      "shrd	%rdx, %rax, %cl"
      : "+&a" (a)
      : "c" shift, [mul] "r" (mul)
      : "d");

Which is silly not to inline, but it happens.

Signed-off-by: Peter Zijlstra (Intel) 
Tested-by: Michael Kelley   # Hyper-V
Link: https://lore.kernel.org/r/20230519102715.637420396@infradead.org

sched/clock/x86: Mark sched_clock() noinstr

2023-01-31T14:01:47+00:00

In order to use sched_clock() from noinstr code, mark it and all it's
implenentations noinstr.

The whole pvclock thing (used by KVM/Xen) is a bit of a pain,
since it calls out to watchdogs, create a
pvclock_clocksource_read_nowd() variant doesn't do that and can be
noinstr.

Signed-off-by: Peter Zijlstra (Intel) 
Signed-off-by: Ingo Molnar 
Link: https://lore.kernel.org/r/20230126151323.702003578@infradead.org

math64: fix kernel-doc return value warnings

2022-11-21T21:30:54+00:00

Fix the following kernel-doc warnings by adding a description for return
values of div_[us]64.

	math64.h:126: warning: No description found for return value of 'div_u64'
	math64.h:139: warning: No description found for return value of 'div_s64'

Signed-off-by: Liam Beguin 
Link: https://lore.kernel.org/r/20221118182309.3824530-3-liambeguin@gmail.com
Signed-off-by: Jonathan Corbet

math64: add kernel-doc for DIV64_U64_ROUND_UP

2022-11-21T21:30:54+00:00

Add kernel-doc for DIV64_U64_ROUND_UP so that it appears in the
documentation.

Signed-off-by: Liam Beguin 
Acked-by: Randy Dunlap 
Tested-by: Randy Dunlap 
Link: https://lore.kernel.org/r/20221118182309.3824530-2-liambeguin@gmail.com
Signed-off-by: Jonathan Corbet

math64: favor kernel-doc from header files

2022-11-21T21:30:53+00:00

Fix the kernel-doc markings for div64 functions to point to the header
file instead of the lib/ directory.  This avoids having implementation
specific comments in generic documentation.  Furthermore, given that
some kernel-doc comments are identical, drop them from lib/math64 and
only keep there comments that add implementation details.

Signed-off-by: Liam Beguin 
Acked-by: Randy Dunlap 
Tested-by: Randy Dunlap 
Link: https://lore.kernel.org/r/20221118182309.3824530-1-liambeguin@gmail.com
Signed-off-by: Jonathan Corbet

math64: New DIV_U64_ROUND_CLOSEST helper

2022-02-25T09:27:57+00:00

Provide DIV_U64_ROUND_CLOSEST helper which uses div_u64 to perform
division rounded to the closest integer using unsigned 64bit
dividend and unsigned 32bit divisor.

Reviewed-by: Marek Behún 
Signed-off-by: Pali Rohár 
Signed-off-by: Marek Behún 
Link: https://lore.kernel.org/r/20220219152818.4319-2-kabel@kernel.org
Signed-off-by: Greg Kroah-Hartman

math64.h: Add mul_s64_u64_shr()

2021-06-17T17:09:27+00:00

This function is needed for KVM's nested virtualization. The nested TSC
scaling implementation requires multiplying the signed TSC offset with
the unsigned TSC multiplier.

Signed-off-by: Ilias Stamatis 
Reviewed-by: Maxim Levitsky 
Message-Id: <20210526184418.28881-2-ilstam@amazon.com>
Signed-off-by: Paolo Bonzini

math64.h: kernel-docs: Convert some markups into normal comments

2020-10-15T05:49:46+00:00

There are several functions at math64.h that are also
defined at div64.c. As both are included at kernel-api.rst,
Sphinx 3.x complains about symbol duplication:

	./lib/math/div64.c:73: WARNING: Duplicate C declaration, also defined in 'core-api/kernel-api'.
	Declaration is 'div_s64_rem'.
	./lib/math/div64.c:104: WARNING: Duplicate C declaration, also defined in 'core-api/kernel-api'.
	Declaration is 'div64_u64_rem'.
	./lib/math/div64.c:144: WARNING: Duplicate C declaration, also defined in 'core-api/kernel-api'.
	Declaration is 'div64_u64'.
	./lib/math/div64.c:172: WARNING: Duplicate C declaration, also defined in 'core-api/kernel-api'.
	Declaration is 'div64_s64'.

In order to avoid Sphinx warnings about duplication, change the kernel-doc
markups to just comments at math64.h.

Reviewed-by: Vincenzo Frascino 
Signed-off-by: Mauro Carvalho Chehab

Merge tag 'for-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply

2020-08-08T04:27:37+00:00

Pull power supply and reset updates from Sebastian Reichel:
 "Power-supply core:
   - add COOL/WARM/HOT state from JEITA JISC8712:2015 specification
   - convert simple-battery DT binding to YAML
   - add long-life charging mode

 Battery/charger drivers:
   - bq25150: new charger driver
   - bq27xxx: add support for BQ27z561 and BQ28z610
   - max17040: support CAPACITY_ALERT_MIN
   - sbs-battery: add PEC support
   - wilco-ec: support long-life charging mode
   - bq25890: fix DT binding
   - misc. fixes and cleanups

 Reset drivers:
   - linkstation: new reset driver"

* tag 'for-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply: (32 commits)
  power: supply: wilco_ec: Add long life charging mode
  power: supply: bq27xxx_battery: Add the BQ28z610 Battery monitor
  dt-bindings: power: Add BQ28z610 compatible
  power: supply: bq27xxx_battery: Add the BQ27Z561 Battery monitor
  dt-bindings: power: Add BQ27Z561 compatible
  power: supply: test_power: Fix battery_current initial value
  power: supply: Fix kerneldoc of power_supply_temp2resist_simple()
  power: supply: cpcap-battery: Fix kerneldoc of cpcap_battery_read_accumulated()
  dt-bindings: power: Convert battery.txt to battery.yaml
  power: supply: rt5033_battery: Fix error code in rt5033_battery_probe()
  power: supply: max17040: Add POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN
  power: supply: check if calc_soc succeeded in pm860x_init_battery
  power: supply: bq2xxxx: Replace HTTP links with HTTPS ones
  power: reset: add driver for LinkStation power off
  power: supply: sc27xx: prevent adc * 1000 from overflow
  math64: New DIV_S64_ROUND_CLOSEST helper
  power: fix duplicated words in bq2415x_charger.h
  power: Convert to DEFINE_SHOW_ATTRIBUTE
  power: reset: keystone-reset: Replace HTTP links with HTTPS ones
  power: supply: bq25150 introduce the bq25150
  ...

math64: New DIV_S64_ROUND_CLOSEST helper

2020-07-27T22:47:18+00:00

Provide DIV_S64_ROUND_CLOSEST helper which uses div_s64 to perform
division rounded to the closest integer using signed 64bit
dividend and signed 32bit divisor.

Signed-off-by: Chunyan Zhang 
Signed-off-by: Sebastian Reichel