Merge 5.4-rc1-prelrease into android-mainline (94139142) · Commits · e / devices / android_kernel_fairphone_FP5

Documentation/ABI/testing/sysfs-class-backlight

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		What: /sys/class/backlight/<backlight>/scale
		Date: July 2019
		KernelVersion: 5.4
		Contact: Daniel Thompson <daniel.thompson@linaro.org>
		Description:
		Description of the scale of the brightness curve.

		The human eye senses brightness approximately logarithmically,
		hence linear changes in brightness are perceived as being
		non-linear. To achieve a linear perception of brightness changes
		controls like sliders need to apply a logarithmic mapping for
		backlights with a linear brightness curve.

		Possible values of the attribute are:

		unknown
		The scale of the brightness curve is unknown.

		linear
		The brightness changes linearly with each step. Brightness
		controls should apply a logarithmic mapping for a linear
		perception.

		non-linear
		The brightness changes non-linearly with each step. Brightness
		controls should use a linear mapping for a linear perception.

+9 −4

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		@@ -429,10 +429,15 @@ KernelVersion: 2.6.22
		Contact: Pekka Enberg <penberg@cs.helsinki.fi>,
		Christoph Lameter <cl@linux-foundation.org>
		Description:
		The shrink file is written when memory should be reclaimed from
		a cache. Empty partial slabs are freed and the partial list is
		sorted so the slabs with the fewest available objects are used
		first.
		The shrink file is used to reclaim unused slab cache
		memory from a cache. Empty per-cpu or partial slabs
		are freed and the partial list is sorted so the slabs
		with the fewest available objects are used first.
		It only accepts a value of "1" on write for shrinking
		the cache. Other input values are considered invalid.
		Shrinking slab caches might be expensive and can
		adversely impact other running applications. So it
		should be used with care.

		What: /sys/kernel/slab/cache/slab_size
		Date: May 2007

+3 −1

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		@@ -85,8 +85,10 @@ Brief summary of control files.
		memory.oom_control set/show oom controls.
		memory.numa_stat show the number of memory usage per numa
		node

		memory.kmem.limit_in_bytes set/show hard limit for kernel memory
		This knob is deprecated and shouldn't be
		used. It is planned that this be removed in
		the foreseeable future.
		memory.kmem.usage_in_bytes show current kernel memory allocation
		memory.kmem.failcnt show the number of kernel memory usage
		hits limits

+5 −2

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		@@ -809,6 +809,8 @@
		enables the feature at boot time. By default, it is
		disabled and the system will work mostly the same as a
		kernel built without CONFIG_DEBUG_PAGEALLOC.
		Note: to get most of debug_pagealloc error reports, it's
		useful to also enable the page_owner functionality.
		on: enable the feature

		debugpat [X86] Enable PAT debugging
		@@ -3465,12 +3467,13 @@
		specify the device is described above.
		If <order of align> is not specified,
		PAGE_SIZE is used as alignment.
		PCI-PCI bridge can be specified, if resource
		A PCI-PCI bridge can be specified if resource
		windows need to be expanded.
		To specify the alignment for several
		instances of a device, the PCI vendor,
		device, subvendor, and subdevice may be
		specified, e.g., 4096@pci:8086:9c22:103c:198f
		specified, e.g., 12@pci:8086:9c22:103c:198f
		for 4096-byte alignment.
		ecrc= Enable/disable PCIe ECRC (transaction layer
		end-to-end CRC checking).
		bios: Use BIOS/firmware settings. This is the

+3 −0

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		@@ -42,6 +42,9 @@ String Manipulation
		.. kernel-doc:: lib/string.c
		:export:

		.. kernel-doc:: include/linux/string.h
		:internal:

		.. kernel-doc:: mm/util.c
		:functions: kstrdup kstrdup_const kstrndup kmemdup kmemdup_nul memdup_user
		vmemdup_user strndup_user memdup_user_nul