Revision ea0854170c95245a258b386c7a9314399c949fe0 authored by Shaohui Zheng on 02 February 2010, 21:44:16 UTC, committed by Linus Torvalds on 03 February 2010, 02:11:23 UTC
Newly added memory can not be accessed via /dev/mem, because we do not update the variables high_memory, max_pfn and max_low_pfn. Add a function update_end_of_memory_vars() to update these variables for 64-bit kernels. [akpm@linux-foundation.org: simplify comment] Signed-off-by: Shaohui Zheng <shaohui.zheng@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Li Haicheng <haicheng.li@intel.com> Reviewed-by: Wu Fengguang <fengguang.wu@intel.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent a225a5c
video-output.txt
Video Output Switcher Control
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2006 luming.yu@intel.com
The output sysfs class driver provides an abstract video output layer that
can be used to hook platform specific methods to enable/disable video output
device through common sysfs interface. For example, on my IBM ThinkPad T42
laptop, The ACPI video driver registered its output devices and read/write
method for 'state' with output sysfs class. The user interface under sysfs is:
linux:/sys/class/video_output # tree .
.
|-- CRT0
| |-- device -> ../../../devices/pci0000:00/0000:00:01.0
| |-- state
| |-- subsystem -> ../../../class/video_output
| `-- uevent
|-- DVI0
| |-- device -> ../../../devices/pci0000:00/0000:00:01.0
| |-- state
| |-- subsystem -> ../../../class/video_output
| `-- uevent
|-- LCD0
| |-- device -> ../../../devices/pci0000:00/0000:00:01.0
| |-- state
| |-- subsystem -> ../../../class/video_output
| `-- uevent
`-- TV0
|-- device -> ../../../devices/pci0000:00/0000:00:01.0
|-- state
|-- subsystem -> ../../../class/video_output
`-- uevent
Computing file changes ...
