| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 9 Jan 2008 12:12:24 -0800 From: David Brownell <david-b@...bell.net> To: Andrew Morton <akpm@...ux-foundation.org> Cc: linux-pm@...ts.linux-foundation.org, Linux Kernel list <linux-kernel@...r.kernel.org> Subject: [patch 2.6.24-rc7] remove obsolete /sys/devices/.../power/state docs The /sys/devices/.../power/state files have been gone for a while now, but I just noticed some documentation that still refers to them. (Fortunately described as DEPRECATED and WILL REMOVE). Time to remove that obsolete documentation too ... Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net> --- Documentation/power/devices.txt | 49 ---------------------------------------- 1 file changed, 49 deletions(-) --- g26.orig/Documentation/power/devices.txt 2008-01-09 12:05:51.000000000 -0800 +++ g26/Documentation/power/devices.txt 2008-01-09 12:06:33.000000000 -0800 @@ -502,52 +502,3 @@ If the CPU can have a "cpufreq" driver, to shift to lower voltage settings and reduce the power cost of executing a given number of instructions. (Without voltage adjustment, it's rare for cpufreq to save much power; the cost-per-instruction must go down.) - - -/sys/devices/.../power/state files -================================== -For now you can also test some of this functionality using sysfs. - - DEPRECATED: USE "power/state" ONLY FOR DRIVER TESTING, AND - AVOID USING dev->power.power_state IN DRIVERS. - - THESE WILL BE REMOVED. IF THE "power/state" FILE GETS REPLACED, - IT WILL BECOME SOMETHING COUPLED TO THE BUS OR DRIVER. - -In each device's directory, there is a 'power' directory, which contains -at least a 'state' file. The value of this field is effectively boolean, -PM_EVENT_ON or PM_EVENT_SUSPEND. - - * Reading from this file displays a value corresponding to - the power.power_state.event field. All nonzero values are - displayed as "2", corresponding to a low power state; zero - is displayed as "0", corresponding to normal operation. - - * Writing to this file initiates a transition using the - specified event code number; only '0', '2', and '3' are - accepted (without a newline); '2' and '3' are both - mapped to PM_EVENT_SUSPEND. - -On writes, the PM core relies on that recorded event code and the device/bus -capabilities to determine whether it uses a partial suspend() or resume() -sequence to change things so that the recorded event corresponds to the -numeric parameter. - - - If the bus requires the irqs-disabled suspend_late()/resume_early() - phases, writes fail because those operations are not supported here. - - - If the recorded value is the expected value, nothing is done. - - - If the recorded value is nonzero, the device is partially resumed, - using the bus.resume() and/or class.resume() methods. - - - If the target value is nonzero, the device is partially suspended, - using the class.suspend() and/or bus.suspend() methods and the - PM_EVENT_SUSPEND message. - -Drivers have no way to tell whether their suspend() and resume() calls -have come through the sysfs power/state file or as part of entering a -system sleep state, except that when accessed through sysfs the normal -parent/child sequencing rules are ignored. Drivers (such as bus, bridge, -or hub drivers) which expose child devices may need to enforce those rules -on their own. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists