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authorLen Brown <len.brown@intel.com>2011-04-01 15:19:23 -0400
committerLen Brown <len.brown@intel.com>2011-05-29 03:39:15 -0400
commit99c63221435963e0cee2402686ba99293c2ffa9e (patch)
tree7c73900db0eafed36291257494c1e084de6ad034 /Documentation
parent3b70b2e5fcf6315eb833a1bcc2b810bdc75484ff (diff)
x86 idle APM: deprecate CONFIG_APM_CPU_IDLE
We don't want to export the pm_idle function pointer to modules. Currently CONFIG_APM_CPU_IDLE w/ CONFIG_APM_MODULE forces us to. CONFIG_APM_CPU_IDLE is of dubious value, it runs only on 32-bit uniprocessor laptops that are over 10 years old. It calls into the BIOS during idle, and is known to cause a number of machines to fail. Removing CONFIG_APM_CPU_IDLE and will allow us to stop exporting pm_idle. Any systems that were calling into the APM BIOS at run-time will simply use HLT instead. cc: x86@kernel.org cc: Jiri Kosina <jkosina@suse.cz> cc: stable@kernel.org # .39.x Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/feature-removal-schedule.txt10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 5540615ac26..fc505c1b476 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -14,6 +14,16 @@ Who: Len Brown <len.brown@intel.com>
---------------------------
+What: CONFIG_APM_CPU_IDLE, and its ability to call APM BIOS in idle
+When: 2012
+Why: This optional sub-feature of APM is of dubious reliability,
+ and ancient APM laptops are likely better served by calling HLT.
+ Deleting CONFIG_APM_CPU_IDLE allows x86 to stop exporting
+ the pm_idle function pointer to modules.
+Who: Len Brown <len.brown@intel.com>
+
+----------------------------
+
What: PRISM54
When: 2.6.34