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authorLen Brown <len.brown@intel.com>2011-04-01 15:41:17 -0400
committerLen Brown <len.brown@intel.com>2011-05-29 03:39:16 -0400
commitcdaab4a0d330f70c0e5ad8c3f7c65c2e375ea180 (patch)
treec0737c6c9106f858df5e223b168d548de1c1990e /Documentation
parent99c63221435963e0cee2402686ba99293c2ffa9e (diff)
x86 idle: deprecate "no-hlt" cmdline param
We'd rather that modern machines not check if HLT works on every entry into idle, for the benefit of machines that had marginal electricals 15-years ago. If those machines are still running the upstream kernel, they can use "idle=poll". The only difference will be that they'll now invoke HLT in machine_hlt(). cc: x86@kernel.org # .39.x Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/feature-removal-schedule.txt11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index fc505c1b476..f1b0eb02aa1 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -24,6 +24,17 @@ Who: Len Brown <len.brown@intel.com>
----------------------------
+What: x86_32 "no-hlt" cmdline param
+When: 2012
+Why: remove a branch from idle path, simplify code used by everybody.
+ This option disabled the use of HLT in idle and machine_halt()
+ for hardware that was flakey 15-years ago. Today we have
+ "idle=poll" that removed HLT from idle, and so if such a machine
+ is still running the upstream kernel, "idle=poll" is likely sufficient.
+Who: Len Brown <len.brown@intel.com>
+
+----------------------------
+
What: PRISM54
When: 2.6.34