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@@ -6,6 +6,42 @@ be removed from this file.
6 6
7--------------------------- 7---------------------------
8 8
9What: x86 floppy disable_hlt
10When: 2012
11Why: ancient workaround of dubious utility clutters the
12 code used by everybody else.
13Who: Len Brown <len.brown@intel.com>
14
15---------------------------
16
17What: CONFIG_APM_CPU_IDLE, and its ability to call APM BIOS in idle
18When: 2012
19Why: This optional sub-feature of APM is of dubious reliability,
20 and ancient APM laptops are likely better served by calling HLT.
21 Deleting CONFIG_APM_CPU_IDLE allows x86 to stop exporting
22 the pm_idle function pointer to modules.
23Who: Len Brown <len.brown@intel.com>
24
25----------------------------
26
27What: x86_32 "no-hlt" cmdline param
28When: 2012
29Why: remove a branch from idle path, simplify code used by everybody.
30 This option disabled the use of HLT in idle and machine_halt()
31 for hardware that was flakey 15-years ago. Today we have
32 "idle=poll" that removed HLT from idle, and so if such a machine
33 is still running the upstream kernel, "idle=poll" is likely sufficient.
34Who: Len Brown <len.brown@intel.com>
35
36----------------------------
37
38What: x86 "idle=mwait" cmdline param
39When: 2012
40Why: simplify x86 idle code
41Who: Len Brown <len.brown@intel.com>
42
43----------------------------
44
9What: PRISM54 45What: PRISM54
10When: 2.6.34 46When: 2.6.34
11 47