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| author | Len Brown <len.brown@intel.com> | 2013-02-10 11:28:46 +0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2013-02-10 12:32:22 +0400 |
| commit | 27be457000211a6903968dfce06d5f73f051a217 (patch) | |
| tree | 3c7aa75a0a8dc180944cfecae466f26aa5a8dc29 /Documentation | |
| parent | 69fb3676df3329a7142803bb3502fa59dc0db2e3 (diff) | |
| download | linux-27be457000211a6903968dfce06d5f73f051a217.tar.xz | |
x86 idle: remove 32-bit-only "no-hlt" parameter, hlt_works_ok flag
Remove 32-bit x86 a cmdline param "no-hlt",
and the cpuinfo_x86.hlt_works_ok that it sets.
If a user wants to avoid HLT, then "idle=poll"
is much more useful, as it avoids invocation of HLT
in idle, while "no-hlt" failed to do so.
Indeed, hlt_works_ok was consulted in only 3 places.
First, in /proc/cpuinfo where "hlt_bug yes"
would be printed if and only if the user booted
the system with "no-hlt" -- as there was no other code
to set that flag.
Second, check_hlt() would not invoke halt() if "no-hlt"
were on the cmdline.
Third, it was consulted in stop_this_cpu(), which is invoked
by native_machine_halt()/reboot_interrupt()/smp_stop_nmi_callback() --
all cases where the machine is being shutdown/reset.
The flag was not consulted in the more frequently invoked
play_dead()/hlt_play_dead() used in processor offline and suspend.
Since Linux-3.0 there has been a run-time notice upon "no-hlt" invocations
indicating that it would be removed in 2012.
Signed-off-by: Len Brown <len.brown@intel.com>
Cc: x86@kernel.org
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 3b0cd1e612da..109ee45cf20d 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1881,10 +1881,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted. wfi(ARM) instruction doesn't work correctly and not to use it. This is also useful when using JTAG debugger. - no-hlt [BUGS=X86-32] Tells the kernel that the hlt - instruction doesn't work correctly and not to - use it. - no_file_caps Tells the kernel not to honor file capabilities. The only way then for a file to be executed with privilege is to be setuid root or executed by root. |