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authorLen Brown <len.brown@intel.com>2013-02-10 08:28:46 +0100
committerLen Brown <len.brown@intel.com>2013-02-10 09:32:22 +0100
commit27be457000211a6903968dfce06d5f73f051a217 (patch)
tree3c7aa75a0a8dc180944cfecae466f26aa5a8dc29 /include/scsi
parentx86 idle: remove mwait_idle() and "idle=mwait" cmdline param (diff)
downloadlinux-27be457000211a6903968dfce06d5f73f051a217.tar.xz
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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
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