[lkml]   [2011]   [Mar]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 2/9] x86 idle: remove NOP cpuinfo_x86.hlt_works_ok flag
> > hlt_works_ok was X86_32 only, initialized to 1, and never cleared.
> >
> > On 32-bit kernels, this deletes a line from /proc/cpuinfo: "hlt_bug : no"
> I think you missed the valid usecase where an old CPU with broken halt is
> booted with the no-hlt boot parameter and does not want to crash in the HLT
> instruction.
> That "no-hlt" boot parameter does:
> arch/x86/kernel/cpu/bugs.c: boot_cpu_data.hlt_works_ok = 0;
> We can restrict compatibility, but *please* lets do it *explicitly*, not under
> some 'remove unused code' pretense ...
> Could you please list all CPU models that are affected?

"no-hlt" existed only for 32-bit, and there were exactly zero
automatic invocations of it.

"idle=poll" does the same thing -- sans change a line
in /proc/cpuinfo.

Do we really need both?


 \ /
  Last update: 2011-03-31 09:05    [W:0.110 / U:4.160 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site