Messages in this thread | | | Date | Sat, 28 Jan 2006 01:04:16 -0500 | From | Chuck Ebbert <> | Subject | Re: [patch 2.6.15] i386: allow disabling X86_FEATURE_SEP at boot |
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In-Reply-To: <20060127143713.2efc16ed.akpm@osdl.org>
On Fri, 27 Jan 2006 at 14:37:13 -0800, Andrew Morton wrote:
> Chuck Ebbert <76306.1226@compuserve.com> wrote: > > > > Allow the x86 "sep" feature to be disabled at bootup. This > > forces use of the int80 vsyscall. > > > > Why is there a need to do this?
Mainly for testing or benchmarking the int80 vsyscall code.
> > --- 2.6.15a.orig/arch/i386/kernel/cpu/common.c > > +++ 2.6.15a/arch/i386/kernel/cpu/common.c > > @@ -27,6 +27,7 @@ EXPORT_PER_CPU_SYMBOL(cpu_16bit_stack); > > static int cachesize_override __devinitdata = -1; > > static int disable_x86_fxsr __devinitdata = 0; > > static int disable_x86_serial_nr __devinitdata = 1; > > +static int disable_x86_sep __devinitdata = 0; > > > > hm, I guess lots of things in there should be __cpuinit/__cpuinitdata.
I'll try to do that.
> __devinit is a superset of that, but we're being a little wasteful in the > case of CONFIG_HOTPLUG&&!CONFIG_HOTPLUG_CPU.
-- Chuck
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