From: Andrew Morton <akpm@osdl.org>
To: Chuck Ebbert <76306.1226@compuserve.com>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, torvalds@osdl.org,
ergot86@gmail.com, Ashok Raj <ashok.raj@intel.com>
Subject: Re: [patch 2.6.15] i386: allow disabling X86_FEATURE_SEP at boot
Date: Fri, 27 Jan 2006 14:37:13 -0800 [thread overview]
Message-ID: <20060127143713.2efc16ed.akpm@osdl.org> (raw)
In-Reply-To: <200601261339_MC3-1-B6C3-2E03@compuserve.com>
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?
>
> Documentation/kernel-parameters.txt | 6 +++++-
> arch/i386/kernel/cpu/common.c | 13 +++++++++++++
> 2 files changed, 18 insertions(+), 1 deletion(-)
>
> --- 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.
__devinit is a superset of that, but we're being a little wasteful in the
case of CONFIG_HOTPLUG&&!CONFIG_HOTPLUG_CPU.
next prev parent reply other threads:[~2006-01-27 22:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-26 18:36 Chuck Ebbert
2006-01-27 22:37 ` Andrew Morton [this message]
2006-01-28 6:04 Chuck Ebbert
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