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SubjectRe: [PATCH]x86_64: build and use GDT on copied compressed kernel
Date
"Yinghai Lu" <yhlu.kernel@gmail.com> writes:

> On 5/12/07, Eric W. Biederman <ebiederm@xmission.com> wrote:
>> Overwriting the GDT should be fine because we don't reload the segments,
>> after we overwrite it. GDT entries are only read when we load segments.
>> Interrupts are disabled so that should not cause a problem.
>>
>> Why do you think the current behaviour is a problem?
>
> just think if GDT should not be overwriten when we are still under
> that GDT setting.
> didn't have chance to test that in HDT or other debug device, when
> setting breaking point after that GDT is overwriten.

It would be interesting to see if you could produce a failure using
that gdt, I don't think you will be able to, even with a debugger.

For data segments we never use that GDT, it is only for the code
segment we use the GDT and that only to get us into 64bit mode.

Eric
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