Re: [Patch BUGFIX] kcore: fix its wrong size on x86_64

From: Eric W. Biederman
Date: Wed Jun 17 2009 - 23:37:53 EST

Amerigo Wang <xiyou.wangcong@xxxxxxxxx> writes:

> On Tue, Jun 16, 2009 at 12:27:36PM -0700, Eric W. Biederman wrote:
>>AmÃrico Wang <xiyou.wangcong@xxxxxxxxx> writes:
>>>> I think a case can be made either way. ÂIn practice neither answer
>>>> gives us a dense offset space on x86_64 so I think I prefer the
>>>> current definition which sets or clears the high bits as opposed
>>>> to something that mangles the address more.
>>> I am trying to dig more... There must be something wrong there.
>>How so?
> See what you will get for kc_vaddr_to_offset(__va(0))?
> It is supposed to be 0.

I see: 0x0000880000001000 That extra 0x1000 looks suspicous.

It MUST NOT be 0. That is where the ELF header lives in the file.

> Yes, I am cooking a patch set... will send them when ready.

The I will leave it to you.


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