linux-kernel - Re: [PATCH] x86: Use v8086_mode helper, trivial unification

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Date:	Thu, 17 Jan 2008 17:37:12 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Harvey Harrison <harvey.harrison@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86: Use v8086_mode helper, trivial unification

It's indeed true that &pt_regs is truly the esp value for x86-32
kernel-mode trap frames.  Because this nonobvious calculation is 
only right for a kernel mode pt_regs and not for a user-mode one,
I think it would be better to use a name for the inline/macro that
makes this quite clear, rather than one so generic as "stack_addr".

> I think this comes out of Roland's patches unifying some names eip/rip,
> eax/rax, etc.
> 
> CC'd in case he felt like more work ;-)

That was hpa, not me.  Harmonizing the signedness of the struct members
does seem to me like a reasonable and deobfuscatory thing to do.
But I don't plan to get involved in doing it.

Thanks,
Roland
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