linux-kernel - Re: [PATCHv2 1/4] x86_64: cleanup THREAD

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Date:	Wed, 21 Jan 2015 14:40:39 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Alexander van Heukelum <heukelum@...tmail.fm>
Cc:	Andy Lutomirski <luto@...capital.net>, X86 ML <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>, Borislav Petkov <bp@...e.de>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCHv2 1/4] x86_64: cleanup THREAD_INFO(reg,offset) macro

On Sun, Jan 18, 2015 at 12:45 PM, Alexander van Heukelum
<heukelum@...tmail.fm> wrote:
> The macro THREAD_INFO(reg,offset) is used in assembly to compute the
> offset between the user ptregs and the thread_info struct. Change
> the macro and all its uses so that offset is given as the current
> top of stack in the pt_regs frame. The generated code is identical.

What is the purpose of doing this?

I don't mean to say that it's pointless, but it is also not obvious
why it's better than the code before patch.
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