linux-kernel - Re: [PATCH 8/8] x86: add comments about various syscall instructions, no code changes

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Date:	Fri, 08 Aug 2014 18:18:37 +0200
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...capital.net>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 8/8] x86: add comments about various syscall instructions,
 no code changes

On 08/05/2014 09:58 PM, Oleg Nesterov wrote:
> On 08/05, Denys Vlasenko wrote:
>>
>> This patch adds comments which explain in detail
>> what registers are modified by each of these instructions.
>> The comments are placed immediately before corresponding
>> entry and exit points.
> 
> This is great ;)

I just discovered that I misunderstood how _exactly_
SYSCALL decides whether to save rflags to r11 or not.

(Wrote an actual testcase for 32bit -> 64bit SYSCALL
transition. Practice always trumps theory, doesn't it? ;)

So I had to fix my comments in this patch. I guess
I need to send v4 of the patchset now...

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