linux-kernel - Re: [PATCH] x86/asm/entry/64: Clean up entry

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Date:	Mon, 06 Jul 2015 12:36:31 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Denys Vlasenko <dvlasenk@...hat.com>, linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Brian Gerst <brgerst@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86/asm/entry/64: Clean up entry_64.S

On 07/06/2015 12:23 PM, Ingo Molnar wrote:
> 
> * Sasha Levin <sasha.levin@...cle.com> wrote:
> 
>> On 07/06/2015 12:07 PM, Ingo Molnar wrote:
>>>
>>> * Sasha Levin <sasha.levin@...cle.com> wrote:
>>>
>>>> Hey Ingo,
>>>>
>>>> I've started seeing the fuzzer hitting the BUG() at arch/x86/kernel/nmi.c:533. git
>>>> blame pointed to this patch. I know that you didn't see any changes in the compiled
>>>> file in your testcase, but I do see changes in mine.
>>>
>>> Hm, weird - could you send me your .config please?
>>
>> Attached.
> 
> It's still weird: I copied your config to 4d7321381e5c and made 'make oldconfig' - 
> and it asked a couple of questions, which suggests that your config does not come 
> from 4d7321381e5c?

Right, sorry, this is my base config for -next. I just did 'yes "" | make oldconfig'
for the build test.

I've attached it.

> Furthermore, building 4d7321381e5c and 4d7321381e5c^1 gives me:
> 
>   # arch/x86/entry/entry_64.o:
> 
>    text    data     bss     dec     hex filename
>   11530       0       0   11530    2d0a entry_64.o.before
>   11530       0       0   11530    2d0a entry_64.o.after
> 
> md5:
>    1430e793250d5d8572bc2df2997d3929  entry_64.o.before.asm
>    1430e793250d5d8572bc2df2997d3929  entry_64.o.after.asm
> 
> i.e. I have trouble reproducing the discrepancy you are seeing. (I also tried 
> allmodconfig/allyesconfig again for good measure - no luck.)

With allyesconfig I don't actually see a change. Only with the config I've attached.


Thanks,
Sasha


View attachment "config-sasha" of type "text/plain" (161255 bytes)