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

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Date:	Mon, 6 Jul 2015 18:23:59 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Sasha Levin <sasha.levin@...cle.com>
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


* 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?

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.)

Thanks,

	Ingo
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