From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1755367AbbFOOem (ORCPT <rfc822;w@1wt.eu>);
	Mon, 15 Jun 2015 10:34:42 -0400
Received: from mail-pd0-f174.google.com ([209.85.192.174]:35335 "EHLO
	mail-pd0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1754130AbbFOOef (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Mon, 15 Jun 2015 10:34:35 -0400
Date: Mon, 15 Jun 2015 23:33:52 +0900
From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>, Tejun Heo <tj@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Amir Vadai <amirv@mellanox.com>, linux-kernel@vger.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Subject: Re: [PATCH resend] cpumask: don't perform while loop in
 cpumask_next_and()
Message-ID: <20150615143352.GB538@swordfish>
References: <1425223323-20180-1-git-send-email-sergey.senozhatsky@gmail.com>
 <20150615131221.GA12596@twins.programming.kicks-ass.net>
 <20150615134008.GA4447@pd.tnic>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20150615134008.GA4447@pd.tnic>
User-Agent: Mutt/1.5.23+89 (0255b37be491) (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On (06/15/15 15:40), Borislav Petkov wrote:
[..]
> 
> That's some fat stack with 8K CPUs:
> 
> cpumask_next_and:
>         pushq   %rbp    #
>         movq    %rsp, %rbp      #,
>         pushq   %rbx    #
>         movl    %edi, %ebx      # n, n
>         leaq    -1040(%rbp), %rdi       #, tmp106
>         subq    $1032, %rsp     #,
> 		^^^^^
> 
> Lovely.
>

Oh, wow, 8K cpus...

No excuse.

	-ss