linux-kernel - Re: [tip:x86/urgent] x86/smpboot: Fix announce_cpu() to printk() the last "OK" properly

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Date:	Fri, 27 Sep 2013 15:33:02 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org,
	huawei.libin@...wei.com, wangyijing@...wei.com,
	fenghua.yu@...el.com, tglx@...utronix.de, guohanjun@...wei.com,
	paul.gortmaker@...driver.com, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86/smpboot: Fix announce_cpu() to printk() the
 last "OK" properly


* Borislav Petkov <bp@...en8.de> wrote:

> On Fri, Sep 27, 2013 at 08:51:15AM +0200, Ingo Molnar wrote:
> > That message was cool and interesting back in the days when we wrote
> > lockdep ('hey, look ma, it really works!!'), but there hasn't been
> > any breakage in that area for a long time and it definitely does not
> > deserve one line of log spam per CPU! Especially if it messes up such
> > a nice CPU bootup table.
> 
> Right. The comment in alternatives_enable_smp() talks about older
> binutils and could be a useful info if we encounter the issue again. Should I
> keep it or are we talking really old, i.e.
> 
> obsolete-we-will-never-use-them-anywhere-and-if-someone-does-we-dont-care
> 
> binutils?

See this commit from ~5 years ago:

  17abecfe651c x86: fix up alternatives with lockdep enabled

I was thinking about removing the message back then. Nobody ever 
complained: code patching is so fundamental to a properly functioning 
Linux kernel that broken binutils would stick out like a sore thumb - and 
not just related to lockdep.

So lets remove it.

Thanks,

	Ingo
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