linux-kernel - Re: [Patch v4] Do not reserve crashkernel high memory if crashkernel low memory reserving failed

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Message-Id: <20150922170850.d46e58d9.akpm@linux-foundation.org>
Date:	Tue, 22 Sep 2015 17:08:50 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Baoquan He <bhe@...hat.com>
Cc:	yinghai@...nel.org, dyoung@...hat.com, jroedel@...e.de,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, bp@...e.de,
	linux-kernel@...r.kernel.org
Subject: Re: [Patch v4] Do not reserve crashkernel high memory if
 crashkernel low memory reserving failed

On Wed, 23 Sep 2015 08:02:55 +0800 Baoquan He <bhe@...hat.com> wrote:

> > 
> > >  	}
> > >  
> > >  	low_base = memblock_find_in_range(low_size, (1ULL<<32),
> > >  					low_size, alignment);
> > >  
> > >  	if (!low_base) {
> > > -		if (!auto_set)
> > > -			pr_info("crashkernel low reservation failed - No suitable area found.\n");
> > > -
> > > -		return;
> > > +		pr_info("crashkernel low reservation failed - No suitable area found.\n");
> > 
> > That's not a terribly useful message.  If kdump is now unavailable and
> > the operator needs to take some remedial action then we should inform
> > them of this.
> > 
> > Also, such a message should have higher severity than KERN_INFO?
> 
> Yes, how about KERN_ERR? It's an unexpected result from kdump side
> though it doesn't harm the normal kernel.

Sure, KERN_ERR is good.  Along with more useful message text.
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