linux-kernel - Re: [PATCH v4 2/4] x86: query dynamic DEBUG

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Message-ID: <alpine.DEB.2.10.1602031447430.10331@chino.kir.corp.google.com>
Date:	Wed, 3 Feb 2016 14:48:23 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v4 2/4] x86: query dynamic DEBUG_PAGEALLOC setting

On Wed, 3 Feb 2016, Christian Borntraeger wrote:

> We can use debug_pagealloc_enabled() to check if we can map
> the identity mapping with 2MB pages. We can also add the state
> into the dump_stack output.
> 
> The patch does not touch the code for the 1GB pages, which ignored
> CONFIG_DEBUG_PAGEALLOC. Do we need to fence this as well?
> 

I think it would be an extension of the debug_pagealloc= functionality and 
can certainly be introduced if someone is inclined.

> Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
> Reviewed-by: Thomas Gleixner <tglx@...utronix.de>

Acked-by: David Rientjes <rientjes@...gle.com>