linux-kernel - Re: [PATCH 0/5] mm: poison critical mm/ structs

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Message-Id: <20141001144834.ff3ff0349951df734d159fb3@linux-foundation.org>
Date:	Wed, 1 Oct 2014 14:48:34 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, hughd@...gle.com,
	mgorman@...e.de
Subject: Re: [PATCH 0/5] mm: poison critical mm/ structs

On Wed, 01 Oct 2014 17:39:39 -0400 Sasha Levin <sasha.levin@...cle.com> wrote:

> > It looks fairly cheap - I wonder if it should simply fall under
> > CONFIG_DEBUG_VM rather than the new CONFIG_DEBUG_VM_POISON.
> 
> Config options are cheap as well :)

Thing is, lots of people are enabling CONFIG_DEBUG_VM, but a smaller
number of people will enable CONFIG_DEBUG_VM_POISON.  Less coverage. 

Defaulting to y if CONFIG_DEBUG_VM might help, but if people do `make
oldconfig' when CONFIG_DEBUG_VM=n, their CONFIG_DEBUG_VM_POISON will
get set to `n' and will remain that way when they set CONFIG_DEBUG_VM
again.

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