linux-kernel - Re: [PATCH V2 1/2] kexec: Make a pair of map/unmap reserved pages in error path

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Message-Id: <20160301135658.341928989a18949d97998abd@linux-foundation.org>
Date:	Tue, 1 Mar 2016 13:56:58 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Minfei Huang <mnfhuang@...il.com>
Cc:	ebiederm@...ssion.com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, mhuang@...hat.com
Subject: Re: [PATCH V2 1/2] kexec: Make a pair of map/unmap reserved pages
 in error path

On Tue,  1 Mar 2016 16:02:28 +0800 Minfei Huang <mnfhuang@...il.com> wrote:

> For some arch, kexec shall map the reserved pages, then use them, when
> we try to start the kdump service.

Which architectures are these, by the way?

> kexec may return directly, without unmaping the reserved pages, if it
> fails during starting service. To fix it, we make a pair of map/unmap
> reserved pages both in generic path and error path.

I'm having trouble understanding the urgency of this patch.  Do you
think it is needed in 4.5?  -stable?  If so, why?

Thanks.