linux-kernel - Re: [PATCH v2] s390/kexec: Consolidate crash_map/unmap_reserved_pages() and arch_kexec_protect(unprotect)

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Message-ID: <20160405111316.2fa4772c@holzheu>
Date:	Tue, 5 Apr 2016 11:13:16 +0200
From:	Michael Holzheu <holzheu@...ux.vnet.ibm.com>
To:	Xunlei Pang <xlpang@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	akpm@...ux-foundation.org, ebiederm@...ssion.com,
	Minfei Huang <mhuang@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>, Baoquan He <bhe@...hat.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH v2] s390/kexec: Consolidate
 crash_map/unmap_reserved_pages() and
 arch_kexec_protect(unprotect)_crashkres()

Hello Xunlei,

On Tue,  5 Apr 2016 15:09:59 +0800
Xunlei Pang <xlpang@...hat.com> wrote:
> Commit 3f625002581b ("kexec: introduce a protection mechanism
> for the crashkernel reserved memory") is a similar mechanism
> for protecting the crash kernel reserved memory to previous
> crash_map/unmap_reserved_pages() implementation, the new one
> is more generic in name and cleaner in code (besides, some
> arch may not be allowed to unmap the pgtable).
> 
> Therefore, this patch consolidates them, and uses the new
> arch_kexec_protect(unprotect)_crashkres() to replace former
> crash_map/unmap_reserved_pages() which by now has been only
> used by S390.
> 
> The consolidation work needs the crash memory to be mapped
> initially, so get rid of S390 crash kernel memblock removal
> in reserve_crashkernel().

If you fix this comment, I am fine with your patch.

Acked-by: Michael Holzheu <holzheu@...ux.vnet.ibm.com>