linux-kernel - Re: [PATCH v2 1/7] s390/kdump: implement is_kdump

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Message-ID: <20241023074237.8013-B-hca@linux.ibm.com>
Date: Wed, 23 Oct 2024 09:42:37 +0200
From: Heiko Carstens <hca@...ux.ibm.com>
To: David Hildenbrand <david@...hat.com>
Cc: Alexander Egorenkov <egorenar@...ux.ibm.com>, agordeev@...ux.ibm.com,
        akpm@...ux-foundation.org, borntraeger@...ux.ibm.com,
        cohuck@...hat.com, corbet@....net, eperezma@...hat.com,
        frankja@...ux.ibm.com, gor@...ux.ibm.com, imbrenda@...ux.ibm.com,
        jasowang@...hat.com, kvm@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-s390@...r.kernel.org, mcasquer@...hat.com, mst@...hat.com,
        svens@...ux.ibm.com, thuth@...hat.com, virtualization@...ts.linux.dev,
        xuanzhuo@...ux.alibaba.com, zaslonko@...ux.ibm.com
Subject: Re: [PATCH v2 1/7] s390/kdump: implement is_kdump_kernel()

On Mon, Oct 21, 2024 at 04:45:59PM +0200, David Hildenbrand wrote:
> For my purpose (virtio-mem), it's sufficient to only support "kexec
> triggered kdump" either way, so I don't care.
> 
> So for me it's good enough to have
> 
> bool is_kdump_kernel(void)
> {
> 	return oldmem_data.start;
> }
> 
> And trying to document the situation in a comment like powerpc does :)

Then let's go forward with this, since as Alexander wrote, this is returning
what is actually happening. If this is not sufficient or something breaks we
can still address this.