linux-kernel - Re: [PATCHv7] x86/kdump: bugfix, make the behavior of crashkernel=X consistent with kaslr

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Message-ID: <20190225093950.GB26145@zn.tnic>
Date:   Mon, 25 Feb 2019 10:39:51 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Pingfan Liu <kernelfans@...il.com>
Cc:     Joerg Roedel <jroedel@...e.de>, Dave Young <dyoung@...hat.com>,
        Baoquan He <bhe@...hat.com>,
        Jerry Hoemann <jerry.hoemann@....com>, x86@...nel.org,
        Randy Dunlap <rdunlap@...radead.org>,
        kexec@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yinghai Lu <yinghai@...nel.org>, vgoyal@...hat.com,
        iommu@...ts.linux-foundation.org, konrad.wilk@...cle.com
Subject: Re: [PATCHv7] x86/kdump: bugfix, make the behavior of crashkernel=X
 consistent with kaslr

On Sun, Feb 24, 2019 at 09:25:18PM +0800, Pingfan Liu wrote:
> Maybe I misunderstood you, but does "requested range failed" mean that
> user specify the range? If yes, then it should be the duty of user as
> you said later, not the duty of kernel"

No, it should say that it selected a different range only when the user
didn't specify it. Which would mean that the user didn't care about the
range - she/he only wanted to have *any* crashkernel range reserved.
I.e., crashkernel=X invocation.

> We do not know the memory layout of a system, maybe a system with
> memory less than 4GB. So it is better to try all the range of system
> memory.

Ok. If 4G fails, you set high and then try again.

-- 
Regards/Gruss,
    Boris.

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