linux-kernel - Re: [PATCH v3 1/3] kexec: Move vmcoreinfo out of the kernel's .bss section

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Message-ID: <20170321102756.795fe8ae@hananiah.suse.cz>
Date:   Tue, 21 Mar 2017 10:27:56 +0100
From:   Petr Tesarik <ptesarik@...e.cz>
To:     Xunlei Pang <xlpang@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        Baoquan He <bhe@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        akpm@...ux-foundation.org, Dave Young <dyoung@...hat.com>
Subject: Re: [PATCH v3 1/3] kexec: Move vmcoreinfo out of the kernel's .bss
 section

On Mon, 20 Mar 2017 13:50:31 +0800
Xunlei Pang <xlpang@...hat.com> wrote:

> As Eric said,
> "what we need to do is move the variable vmcoreinfo_note out
> of the kernel's .bss section.  And modify the code to regenerate
> and keep this information in something like the control page.
> 
> Definitely something like this needs a page all to itself, and ideally
> far away from any other kernel data structures.  I clearly was not
> watching closely the data someone decided to keep this silly thing
> in the kernel's .bss section."
> 
> This patch allocates extra pages for these vmcoreinfo_XXX variables,
> one advantage is that it enhances some safety of vmcoreinfo, because
> vmcoreinfo now is kept far away from other kernel data structures.

Yes, I like this patch set very much now. Thank you!

Petr T