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Date:   Fri, 3 Nov 2017 09:59:58 +0100
From:   Michal Hocko <>
To:     Pavel Tatashin <>
Subject: Re: [PATCH v1 1/1] mm: buddy page accessed before initialized

On Thu 02-11-17 12:10:39, Pavel Tatashin wrote:
> > > 
> > > Yes, but as I said, unfortunately memset(1) with CONFIG_VM_DEBUG does not
> > > catch this case. So, when CONFIG_VM_DEBUG is enabled kexec reboots without
> > > issues.
> > 
> > Can we make the init pattern to catch this?
> Unfortunately, that is not easy: memset() gives us only one byte to play
> with, and if we use something else that will make CONFIG_VM_DEBUG
> unacceptably slow.

Why cannot we do something similar to the optimized struct page
initialization and write 8B at the time and fill up the size unaligned
chunk in 1B?
Michal Hocko

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