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SubjectRe: [Fastboot] [PATCH] Reserving backup region for kexec based crashdumps.
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Hi Vivek, 

> > Hi Vivek and Eric,
> >
> > IMHO, why don't we swap not only the contents of the top 640K
> > but also kernel working memory for kdump kernel?
>
>
> Initial patches of kdump had adopted the same approach but given the
> fact devices are not stopped during transition to new kernel after a
> panic, it carried inherent risk of some DMA going on and corrupting the
> new kernel/data structures. Hence the idea of running the kernel from a
> reserved location came up. This should be DMA safe as long as DMA is not
> misdirected.

I see, that makes sense.
But I'm not sure yet that it's safe to access the top of 640MB.
I wonder how kmalloc(GFP_DMA) works in a kdump kernel.

Thanks,
Hirokazu Takahashi.
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