Re: [PATCH] kexec: Avoid overwriting the current pgd (x86_64)

[Andi Kleen]

Magnus Damm <magnus@xxxxxxxxxxxxx> writes:

> --===============82697867595349228==
> 
> kexec: Avoid overwriting the current pgd (x86_64)
> 
> This patch upgrades the x86_64-specific kexec code to avoid overwriting the
> current pgd. Overwriting the current pgd is bad when CONFIG_CRASH_DUMP is used
> to start a secondary kernel that dumps the memory of the previous kernel.

Why is it bad?

-Andi
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