Re: [PATCH v3 02/31] arm64: Kernel booting and initialisation

From: Arnd Bergmann
Date: Mon Sep 10 2012 - 10:50:53 EST

On Monday 10 September 2012, Nicolas Pitre wrote:
> On Mon, 10 Sep 2012, Arnd Bergmann wrote:
> > On Monday 10 September 2012, Catalin Marinas wrote:
> > > On Mon, Sep 10, 2012 at 06:53:39AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > I think a bunch of other architectures can have relocatable kernels, which
> > is useful e.g. for kdump. It does imply a small runtime cost and may have
> > other disadvantages though.
> Relocatable in physical space is what kdump actually needs, and that's
> what we already have here (as well as on ARM32 for that matter with
> CONFIG_ARM_PATCH_PHYS_VIRT). Relocatable in the virtual space is costly
> and we shouldn't need to go there.

Ah, I see. I thought that the other architectures (powerpc and x86)
doing this were actually building with -fPIC, but they do the same
kind of early patching that we do.

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