[RFC] [PATCH] powerpc: Add MSR_DE to MSR_KERNEL
joakim.tjernlund at transmode.se
Sun Jun 3 19:20:19 EST 2012
Benjamin Herrenschmidt <benh at kernel.crashing.org> wrote on 2012/06/02 23:21:16:
> On Sat, 2012-06-02 at 20:29 +0200, Joakim Tjernlund wrote:
> > hmm, where does this go w.r.t the patch? Got the feeling that the
> > best thing is to just turn MSR:DE on and be done with it?
> Not unconditionally, we need to have a close look, that might be ok
> specifically for BookE 32-bit, it's certainly not ok for BookE 64-bit at
> this point.
> For now, I'm ok with a debug CONFIG_* option.
OK, I will wrap this with the existing CONFIG_BDI_SWITCH and only for booke
> Also do we know if MSR:DE has any performance impact on any CPU ? I know
> having DACs enabled has a major impact on some for example.
No idea, this is something for Freescale to dwell on.
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