Messages in this thread | | | Date | Fri, 9 Sep 2005 00:17:44 -0700 (PDT) | From | Zwane Mwaikambo <> | Subject | Re: [RFC] Scheduler hooks to support separate ia64 MCA/INIT stacks |
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On Fri, 9 Sep 2005, Keith Owens wrote:
> The new ia64 MCA/INIT handlers[1] (think of them as super NMI) run on > separate stacks. 99% of the changes for these new handlers is ia64 > only code, however they need a couple of scheduler hooks to support > these extra stacks. The complete patch set will be coming through the > ia64 tree, this RFC covers just the scheduler changes, so they do not > come as a surprise when the ia64 tree is rolled up. > > [1] http://marc.theaimsgroup.com/?l=linux-ia64&m=112537827113545&w=2 > and the following patches.
Thanks that gave a lot of background.
> This patch adds two small hooks that can be safely called from MCA/INIT > context. If other architectures want to support NMI on separate stacks > then they can also use these functions.
Well x86_64 already does this with NMI being setup as ISTs, the difference is that there we use a register to access current (via PDA/%gs). I might have missed this in the URL you posted, but how come IA64 can't do this via r13?
Thanks, Zwane
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