Messages in this thread | | | From | Rusty Russell <> | Subject | Re: [patch 05/14] percpu: Use a Kconfig variable to configure arch specific percpu setup | Date | Wed, 28 Nov 2007 12:36:01 +1100 |
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On Wednesday 28 November 2007 05:14:47 Christoph Lameter wrote: > On Tue, 27 Nov 2007, Rusty Russell wrote: > > Have you considered moving x86-64's setup_per_cpu_areas into generic > > code? It's a bit messier because some archs might not have set up NUMA > > stuff yet, but it's logically generic... > > Yes that will happen later. This is just the early cleanup work. I > plan to generally bring the two x86 arches in line. The pda will be > folded into the per cpu area and after that its easy to do.
Unfortunately, we tried to get rid of the x86-64 pda (like i386) but you lose the ability to use the stack protection config option. That's because it assumes that gs:0x68 (or something) is the stack canary; we need a YA gcc change to make this gs:__builtin_stack_canary_off (where gcc can emit __builtin_stack_canary_off as a weak absolute symbol, so we can override it for the kernel.
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