Messages in this thread | | | From | Rusty Russell <> | Subject | Re: [PATCH] modules: Use a better scheme for refcounting | Date | Mon, 19 May 2008 00:31:44 +1000 |
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On Saturday 17 May 2008 17:36:21 Eric Dumazet wrote: > Christoph Lameter made good work last year and apparently the path is to : > > 1) Put pda at the begining of percpu section.
Well, we killed the pda on i386: it's basically a limited arch-specific percpu section. Unfortunately, ISTR that doing so kills -fstack-protector on x86-64 (gcc was explicitly patched to support the kernel doing this, but it nailed us to a fixed offset off %fs). But the PDA is a redundant idea which should be removed.
> 2) Relocate percpu variables to begin at zero > 3) Use %gs (or %fs) register to address pda AND percpu section.
Thanks for the prod Eric. ISTR acking those patches; Christoph, what happened to them?
Cheers, Rusty.
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