Messages in this thread | | | Date | Wed, 15 Nov 2006 09:52:29 -0800 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH] i386-pda UP optimization |
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Eric Dumazet wrote: > I wish Jeremy give us patches for UP machines so that %gs can be let untouched > in entry.S (syscall entry/exit). A lot of ia32 machines are still using one > CPU. > Unfortunately that would add cruft in a number of places. At the moment, context switch, ptrace and vm86 all assume entry.S has saved %gs into pt_regs, so they can treat it like any other register. If this were conditional, it would require multiple places to add #ifndef CONFIG_SMP code, which is not something I'd like to do without a good reason.
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