Re: [PATCH] i386-pda UP optimization

[Jeremy Fitzhardinge]

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.

    J
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