Messages in this thread | | | Date | Thu, 31 May 2007 14:21:38 -0700 | From | Andrew Morton <> | Subject | Re: [patch 8/9] F00F bug fixup for i386 - use conditional calls |
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On Thu, 31 May 2007 17:07:55 -0400 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> wrote:
> * Andrew Morton (akpm@linux-foundation.org) wrote: > > > > Use the faster conditional calls for F00F bug handling in do_page_fault. > > > > > > > I guess this means that CONDCALL will be enabled on pretty much all i386, > > in which case making the whole feature Kconfigurable is starting to look > > marginal. > > > > Perhaps a better approach would have to made this change dependent upon > > CONDCALL, rather than forcing it on. > > > > Do you mean making X86_F00F_BUG depend on COND_CALL instead of selecting > it ?
yup
> > > + if (cond_call(fix_f00f, do_f00f_workaround(regs, address))) > > > + return; > > > > We do a cond_call() to an inlined function? That's a bit weird, isn't it? > > > > Yes, but it works :) I will add this information to the documentation.
But why does it work? Did the compiler generate an out-of-line copy of the function? If so, we'll end up with multiple copies of the function if there are other callers. If not, the `inline' was pointless. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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