* Andi Kleen <[email protected]> wrote:
> > #define switch_to(prev,next,last) do { \
> > unsigned long esi,edi; \
> > - asm volatile("pushl %%ebp\n\t" \
> > + asm volatile("pushfl\n\t" /* Save flags */ \
> > + "pushl %%ebp\n\t" \
>
> We used to do that pushfl/popfl some time ago, but Ben removed it
> because it was slow on P4. Ok, nobody thought of that case back then.
I _should_ have thought of that though, because when this change was
done originally i had to reintroduce it both for exec-shield and for
-rt, so apparently it must have triggered in certain circumstances - i
just didnt notice the reason. (but recent exec-shield and -rt patches
dont have this revert, so the condition must have gone away. But it was
a long time ago.)
Ingo
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