Re: Large Stack Usage in One More Function

[Andi Kleen <ak@xxxxxxx>]

On Tue, Aug 27, 2002 at 12:33:58PM -0500, Steve Lord wrote:
> On Tue, 2002-08-27 at 12:27, Andi Kleen wrote:
> > gcc isn't very smart in that unfortunately. All local variables no matter 
> > if in a subscope 
> > or not or being dead for most of the function or not contribute the stack 
> > frame.
> > The only way to get a separate stack frame is to either use alloca() or a 
> > different
> > function.
> > 
> > -Andi
> 
> Thanks Andi, looks like breaking up the ioctl function would be the
> best way to fix this then.

Trick is to put the separate functions after the main ioctl, otherwise it'll
break again for those people who ignore all words of reason and compile their 
kernel 
with -O3. -O3 auto inlines functions and you would get the same problem again. 
Fortunately it can only inline when the inlinee occurs before the first call of 
it.

-Andi