Re: [PATCH] likely cleanup: remove unlikely for kfree(NULL)

From: Arjan van de Ven
Date: Wed Apr 26 2006 - 06:09:36 EST


On Wed, 2006-04-26 at 12:05 +0200, JÃrn Engel wrote:
> On Wed, 26 April 2006 10:27:18 +0200, Arjan van de Ven wrote:
> >
> > what I would like is kfree to become an inline wrapper that does the
> > null check inline, that way gcc can optimize it out (and it will in 4.1
> > with the VRP pass) if gcc can prove it's not NULL.
>
> How well can gcc optimize this case?

if you deref'd the pointer it'll optimize it away (assuming a new enough
gcc, like 4.1)


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/