On Thu, Jan 02, 2014 at 04:17:08PM +0100, Andrew Jones wrote:
> On Sat, Dec 28, 2013 at 10:30:24PM -0800, Christoffer Dall wrote:
> > > +
> > > + if (s != (s & ~(pagesize - 1))) {
> >
> > you're just testing 'if (s & (pagesize -1))' right?
>
> yeah, I'll simplify that.
>
> >
> > > + s += pagesize;
> > > + s &= ~(pagesize - 1);
> > > + p = (void *)s;
> > > + }
> >
> > a one-line comment on this block saying 'page-align start of heap would
> > be nice.
>
> added
>
> >
> > > +
> > > + while (size >= pagesize) {
> > > + *(void **)p = free_head;
> > > + free_head = p;
> > > + p += pagesize;
> > > + size -= pagesize;
> > > + }
> >
> > you could also be nice and comment this block of code, saying something
> > like "set up linked list of free pages using the pages themselves as the
> > data structure" if you should feel so inclined.
>
> added "link free pages"
>
> >
> > why are you not trusting start to be page aligned but you are trusting
> > size to be? If size is smaller than pagesize then this loop will go
> > nuts won't it?
>
> I don't see how. As soon as size is less than pagesize we won't
> [re]enter the loop, and thus it can never go negative (big positive).
>
yeah you're right. duh.
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