[9fans] kernel bug

[Yoann Padioleau <pad@fb.com>]

Hi,

in the newseg() function there is:

    mapsize = ROUND(size, PTEPERTAB)/PTEPERTAB;
    if(mapsize > nelem(s->ssegmap)){
        mapsize *= 2;
        if(mapsize > (SEGMAPSIZE*PTEPERTAB))
            mapsize = (SEGMAPSIZE*PTEPERTAB);
        s->map = smalloc(mapsize*sizeof(Pte*));
        s->mapsize = mapsize;
    }
    else{
        s->map = s->ssegmap;
        s->mapsize = nelem(s->ssegmap);
    }

I think it should be
if(mapsize > (SEGMAPSIZE))
            mapsize = SEGMAPSIZE;

Also why in the kernel they use 'struct Pte' instead of the better name Pagetable.
In many places this is very confusing because when I see Pte I think of a Pagetable Entry
where really they are speaking about a Pagetable.