On Sat, 26 Jun 2010, David Rientjes wrote:
> > - page = new_slab(kmalloc_caches, gfpflags, node);
> > + page = new_slab(kmalloc_caches, GFP_KERNEL, node);
> >
> > BUG_ON(!page);
> > if (page_to_nid(page) != node) {
>
> This still passes GFP_KERNEL to the page allocator when not allowed by
> gfp_allowed_mask for early (non SLAB_CACHE_DMA) users of
> create_kmalloc_cache().
Right a later patch changes that. I could fold that hunk in here.
> > @@ -2157,11 +2157,11 @@ static int init_kmem_cache_nodes(struct
> > struct kmem_cache_node *n;
> >
> > if (slab_state == DOWN) {
> > - early_kmem_cache_node_alloc(gfpflags, node);
> > + early_kmem_cache_node_alloc(node);
> > continue;
> > }
> > n = kmem_cache_alloc_node(kmalloc_caches,
> > - gfpflags, node);
> > + GFP_KERNEL, node);
> >
> > if (!n) {
> > free_kmem_cache_nodes(s);
>
> slab_state != DOWN is still not an indication that GFP_KERNEL is safe; in
> fact, all users of GFP_KERNEL from kmem_cache_init() are unsafe. These
> need to be GFP_NOWAIT.
slab_state == DOWN is a sure indicator that kmem_cache_alloc_node is not
functional. That is what we need to know here.
> > +#ifdef CONFIG_ZONE_DMA
> > + int i;
> > +
> > + for (i = 0; i < SLUB_PAGE_SHIFT; i++) {
> > + struct kmem_cache *s = &kmalloc_caches[i];
> > +
> > + if (s && s->size) {
> > + char *name = kasprintf(GFP_KERNEL,
> > + "dma-kmalloc-%d", s->objsize);
> > +
>
> You're still not handling the case where !name, which kasprintf() can
> return both here and in kmem_cache_init(). Nameless caches aren't allowed
> for CONFIG_SLUB_DEBUG.
It was not handled before either. I can come up with a patch but frankly
this is a rare corner case that does not have too high priority to get
done.
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