On Wed, Jul 26, 2006 at 01:05:43PM +0300, Pekka J Enberg wrote:
> On Wed, 26 Jul 2006, Heiko Carstens wrote:
> > Since ARCH_KMALLOC_MINALIGN didn't work on s390 I tried ARCH_SLAB_MINALIGN
> > instead, just to find out that it didn't work too.
> > In case of CONFIG_DEBUG_SLAB kmem_cache_create() creates caches with an
> > alignment lesser than ARCH_SLAB_MINALIGN, which it shouldn't according to
> > this comment in mm/slab.c :
>
> [snip]
>
> > Index: linux-2.6/mm/slab.c
> > ===================================================================
> > --- linux-2.6.orig/mm/slab.c 2006-07-26 09:55:54.000000000 +0200
> > +++ linux-2.6/mm/slab.c 2006-07-26 09:57:07.000000000 +0200
> > @@ -2103,6 +2103,9 @@
> > if (ralign > BYTES_PER_WORD)
> > flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
> > }
> > + if (BYTES_PER_WORD < ARCH_SLAB_MINALIGN)
> > + flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
> > +
> > /* 3) caller mandated alignment: disables debug if necessary */
> > if (ralign < align) {
> > ralign = align;
>
> This is similar to my patch and should be enough to fix the problem. The
> first patch seems bogus and I don't really understand why you would need
> it.
It's enough to fix the ARCH_SLAB_MINALIGN problem. But it does _not_ fix the
ARCH_KMALLOC_MINALIGN problem. s390 currently only uses ARCH_KMALLOC_MINALIGN
since that should be good enough and it doesn't disable as much debugging
as ARCH_SLAB_MINALIGN does.
What exactly isn't clear from the description of the first patch? Or why do
you consider it bogus?
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