Re: slab hang on boot

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From: Meelis Roos <[email protected]>
Date: Mon, 14 May 2007 21:36:42 +0300 (EEST)

> Sorry, I could not test the parport patch yet - I did git upgrade as of 
> yesterday and the kernel hangs on boot. boot -p reveals the following 
> slab panic:

Please enable SLUB to work around this for now, SLAB wants
LARGE_ALLOCS enabled when it really shouldn't require that
for a 512K or 1MB SLAB when PAGE_SIZE==8192 :-(

> kmem_cache_create: Early error in slab tsb_512KB
> kernel BUG at mm/slab.c:2165!

Christoph, this is why I had to have LARGE_ALLOCS enabled on sparc64
all this time, for that MAX_OBJ_ORDER logic in mm/slab.c in order
to get 512K and 1MB slab caches usable.

This inconsistency is painful for platforms.  If I enable LARGE_ALLOCS
on sparc64 then SLAB works but it's a total waste for SLUB.

Right now if I enable LARGE_ALLOCS, SLUB will break again due to
that KMALLOC_SHIFT_HIGH bug we fixed the other week, Christophe
can you at least push that fix to Linus if you haven't already?

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