lib/stackdepot: use page allocator if both slab and memblock is unavailable

lib/stackdepot: use page allocator if both slab and memblock is unavailable

After commit 2dba5eb1c73b ("lib/stackdepot: allow optional init and
stack_table allocation by kvmalloc()"), stack_depot_init() is called later
if CONFIG_STACKDEPOT_ALWAYS_INIT=n to remove unnecessary memory usage.  It
allocates stack_table using memblock_alloc() or kvmalloc() depending on
availability of slab allocator.

But when stack_depot_init() is called while creating boot slab caches,
both slab allocator and memblock is not available.  So kernel crashes.
Allocate stack_table from page allocator when both slab allocator and
memblock is unavailable.

Limit size of stack_table when using page allocator because vmalloc() is
also unavailable in kmem_cache_init().  It must not be larger than
(PAGE_SIZE << (MAX_ORDER - 1)).

This patch was tested on both CONFIG_STACKDEPOT_ALWAYS_INIT=y and n.

[lkp@intel.com: fix W=1 build warning]
Link: https://lkml.kernel.org/r/YhtDCoHWsF11rwze@ip-172-31-19-208.ap-northeast-1.compute.internal
Fixes: 2dba5eb1c73b ("lib/stackdepot: allow optional init and stack_table allocation by kvmalloc()")
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Oliver Glitta <glittao@gmail.com>
Cc: Faiyaz Mohammed <faiyazm@codeaurora.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Johannes Berg <johannes.berg@intel.com>
Cc: Yury Norov <yury.norov@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: James Bottomley <James.Bottomley@hansenpartnership.com>
Cc: Matteo Croce <mcroce@microsoft.com>
Cc: Marco Elver <elver@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Imran Khan <imran.f.khan@oracle.com>
Cc: Zqiang <qiang.zhang@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>