lib/stackdepot: always do filter_irq_stacks() in stack_depot_save()

lib/stackdepot: always do filter_irq_stacks() in stack_depot_save()

The non-interrupt portion of interrupt stack traces before interrupt entry
is usually arbitrary.  Therefore, saving stack traces of interrupts (that
include entries before interrupt entry) to stack depot leads to unbounded
stackdepot growth.

As such, use of filter_irq_stacks() is a requirement to ensure stackdepot
can efficiently deduplicate interrupt stacks.

Looking through all current users of stack_depot_save(), none (except
KASAN) pass the stack trace through filter_irq_stacks() before passing it
on to stack_depot_save().

Rather than adding filter_irq_stacks() to all current users of
stack_depot_save(), it became clear that stack_depot_save() should simply
do filter_irq_stacks().

Link: https://lkml.kernel.org/r/20211130095727.2378739-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vijayanand Jitta <vjitta@codeaurora.org>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Imran Khan <imran.f.khan@oracle.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>