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/[email protected]
Signed-off-by: Marco Elver <[email protected]>
Reviewed-by: Alexander Potapenko <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Reviewed-by: Andrey Konovalov <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Vijayanand Jitta <[email protected]>
Cc: "Gustavo A. R. Silva" <[email protected]>
Cc: Imran Khan <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>