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The softlockup detector would like to use get_irq_regs(), so generalize the
availability on every Linux architecture.(It is fine for an architecture to always return NULL to get_irq_regs(),
which it does by default.)Signed-off-by: Ingo Molnar
Cc: Ian Molton
Cc: Kumar Gala
Cc: Paul Mackerras
Cc: Benjamin Herrenschmidt
Cc: Mikael Starvik
Cc: Miles Bader
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds