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Enable support for IRQ stacks on !MMU, and add the code to the IRQ entry path to switch to the IRQ stack if not running from it already. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Tested-by: Marc Zyngier <maz@kernel.org> Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M