ppc: make PPC_BOOK3S_64 select IRQ_WORK
Fix breakage which will be exposed by the patch "kconfig: make allnoconfig disable options behind EMBEDDED and EXPERT". arch/powerpc/kernel/mce.c, compiled in for PPC_BOOK3S_64, calls functions only built when IRQ_WORK, so select it. Fixes the following build error: arch/powerpc/kernel/built-in.o: In function `.machine_check_queue_event': (.text+0x11260): undefined reference to `.irq_work_queue' Signed-off-by: NJosh Triplett <josh@joshtriplett.org> Reported-by: NStephen Rothwell <sfr@canb.auug.org.au> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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