Re: [PATCH v2 13/24] sh/cpu: Make sure play_dead() doesn't return

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On 14/2/23 08:05, Josh Poimboeuf wrote:
play_dead() doesn't return.  Make that more explicit with a BUG().

BUG() is preferable to unreachable() because BUG() is a more explicit
failure mode and avoids undefined behavior like falling off the edge of
the function into whatever code happens to be next.

Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
---
  arch/sh/include/asm/smp-ops.h | 1 +
  1 file changed, 1 insertion(+)

diff --git a/arch/sh/include/asm/smp-ops.h b/arch/sh/include/asm/smp-ops.h
index e27702130eb6..63866b1595a0 100644
--- a/arch/sh/include/asm/smp-ops.h
+++ b/arch/sh/include/asm/smp-ops.h
@@ -27,6 +27,7 @@ static inline void plat_smp_setup(void)
  static inline void play_dead(void)
  {
  	mp_ops->play_dead();
+	BUG();
  }

Shouldn't we decorate plat_smp_ops::play_dead() as noreturn first?



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