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When delivering a hw-breakpoint SIGTRAP to a compat task via ptrace, the lack of a 'return' statement means we fallthrough to the native case, which differs in its handling of 'si_errno'. Although this looks to be harmless because the subsequent signal is effectively ignored, it's confusing and unintentional, so add the missing 'return'. Signed-off-by: Keno Fischer <keno@juliacomputing.com> Link: https://lore.kernel.org/r/20210202002109.GA624440@juliacomputing.com Signed-off-by: Will Deacon <will@kernel.org>