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With gcc 10.3, there is this compiler error: compiler.h:56:26: error: this statement may fall through mpc52xx_gpt.c:586:2: note: here 586 | case WDIOC_GETTIMEOUT: | ^~~~ So add the fallthrough pseudo keyword. Signed-off-by: Tom Rix <trix@redhat.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210601190200.2637776-1-trix@redhat.com