linux-kernel - [PATCH 3/3] arm64: smp: Mark expected switch fall-through

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Message-Id: <20190726112725.19204-1-anders.roxell@linaro.org>
Date:   Fri, 26 Jul 2019 13:27:25 +0200
From:   Anders Roxell <anders.roxell@...aro.org>
To:     catalin.marinas@....com, will@...nel.org
Cc:     mark.rutland@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Anders Roxell <anders.roxell@...aro.org>
Subject: [PATCH 3/3] arm64: smp: Mark expected switch fall-through

When fall-through warnings was enabled by default the following warning
was starting to show up:

In file included from ../include/linux/kernel.h:15,
                 from ../include/linux/list.h:9,
                 from ../include/linux/kobject.h:19,
                 from ../include/linux/of.h:17,
                 from ../include/linux/irqdomain.h:35,
                 from ../include/linux/acpi.h:13,
                 from ../arch/arm64/kernel/smp.c:9:
../arch/arm64/kernel/smp.c: In function ‘__cpu_up’:
../include/linux/printk.h:302:2: warning: this statement may fall
 through [-Wimplicit-fallthrough=]
  printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../arch/arm64/kernel/smp.c:156:4: note: in expansion of macro ‘pr_crit’
    pr_crit("CPU%u: may not have shut down cleanly\n", cpu);
    ^~~~~~~
../arch/arm64/kernel/smp.c:157:3: note: here
   case CPU_STUCK_IN_KERNEL:
   ^~~~

Rework so that the compiler doesn't warn about fall-through.

Fixes: d93512ef0f0e ("Makefile: Globally enable fall-through warning")
Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
---
 arch/arm64/kernel/smp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index ea90d3bd9253..018a33e01b0e 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -152,8 +152,8 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
 				pr_crit("CPU%u: died during early boot\n", cpu);
 				break;
 			}
-			/* Fall through */
 			pr_crit("CPU%u: may not have shut down cleanly\n", cpu);
+			/* Fall through */
 		case CPU_STUCK_IN_KERNEL:
 			pr_crit("CPU%u: is stuck in kernel\n", cpu);
 			if (status & CPU_STUCK_REASON_52_BIT_VA)
-- 
2.20.1