linux-kernel - [PATCH -next] smp: Fix unused-but-set-variable warning

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Date:   Mon, 6 Jul 2020 21:49:19 +0800
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Hulk Robot <hulkci@...wei.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Peter Xu <peterx@...hat.com>
CC:     Wei Yongjun <weiyongjun1@...wei.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH -next] smp: Fix unused-but-set-variable warning

Gcc report build warning as follows:

kernel/smp.c:126:15: warning:
 variable 'csd_type' set but not used [-Wunused-but-set-variable]
  126 |  unsigned int csd_type;
      |               ^~~~~~~~

'csd_type' is only used when CONFIG_64BIT defined, so move them
under '#ifdef'.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 kernel/smp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index 6ec6c9578225..0130bdcf6d26 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -123,10 +123,10 @@ static void csd_lock_record(call_single_data_t *csd)
 
 static __always_inline int csd_lock_wait_getcpu(call_single_data_t *csd)
 {
+#ifdef CONFIG_64BIT
 	unsigned int csd_type;
 
 	csd_type = CSD_TYPE(csd);
-#ifdef CONFIG_64BIT
 	if (csd_type == CSD_TYPE_ASYNC || csd_type == CSD_TYPE_SYNC)
 		return csd->dst; // Other CSD_TYPE_ values might not have ->dst.
 #endif