linux-kernel - [PATCH -next] mm: fix set but not used warning

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Date:   Mon, 18 Feb 2019 13:57:43 +0000
From:   YueHaibing <yuehaibing@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Toshi Kani <toshi.kani@....com>,
        Will Deacon <will.deacon@....com>,
        Chintan Pandya <cpandya@...eaurora.org>,
        Thomas Gleixner <tglx@...utronix.de>
CC:     YueHaibing <yuehaibing@...wei.com>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: [PATCH -next] mm: fix set but not used warning

Fixes gcc '-Wunused-but-set-variable' warning:

lib/ioremap.c: In function 'ioremap_page_range':
lib/ioremap.c:203:16: warning:
 variable 'start' set but not used [-Wunused-but-set-variable]

flush_cache_vmap may no need param, so add __maybe_unused fix this warning.

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 lib/ioremap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/ioremap.c b/lib/ioremap.c
index 063213685563..d1c7a488e731 100644
--- a/lib/ioremap.c
+++ b/lib/ioremap.c
@@ -200,7 +200,7 @@ int ioremap_page_range(unsigned long addr,
 		       unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
 {
 	pgd_t *pgd;
-	unsigned long start;
+	unsigned long __maybe_unused start;
 	unsigned long next;
 	int err;