linux-kernel - [PATCH] powerpc/cacheflush: fix variable set but not used

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Message-Id: <1559829493-28457-1-git-send-email-cai@lca.pw>
Date:   Thu,  6 Jun 2019 09:58:13 -0400
From:   Qian Cai <cai@....pw>
To:     mpe@...erman.id.au
Cc:     benh@...nel.crashing.org, paulus@...ba.org,
        akpm@...ux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Qian Cai <cai@....pw>
Subject: [PATCH] powerpc/cacheflush: fix variable set but not used

The powerpc's flush_cache_vmap() is defined as a macro and never use
both of its arguments, so it will generate a compilation 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]

Fix it by making it an inline function.

Signed-off-by: Qian Cai <cai@....pw>
---
 arch/powerpc/include/asm/cacheflush.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/cacheflush.h b/arch/powerpc/include/asm/cacheflush.h
index 74d60cfe8ce5..fd318f7c3eed 100644
--- a/arch/powerpc/include/asm/cacheflush.h
+++ b/arch/powerpc/include/asm/cacheflush.h
@@ -29,9 +29,12 @@
  * not expect this type of fault. flush_cache_vmap is not exactly the right
  * place to put this, but it seems to work well enough.
  */
-#define flush_cache_vmap(start, end)		do { asm volatile("ptesync" ::: "memory"); } while (0)
+static inline void flush_cache_vmap(unsigned long start, unsigned long end)
+{
+	asm volatile("ptesync" ::: "memory");
+}
 #else
-#define flush_cache_vmap(start, end)		do { } while (0)
+static inline void flush_cache_vmap(unsigned long start, unsigned long end) { }
 #endif
 
 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
-- 
1.8.3.1