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

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

[Qian Cai]

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@lca.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

Re: [PATCH] powerpc/cacheflush: fix variable set but not used

[Qian Cai]

Ping.

On Thu, 2019-06-06 at 09:58 -0400, Qian Cai wrote:
> 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@lca.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

Re: [PATCH] powerpc/cacheflush: fix variable set but not used

[Michael Ellerman]

On Thu, 2019-06-06 at 13:58:13 UTC, Qian Cai wrote:
> 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@lca.pw>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/04db3ede40ae4fc23a5c4237254c4a53bbe4c1f2

cheers