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From: Nathan Chancellor <nathan@kernel.org>
To: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	Zhen Lei <thunder.leizhen@huawei.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
	llvm@lists.linux.dev
Subject: Re: [PATCH v3] lib/zlib_inflate/inffast: Check config in C to avoid unused function warning
Date: Mon, 20 Sep 2021 08:45:08 -0700	[thread overview]
Message-ID: <YUishGbHeaDMJDj+@archlinux-ax161> (raw)
In-Reply-To: <20210920084332.5752-1-pmenzel@molgen.mpg.de>

On Mon, Sep 20, 2021 at 10:43:33AM +0200, Paul Menzel wrote:
> Building Linux for ppc64le with Ubuntu clang version 12.0.0-3ubuntu1~21.04.1
> shows the warning below.
> 
>     arch/powerpc/boot/inffast.c:20:1: warning: unused function 'get_unaligned16' [-Wunused-function]
>     get_unaligned16(const unsigned short *p)
>     ^
>     1 warning generated.
> 
> Fix it, by moving the check from the preprocessor to C, so the compiler
> sees the use.
> 
> Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>

Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>

> ---
> v2: Use IS_ENABLED
> v3: Use if statement over ternary operator as requested by Christophe
> 
>  lib/zlib_inflate/inffast.c | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/lib/zlib_inflate/inffast.c b/lib/zlib_inflate/inffast.c
> index f19c4fbe1be7..2843f9bb42ac 100644
> --- a/lib/zlib_inflate/inffast.c
> +++ b/lib/zlib_inflate/inffast.c
> @@ -253,13 +253,12 @@ void inflate_fast(z_streamp strm, unsigned start)
>  
>  			sfrom = (unsigned short *)(from);
>  			loops = len >> 1;
> -			do
> -#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
> -			    *sout++ = *sfrom++;
> -#else
> -			    *sout++ = get_unaligned16(sfrom++);
> -#endif
> -			while (--loops);
> +			do {
> +			    if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS))
> +				*sout++ = *sfrom++;
> +			    else
> +				*sout++ = get_unaligned16(sfrom++);
> +			} while (--loops);
>  			out = (unsigned char *)sout;
>  			from = (unsigned char *)sfrom;
>  		    } else { /* dist == 1 or dist == 2 */
> -- 
> 2.33.0
> 

WARNING: multiple messages have this Message-ID (diff)
From: Nathan Chancellor <nathan@kernel.org>
To: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: llvm@lists.linux.dev, Zhen Lei <thunder.leizhen@huawei.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v3] lib/zlib_inflate/inffast: Check config in C to avoid unused function warning
Date: Mon, 20 Sep 2021 08:45:08 -0700	[thread overview]
Message-ID: <YUishGbHeaDMJDj+@archlinux-ax161> (raw)
In-Reply-To: <20210920084332.5752-1-pmenzel@molgen.mpg.de>

On Mon, Sep 20, 2021 at 10:43:33AM +0200, Paul Menzel wrote:
> Building Linux for ppc64le with Ubuntu clang version 12.0.0-3ubuntu1~21.04.1
> shows the warning below.
> 
>     arch/powerpc/boot/inffast.c:20:1: warning: unused function 'get_unaligned16' [-Wunused-function]
>     get_unaligned16(const unsigned short *p)
>     ^
>     1 warning generated.
> 
> Fix it, by moving the check from the preprocessor to C, so the compiler
> sees the use.
> 
> Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>

Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>

> ---
> v2: Use IS_ENABLED
> v3: Use if statement over ternary operator as requested by Christophe
> 
>  lib/zlib_inflate/inffast.c | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/lib/zlib_inflate/inffast.c b/lib/zlib_inflate/inffast.c
> index f19c4fbe1be7..2843f9bb42ac 100644
> --- a/lib/zlib_inflate/inffast.c
> +++ b/lib/zlib_inflate/inffast.c
> @@ -253,13 +253,12 @@ void inflate_fast(z_streamp strm, unsigned start)
>  
>  			sfrom = (unsigned short *)(from);
>  			loops = len >> 1;
> -			do
> -#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
> -			    *sout++ = *sfrom++;
> -#else
> -			    *sout++ = get_unaligned16(sfrom++);
> -#endif
> -			while (--loops);
> +			do {
> +			    if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS))
> +				*sout++ = *sfrom++;
> +			    else
> +				*sout++ = get_unaligned16(sfrom++);
> +			} while (--loops);
>  			out = (unsigned char *)sout;
>  			from = (unsigned char *)sfrom;
>  		    } else { /* dist == 1 or dist == 2 */
> -- 
> 2.33.0
> 

  reply	other threads:[~2021-09-20 15:45 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-20  8:43 [PATCH v3] lib/zlib_inflate/inffast: Check config in C to avoid unused function warning Paul Menzel
2021-09-20  8:43 ` Paul Menzel
2021-09-20 15:45 ` Nathan Chancellor [this message]
2021-09-20 15:45   ` Nathan Chancellor
2021-09-21 10:11   ` Paul Menzel
2021-09-21 10:11     ` Paul Menzel

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