linux-kernel - Re: [PATCH 1/3] hexagon: fix ffz/fls/ffs return type

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Date:   Sat, 7 Apr 2018 20:35:25 -0500
From:   Richard Kuo <rkuo@...eaurora.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-hexagon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] hexagon: fix ffz/fls/ffs return type

On Fri, Apr 06, 2018 at 04:28:21PM +0200, Arnd Bergmann wrote:
> Let's use the same return type as the major architectures to
> avoid warnings like
> 
> drivers/ata/libahci_platform.c: In function 'ahci_platform_init_host':
> drivers/ata/libahci_platform.c:561:12: warning: comparison of distinct pointer types lacks a cast [enabled by default]
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/hexagon/include/asm/bitops.h | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/hexagon/include/asm/bitops.h b/arch/hexagon/include/asm/bitops.h
> index 5e4a59b3ec1b..8790a50b1f5e 100644
> --- a/arch/hexagon/include/asm/bitops.h
> +++ b/arch/hexagon/include/asm/bitops.h
> @@ -194,7 +194,7 @@ static inline int __test_bit(int nr, const volatile unsigned long *addr)
>   *
>   * Undefined if no zero exists, so code should check against ~0UL first.
>   */
> -static inline long ffz(int x)
> +static inline int ffz(int x)
>  {
>  	int r;
>  
> @@ -211,7 +211,7 @@ static inline long ffz(int x)
>   * This is defined the same way as ffs.
>   * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
>   */
> -static inline long fls(int x)
> +static inline int fls(int x)
>  {
>  	int r;
>  
> @@ -232,7 +232,7 @@ static inline long fls(int x)
>   * the libc and compiler builtin ffs routines, therefore
>   * differs in spirit from the above ffz (man ffs).
>   */
> -static inline long ffs(int x)
> +static inline int ffs(int x)
>  {
>  	int r;
>  


Isn't ffz usually long/unsigned long on other architectures?





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