Re: [PATCH v2] opensm/complib/cl_passivelock.h: some casting issues

[Yevgeny Kliteynik <kliteyn-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>]

On 01/Feb/10 18:01, Yevgeny Kliteynik wrote:
> Sasha,
>
> There are couple of problematic castings in complib/cl_passivelock.h:
>
> (cl_status_t) pthread_rwlock_*()
>
> Turns out that compiler doesn't like casting directly from
> int to enum, probably because int can be negative:
>
> cl_passivelock.h:199: warning: cast from function call of type 'int' to non-matching type 'enum _cl_status'
> cl_passivelock.h:241: warning: cast from function call of type 'int' to non-matching type 'enum _cl_status'
> cl_passivelock.h:274: warning: cast from function call of type 'int' to non-matching type 'enum _cl_status'
> cl_passivelock.h:306: warning: cast from function call of type 'int' to non-matching type 'enum _cl_status'
>
> Se we can cast the return value in two stages - to unsigned
> and then to enum, but casting it once to unsigned solves
> the problem - the compiler can cast unsigned to enum w/o
> explicit casting.

Well, no. It can't do implicit casting in this case,
so there should be implicit casting in two stages.
V3 shortly...

-- Yevgeny

> Signed-off-by: Yevgeny Kliteynik<kliteyn-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
> ---
>
> Changes from v1: cosmetics - there was '//' at the
>                   end of each fixed line, removed now.
>
>   opensm/include/complib/cl_passivelock.h |    8 ++++----
>   1 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/opensm/include/complib/cl_passivelock.h b/opensm/include/complib/cl_passivelock.h
> index bafd339..aba4e64 100644
> --- a/opensm/include/complib/cl_passivelock.h
> +++ b/opensm/include/complib/cl_passivelock.h
> @@ -196,7 +196,7 @@ static inline cl_status_t cl_plock_init(IN cl_plock_t * const p_lock)
>   	cl_status_t status;
>
>   	CL_ASSERT(p_lock);
> -	status = (cl_status_t) pthread_rwlock_init(&p_lock->lock, NULL);
> +	status = (unsigned) pthread_rwlock_init(&p_lock->lock, NULL);
>   	if (status)
>   		return CL_ERROR;
>   	p_lock->state = CL_INITIALIZED;
> @@ -238,7 +238,7 @@ static inline void cl_plock_acquire(IN cl_plock_t * const p_lock)
>   	CL_ASSERT(p_lock);
>   	CL_ASSERT(p_lock->state == CL_INITIALIZED);
>
> -	status = (cl_status_t) pthread_rwlock_rdlock(&p_lock->lock);
> +	status = (unsigned) pthread_rwlock_rdlock(&p_lock->lock);
>   	CL_ASSERT(status == 0);
>   }
>
> @@ -271,7 +271,7 @@ static inline void cl_plock_excl_acquire(IN cl_plock_t * const p_lock)
>   	CL_ASSERT(p_lock);
>   	CL_ASSERT(p_lock->state == CL_INITIALIZED);
>
> -	status = (cl_status_t) pthread_rwlock_wrlock(&p_lock->lock);
> +	status = (unsigned) pthread_rwlock_wrlock(&p_lock->lock);
>   	CL_ASSERT(status == 0);
>   }
>
> @@ -303,7 +303,7 @@ static inline void cl_plock_release(IN cl_plock_t * const p_lock)
>   	CL_ASSERT(p_lock);
>   	CL_ASSERT(p_lock->state == CL_INITIALIZED);
>
> -	status = (cl_status_t) pthread_rwlock_unlock(&p_lock->lock);
> +	status = (unsigned) pthread_rwlock_unlock(&p_lock->lock);
>   	CL_ASSERT(status == 0);
>   }
>

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