Am Mittwoch, den 24.10.2012, 11:41 +0800 schrieb Wei Yang:
> In kfifo_in marco, one piece of code which is arounded by if(0) will check the
> type of __tmp->ptr_const and __buf. If they are different type, there will
> output a warning during compiling. This piece of code is not self explaining
> and a little bit hard to understand.
>
> Based on Andrew Morton's suggestion, this patch replace this with typecheck()
> which will be easy to understand.
>
> In the same file, there are several places with the same code style. This
> patch change them too.
>
> Signed-off-by: Wei Yang <weiy...@linux.vnet.ibm.com>
> Reviewed-by: Andrew Morton <a...@linux-foundation.org>
> Reviewed-by: richard -rw- weinberger <richard.weinber...@gmail.com>
> ---
> include/linux/kfifo.h | 22 +++++-----------------
> 1 files changed, 5 insertions(+), 17 deletions(-)
>
> diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h
> index 10308c6..680c293 100644
> --- a/include/linux/kfifo.h
> +++ b/include/linux/kfifo.h
> @@ -390,10 +390,7 @@ __kfifo_int_must_check_helper( \
> unsigned int __ret; \
> const size_t __recsize = sizeof(*__tmp->rectype); \
> struct __kfifo *__kfifo = &__tmp->kfifo; \
> - if (0) { \
> - typeof(__tmp->ptr_const) __dummy __attribute__ ((unused)); \
> - __dummy = (typeof(__val))NULL; \
> - } \
> + typecheck(typeof(__tmp->ptr_const), __val); \
> if (__recsize) \
> __ret = __kfifo_in_r(__kfifo, __val, sizeof(*__val), \
> __recsize); \
> @@ -433,7 +430,7 @@ __kfifo_uint_must_check_helper( \
> const size_t __recsize = sizeof(*__tmp->rectype); \
> struct __kfifo *__kfifo = &__tmp->kfifo; \
> if (0) \
> - __val = (typeof(__tmp->ptr))0; \
> + __val = (typeof(__tmp->ptr))NULL; \
> if (__recsize) \
> __ret = __kfifo_out_r(__kfifo, __val, sizeof(*__val), \
> __recsize); \
> @@ -512,10 +509,7 @@ __kfifo_uint_must_check_helper( \
> unsigned long __n = (n); \
> const size_t __recsize = sizeof(*__tmp->rectype); \
> struct __kfifo *__kfifo = &__tmp->kfifo; \
> - if (0) { \
> - typeof(__tmp->ptr_const) __dummy __attribute__ ((unused)); \
> - __dummy = (typeof(__buf))NULL; \
> - } \
> + typecheck(typeof(__tmp->ptr_const), __buf);\
> (__recsize) ?\
> __kfifo_in_r(__kfifo, __buf, __n, __recsize) : \
> __kfifo_in(__kfifo, __buf, __n); \
> @@ -565,10 +559,7 @@ __kfifo_uint_must_check_helper( \
> unsigned long __n = (n); \
> const size_t __recsize = sizeof(*__tmp->rectype); \
> struct __kfifo *__kfifo = &__tmp->kfifo; \
> - if (0) { \
> - typeof(__tmp->ptr) __dummy = NULL; \
> - __buf = __dummy; \
> - } \
> + typecheck(typeof(__tmp->ptr), __buf); \
> (__recsize) ?\
> __kfifo_out_r(__kfifo, __buf, __n, __recsize) : \
> __kfifo_out(__kfifo, __buf, __n); \
> @@ -777,10 +768,7 @@ __kfifo_uint_must_check_helper( \
> unsigned long __n = (n); \
> const size_t __recsize = sizeof(*__tmp->rectype); \
> struct __kfifo *__kfifo = &__tmp->kfifo; \
> - if (0) { \
> - typeof(__tmp->ptr) __dummy __attribute__ ((unused)) = NULL; \
> - __buf = __dummy; \
> - } \
> + typecheck(typeof(__tmp->ptr), __buf); \
> (__recsize) ? \
> __kfifo_out_peek_r(__kfifo, __buf, __n, __recsize) : \
> __kfifo_out_peek(__kfifo, __buf, __n); \
Acked-by: Stefani Seibold <stef...@seibold.net>
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