Messages in this thread Patch in this message | | | Subject | [PATCH 01/10] Add macros similar to min/max/min_t/max_t. | From | Harvey Harrison <> | Date | Thu, 13 Mar 2008 22:18:45 -0700 |
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Also, change the variable names used in the min/max macros to avoid shadowed variable warnings when min/max min_t/max_t are nested.
Small formatting changes to make all the macros have a similar form.
[akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix v4l build] Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> --- Andrew, I'll send you an incremental patch for the patch in -mm, this is just so people can see the final form/users.
drivers/media/video/bt8xx/bttvp.h | 2 - drivers/media/video/usbvideo/vicam.c | 6 --- include/linux/kernel.h | 63 ++++++++++++++++++++++++---------- 3 files changed, 45 insertions(+), 26 deletions(-)
diff --git a/drivers/media/video/bt8xx/bttvp.h b/drivers/media/video/bt8xx/bttvp.h index 1305d31..b38e3a0 100644 --- a/drivers/media/video/bt8xx/bttvp.h +++ b/drivers/media/video/bt8xx/bttvp.h @@ -82,8 +82,6 @@ /* Limits scaled width, which must be a multiple of 4. */ #define MAX_HACTIVE (0x3FF & -4) -#define clamp(x, low, high) min (max (low, x), high) - #define BTTV_NORMS (\ V4L2_STD_PAL | V4L2_STD_PAL_N | \ V4L2_STD_PAL_Nc | V4L2_STD_SECAM | \ diff --git a/drivers/media/video/usbvideo/vicam.c b/drivers/media/video/usbvideo/vicam.c index da1ba02..938a60d 100644 --- a/drivers/media/video/usbvideo/vicam.c +++ b/drivers/media/video/usbvideo/vicam.c @@ -70,12 +70,6 @@ #define VICAM_HEADER_SIZE 64 -#define clamp( x, l, h ) max_t( __typeof__( x ), \ - ( l ), \ - min_t( __typeof__( x ), \ - ( h ), \ - ( x ) ) ) - /* Not sure what all the bytes in these char * arrays do, but they're necessary to make * the camera work. diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 2df44e7..c74460c 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -335,33 +335,60 @@ static inline int __attribute__ ((format (printf, 1, 2))) pr_debug(const char * #endif /* __LITTLE_ENDIAN */ /* - * min()/max() macros that also do + * min()/max()/clamp() macros that also do * strict type-checking.. See the * "unnecessary" pointer comparison. */ -#define min(x,y) ({ \ - typeof(x) _x = (x); \ - typeof(y) _y = (y); \ - (void) (&_x == &_y); \ - _x < _y ? _x : _y; }) - -#define max(x,y) ({ \ - typeof(x) _x = (x); \ - typeof(y) _y = (y); \ - (void) (&_x == &_y); \ - _x > _y ? _x : _y; }) +#define min(x, y) ({ \ + typeof(x) _min1 = (x); \ + typeof(y) _min2 = (y); \ + (void) (&_min1 == &_min2); \ + _min1 < _min2 ? _min1 : _min2; }) + +#define max(x, y) ({ \ + typeof(x) _max1 = (x); \ + typeof(y) _max2 = (y); \ + (void) (&_max1 == &_max2); \ + _max1 > _max2 ? _max1 : _max2; }) + +#define clamp(val, min, max) ({ \ + typeof(val) __val = (val); \ + typeof(min) __min = (min); \ + typeof(max) __max = (max); \ + (void) (&__val == &__min); \ + (void) (&__val == &__max); \ + __val = __val < __min ? __min: __val; \ + __val > __max ? __max: __val; }) /* * ..and if you can't take the strict * types, you can specify one yourself. * - * Or not use min/max at all, of course. + * Or not use min/max/clamp at all, of course. */ -#define min_t(type,x,y) \ - ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) -#define max_t(type,x,y) \ - ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; }) - +#define min_t(type, x, y) ({ \ + type __min1 = (x); \ + type __min2 = (y); \ + __min1 < __min2 ? __min1: __min2; }) + +#define max_t(type, x, y) ({ \ + type __max1 = (x); \ + type __max2 = (y); \ + __max1 > __max2 ? __max1: __max2; }) + +#define clamp_t(type, val, min, max) ({ \ + type __val = (val); \ + type __min = (min); \ + type __max = (max); \ + __val = __val < __min ? __min: __val; \ + __val > __max ? __max: __val; }) + +#define clamp_val(val, min, max) ({ \ + typeof(val) __val = (val); \ + typeof(val) __min = (min); \ + typeof(val) __max = (max); \ + __val = __val < __min ? __min: __val; \ + __val > __max ? __max: __val; }) /** * container_of - cast a member of a structure out to the containing structure -- 1.5.4.4.653.g7cf1e
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