diff options
| author | Cristian Ciocaltea <cristian.ciocaltea@collabora.com> | 2026-03-03 22:24:17 +0300 |
|---|---|---|
| committer | Daniel Stone <daniels@collabora.com> | 2026-03-18 12:59:57 +0300 |
| commit | de9e2b3d88af36411301c049a1b049f3e4fe0757 (patch) | |
| tree | df5effb1776ac5d1dad7b5c1dc0ddb15e5aab04f /include/uapi/linux | |
| parent | 25854131c04a5aa25a41cf527aab269aadb86699 (diff) | |
| download | linux-de9e2b3d88af36411301c049a1b049f3e4fe0757.tar.xz | |
uapi: Provide DIV_ROUND_CLOSEST()
Currently DIV_ROUND_CLOSEST() is only available for the kernel via
include/linux/math.h.
Expose it to userland as well by adding __KERNEL_DIV_ROUND_CLOSEST() as
a common definition in uapi.
Additionally, ensure it allows building ISO C applications by switching
from the 'typeof' GNU extension to the ISO-friendly __typeof__.
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Tested-by: Diederik de Haas <diederik@cknow-tech.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://patch.msgid.link/20260303-rk3588-bgcolor-v8-1-fee377037ad1@collabora.com
Signed-off-by: Daniel Stone <daniels@collabora.com>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/const.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/uapi/linux/const.h b/include/uapi/linux/const.h index b8f629ef135f..565f309b9df8 100644 --- a/include/uapi/linux/const.h +++ b/include/uapi/linux/const.h @@ -50,4 +50,22 @@ #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) +/* + * Divide positive or negative dividend by positive or negative divisor + * and round to closest integer. Result is undefined for negative + * divisors if the dividend variable type is unsigned and for negative + * dividends if the divisor variable type is unsigned. + */ +#define __KERNEL_DIV_ROUND_CLOSEST(x, divisor) \ +({ \ + __typeof__(x) __x = x; \ + __typeof__(divisor) __d = divisor; \ + \ + (((__typeof__(x))-1) > 0 || \ + ((__typeof__(divisor))-1) > 0 || \ + (((__x) > 0) == ((__d) > 0))) ? \ + (((__x) + ((__d) / 2)) / (__d)) : \ + (((__x) - ((__d) / 2)) / (__d)); \ +}) + #endif /* _UAPI_LINUX_CONST_H */ |