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| author | Cristian Ciocaltea <cristian.ciocaltea@collabora.com> | 2026-03-03 21:24:17 +0200 |
|---|---|---|
| committer | Daniel Stone <daniels@collabora.com> | 2026-03-18 09:59:57 +0000 |
| commit | de9e2b3d88af36411301c049a1b049f3e4fe0757 (patch) | |
| tree | df5effb1776ac5d1dad7b5c1dc0ddb15e5aab04f /include/linux | |
| parent | 25854131c04a5aa25a41cf527aab269aadb86699 (diff) | |
| download | lwn-de9e2b3d88af36411301c049a1b049f3e4fe0757.tar.gz lwn-de9e2b3d88af36411301c049a1b049f3e4fe0757.zip | |
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/linux')
| -rw-r--r-- | include/linux/math.h | 18 |
1 files changed, 1 insertions, 17 deletions
diff --git a/include/linux/math.h b/include/linux/math.h index 6dc1d1d32fbc..1e8fb3efbc8c 100644 --- a/include/linux/math.h +++ b/include/linux/math.h @@ -89,23 +89,7 @@ } \ ) -/* - * 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 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)); \ -} \ -) +#define DIV_ROUND_CLOSEST __KERNEL_DIV_ROUND_CLOSEST /* * Same as above but for u64 dividends. divisor must be a 32-bit * number. |