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linux/kernel.h: import DIV_ROUND_CLOSEST_ULL from Linux

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Copied from Linux v4.20-rc7.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2018-12-19 20:03:16 +09:00
parent ce480791f7
commit b32aa9ebc5
1 changed files with 12 additions and 0 deletions
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12
include/linux/kernel.h
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@ -102,6 +102,18 @@
(((__x) - ((__d) / 2)) / (__d)); \ (((__x) - ((__d) / 2)) / (__d)); \
} \ } \
) )
/*
* Same as above but for u64 dividends. divisor must be a 32-bit
* number.
*/
#define DIV_ROUND_CLOSEST_ULL(x, divisor)( \
{ \
typeof(divisor) __d = divisor; \
unsigned long long _tmp = (x) + (__d) / 2; \
do_div(_tmp, __d); \
_tmp; \
} \
)
/* /*
* Multiplies an integer by a fraction, while avoiding unnecessary * Multiplies an integer by a fraction, while avoiding unnecessary