NAME¶

rtapi_div_u64 - unsigned division of a 64-bit number by a 32-bit number

SYNTAX¶

__u64 rtapi_div_u64_rem(__u64 dividend, __u32 divisor, __u32 *remainder)

__u64 rtapi_div_u64(__u64 dividend, __u32 divisor)

__s64 rtapi_div_s64(__s64 dividend, __s32 divisor)

__s64 rtapi_div_s64_rem(__s64 dividend, __s32 divisor, __s32 *remainder)

ARGUMENTS¶

dividend

The value to be divided

divisor

The value to divide by

remainder

Pointer to the location to store the remainder. This may not be a NULL pointer. If the remainder is not desired, call rtapi_div_u64 or rtapi_div_s64.

DESCRIPTION¶

Perform integer division (and optionally compute the remainder) with a 64-bit dividend and 32-bit divisor.

RETURN VALUE¶

The result of integer division of dividend / divisor. In versions with the remainder argument, the remainder is stored in the pointed-to location.

NOTES¶

If the result of the division does not fit in the return type, the result is undefined.

This function exists because in kernel space the use of the division operator on a 64-bit type can lead to an undefined symbol such as __umoddi3 when the module is loaded.

REALTIME CONSIDERATIONS¶

May be called from init/cleanup code and from within realtime tasks. Available in non-realtime components.