b1b85d02cb
The vDSO library should only include the necessary headers required for a userspace library (UAPI and a minimal set of kernel headers). To make this possible it is necessary to isolate from the kernel headers the common parts that are strictly necessary to build the library. Split math64.h into linux and common headers to make the latter suitable for inclusion in the vDSO library. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20200320145351.32292-10-vincenzo.frascino@arm.com (cherry picked from commit b874b8358c756f2503c55686af842d99f5b1f312) Signed-off-by: Mark Salyzyn <salyzyn@google.com> Bug: 154668398 Change-Id: I5d15f64ab32e1c9630d64dc5dc446d666bbf0bc1
24 lines
468 B
C
24 lines
468 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __VDSO_MATH64_H
|
|
#define __VDSO_MATH64_H
|
|
|
|
static __always_inline u32
|
|
__iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder)
|
|
{
|
|
u32 ret = 0;
|
|
|
|
while (dividend >= divisor) {
|
|
/* The following asm() prevents the compiler from
|
|
optimising this loop into a modulo operation. */
|
|
asm("" : "+rm"(dividend));
|
|
|
|
dividend -= divisor;
|
|
ret++;
|
|
}
|
|
|
|
*remainder = dividend;
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* __VDSO_MATH64_H */
|