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riscv: delay: use do_div() instead of __udivdi3()

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In preparation for removing __udivdi3() from the RISC-V
architecture-specific files, convert its one user to use do_div().
This avoids breaking the RV32 build after __udivdi3() is removed.

This second version removes the assignment of the remainder to an
unused temporary variable.  Thanks to Nicolas Pitre <nico@fluxnic.net>
for the suggestion.

Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Nicolas Pitre <nico@fluxnic.net>
This commit is contained in:
Paul Walmsley 2019-08-06 18:28:33 -07:00
parent 94ed3fde38
commit 66cc016ab7
1 changed files with 5 additions and 1 deletions
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6
arch/riscv/lib/delay.c
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@ -81,9 +81,13 @@ EXPORT_SYMBOL(__delay);
void udelay(unsigned long usecs)
{
u64 ucycles = (u64)usecs * lpj_fine * UDELAY_MULT;
u64 n;
if (unlikely(usecs > MAX_UDELAY_US)) {
__delay((u64)usecs * riscv_timebase / 1000000ULL);
n = (u64)usecs * riscv_timebase;
do_div(n, 1000000);
__delay(n);
return;
}