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

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>

diff --git a/arch/riscv/lib/delay.c b/arch/riscv/lib/delay.c
index 87ff89e88f2ca95bfc1fb47e10e0cb7e88b0880a..f51c9a03bca1e7ca4c71faecba4c2e4b5f9e0d65 100644 (file)
--- a/arch/riscv/lib/delay.c
+++ b/arch/riscv/lib/delay.c
@@ -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;
        }