MPILIB: Provide count_leading/trailing_zeros() based on arch functions

Provide count_leading/trailing_zeros() macros based on extant arch bit scanning
functions rather than reimplementing from scratch in MPILIB.

Whilst we're at it, turn count_foo_zeros(n, x) into n = count_foo_zeros(x).

Also move the definition to asm-generic as other people may be interested in
using it.

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Cc: Arnd Bergmann <arnd@arndb.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/mpi/mpi-bit.c b/lib/mpi/mpi-bit.c
index 568724804f29..503537e08436 100644
--- a/lib/mpi/mpi-bit.c
+++ b/lib/mpi/mpi-bit.c
@@ -45,7 +45,7 @@ unsigned mpi_get_nbits(MPI a)
         if (a->nlimbs) {
                 mpi_limb_t alimb = a->d[a->nlimbs - 1];
                 if (alimb)
-                        count_leading_zeros(n, alimb);
+                        n = count_leading_zeros(alimb);
                 else
                         n = BITS_PER_MPI_LIMB;
                 n = BITS_PER_MPI_LIMB - n + (a->nlimbs - 1) * BITS_PER_MPI_LIMB;