target/linux/generic/backport-5.4/080-wireguard-0060-crypto-x86-curve25519-Remove-unused-carry-variables.patch

   1 From 9cfd2787b0b37940c656c6ea5fede6b3c360f0e5 Mon Sep 17 00:00:00 2001
   2 From: Herbert Xu <herbert@gondor.apana.org.au>
   3 Date: Thu, 23 Jul 2020 17:50:48 +1000
   4 Subject: [PATCH 060/124] crypto: x86/curve25519 - Remove unused carry
   5  variables
   6
   7 commit 054a5540fb8f7268e2c79e9deab4242db15c8cba upstream.
   8
   9 The carry variables are assigned but never used, which upsets
  10 the compiler.  This patch removes them.
  11
  12 Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
  13 Reviewed-by: Karthikeyan Bhargavan <karthik.bhargavan@gmail.com>
  14 Acked-by: Jason A. Donenfeld <Jason@zx2c4.com>
  15 Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
  16 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  17 ---
  18  arch/x86/crypto/curve25519-x86_64.c | 6 ++----
  19  1 file changed, 2 insertions(+), 4 deletions(-)
  20
  21 --- a/arch/x86/crypto/curve25519-x86_64.c
  22 +++ b/arch/x86/crypto/curve25519-x86_64.c
  23 @@ -948,10 +948,8 @@ static void store_felem(u64 *b, u64 *f)
  24  {
  25         u64 f30 = f[3U];
  26         u64 top_bit0 = f30 >> (u32)63U;
  27 -       u64 carry0;
  28         u64 f31;
  29         u64 top_bit;
  30 -       u64 carry;
  31         u64 f0;
  32         u64 f1;
  33         u64 f2;
  34 @@ -970,11 +968,11 @@ static void store_felem(u64 *b, u64 *f)
  35         u64 o2;
  36         u64 o3;
  37         f[3U] = f30 & (u64)0x7fffffffffffffffU;
  38 -       carry0 = add_scalar(f, f, (u64)19U * top_bit0);
  39 +       add_scalar(f, f, (u64)19U * top_bit0);
  40         f31 = f[3U];
  41         top_bit = f31 >> (u32)63U;
  42         f[3U] = f31 & (u64)0x7fffffffffffffffU;
  43 -       carry = add_scalar(f, f, (u64)19U * top_bit);
  44 +       add_scalar(f, f, (u64)19U * top_bit);
  45         f0 = f[0U];
  46         f1 = f[1U];
  47         f2 = f[2U];