target/linux/generic/backport-5.4/080-wireguard-0129-wireguard-do-not-use-O3.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: "Jason A. Donenfeld" <Jason@zx2c4.com>
   3 Date: Fri, 4 Jun 2021 17:17:32 +0200
   4 Subject: [PATCH] wireguard: do not use -O3
   5
   6 commit cc5060ca0285efe2728bced399a1955a7ce808b2 upstream.
   7
   8 Apparently, various versions of gcc have O3-related miscompiles. Looking
   9 at the difference between -O2 and -O3 for gcc 11 doesn't indicate
  10 miscompiles, but the difference also doesn't seem so significant for
  11 performance that it's worth risking.
  12
  13 Link: https://lore.kernel.org/lkml/CAHk-=wjuoGyxDhAF8SsrTkN0-YfCx7E6jUN3ikC_tn2AKWTTsA@mail.gmail.com/
  14 Link: https://lore.kernel.org/lkml/CAHmME9otB5Wwxp7H8bR_i2uH2esEMvoBMC8uEXBMH9p0q1s6Bw@mail.gmail.com/
  15 Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
  16 Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
  17 Cc: stable@vger.kernel.org
  18 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  19 Signed-off-by: David S. Miller <davem@davemloft.net>
  20 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  21 ---
  22  drivers/net/wireguard/Makefile | 3 +--
  23  1 file changed, 1 insertion(+), 2 deletions(-)
  24
  25 --- a/drivers/net/wireguard/Makefile
  26 +++ b/drivers/net/wireguard/Makefile
  27 @@ -1,5 +1,4 @@
  28 -ccflags-y := -O3
  29 -ccflags-y += -D'pr_fmt(fmt)=KBUILD_MODNAME ": " fmt'
  30 +ccflags-y := -D'pr_fmt(fmt)=KBUILD_MODNAME ": " fmt'
  31  ccflags-$(CONFIG_WIREGUARD_DEBUG) += -DDEBUG
  32  wireguard-y := main.o
  33  wireguard-y += noise.o