[PATCH 5.10 080/137] wireguard: do not use -O3
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2021-06-08 19:09:04
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From: Jason A. Donenfeld <Jason@zx2c4.com> commit cc5060ca0285efe2728bced399a1955a7ce808b2 upstream. Apparently, various versions of gcc have O3-related miscompiles. Looking at the difference between -O2 and -O3 for gcc 11 doesn't indicate miscompiles, but the difference also doesn't seem so significant for performance that it's worth risking. Link: https://lore.kernel.org/lkml/CAHk-=wjuoGyxDhAF8SsrTkN0-YfCx7E6jUN3ikC_tn2AKWTTsA@mail.gmail.com/ (local) Link: https://lore.kernel.org/lkml/CAHmME9otB5Wwxp7H8bR_i2uH2esEMvoBMC8uEXBMH9p0q1s6Bw@mail.gmail.com/ (local) Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") Cc: stable@vger.kernel.org Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/net/wireguard/Makefile | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/net/wireguard/Makefile
+++ b/drivers/net/wireguard/Makefile@@ -1,5 +1,4 @@ -ccflags-y := -O3 -ccflags-y += -D'pr_fmt(fmt)=KBUILD_MODNAME ": " fmt' +ccflags-y := -D'pr_fmt(fmt)=KBUILD_MODNAME ": " fmt' ccflags-$(CONFIG_WIREGUARD_DEBUG) += -DDEBUG wireguard-y := main.o wireguard-y += noise.o