This is a note to let you know that I've just added the patch titled
wireguard: do not use -O3
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wireguard-do-not-use-o3.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cc5060ca0285efe2728bced399a1955a7ce808b2 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Date: Fri, 4 Jun 2021 17:17:32 +0200
Subject: wireguard: do not use -O3
From: Jason A. Donenfeld <Jason@xxxxxxxxx>
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@xxxxxxxxxxxxxx/
Link: https://lore.kernel.org/lkml/CAHmME9otB5Wwxp7H8bR_i2uH2esEMvoBMC8uEXBMH9p0q1s6Bw@xxxxxxxxxxxxxx/
Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
Patches currently in stable-queue which might be from Jason@xxxxxxxxx are
queue-5.10/wireguard-use-synchronize_net-rather-than-synchronize_rcu.patch
queue-5.10/wireguard-do-not-use-o3.patch
queue-5.10/wireguard-allowedips-allocate-nodes-in-kmem_cache.patch
queue-5.10/wireguard-allowedips-initialize-list-head-in-selftest.patch
queue-5.10/wireguard-selftests-remove-old-conntrack-kconfig-value.patch
queue-5.10/wireguard-peer-allocate-in-kmem_cache.patch
queue-5.10/wireguard-allowedips-remove-nodes-in-o-1.patch
queue-5.10/wireguard-selftests-make-sure-rp_filter-is-disabled-on-vethc.patch
queue-5.10/wireguard-allowedips-free-empty-intermediate-nodes-when-removing-single-node.patch
