linux-kernel - [PATCH] bpf: Fix undeclared function 'barrier

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Date:   Wed, 22 Feb 2023 13:54:31 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] bpf: Fix undeclared function 'barrier_nospec' warning

Add the missing header for architectures that don't define
the barrier_nospec() macro. The nospec.h header is added after the
inclusion of barrier.h to avoid redefining the macro for architectures
that already define barrier_nospec() in their respective barrier.h
headers.

Fixes: 74e19ef0ff80 ("uaccess: Add speculation barrier to copy_from_user()")
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
Linus's master branch fails currently to build for arm64 without this commit.

 kernel/bpf/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 933869983e2a..92aeb388e422 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -38,6 +38,8 @@
 #include <linux/memcontrol.h>
 
 #include <asm/barrier.h>
+#include <linux/nospec.h>
+
 #include <asm/unaligned.h>
 
 /* Registers */
-- 
2.31.1.272.g89b43f80a514