From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed, 22 Feb 2023 17:52:32 +0000 (-0800)
Subject: bpf: add missing header file include
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=49ce63694caed972e96d07cb4fa0eb19f39b95d7;p=linux.git

bpf: add missing header file include

commit f3dd0c53370e70c0f9b7e931bbec12916f3bb8cc upstream.

Commit 74e19ef0ff80 ("uaccess: Add speculation barrier to
copy_from_user()") built fine on x86-64 and arm64, and that's the extent
of my local build testing.

It turns out those got the <linux/nospec.h> include incidentally through
other header files (<linux/kvm_host.h> in particular), but that was not
true of other architectures, resulting in build errors

  kernel/bpf/core.c: In function ‘___bpf_prog_run’:
  kernel/bpf/core.c:1913:3: error: implicit declaration of function ‘barrier_nospec’

so just make sure to explicitly include the proper <linux/nospec.h>
header file to make everybody see it.

Fixes: 74e19ef0ff80 ("uaccess: Add speculation barrier to copy_from_user()")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Viresh Kumar <viresh.kumar@linaro.org>
Reported-by: Huacai Chen <chenhuacai@loongson.cn>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 25bcb8a50eaac..cea0d1296599c 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -32,6 +32,7 @@
 #include <linux/perf_event.h>
 #include <linux/extable.h>
 #include <linux/log2.h>
+#include <linux/nospec.h>
 
 #include <asm/barrier.h>
 #include <asm/unaligned.h>