The patch titled
Subject: kbuild: avoid static_assert for genksyms
has been added to the -mm tree. Its filename is
kbuild-avoid-static_assert-for-genksyms.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kbuild-avoid-static_assert-for-genksyms.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kbuild-avoid-static_assert-for-genksyms.patch
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------------------------------------------------------
From: Arnd Bergmann <arnd@xxxxxxxxxx>
Subject: kbuild: avoid static_assert for genksyms
genksyms does not know or care about the _Static_assert() built-in,
and sometimes falls back to ignoring the later symbols, which causes
undefined behavior such as
WARNING: modpost: EXPORT symbol "ethtool_set_ethtool_phy_ops" [vmlinux] version generation failed, symbol will not be versioned.
ld: net/ethtool/common.o: relocation R_AARCH64_ABS32 against `__crc_ethtool_set_ethtool_phy_ops' can not be used when making a shared object
net/ethtool/common.o:(_ftrace_annotated_branch+0x0): dangerous relocation: unsupported relocation
Redefine static_assert for genksyms to avoid that.
Link: https://lkml.kernel.org/r/20201203230955.1482058-1-arnd@xxxxxxxxxx
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Suggested-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Cc: Michal Marek <michal.lkml@xxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Rikard Falkeborn <rikard.falkeborn@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/build_bug.h | 5 +++++
1 file changed, 5 insertions(+)
--- a/include/linux/build_bug.h~kbuild-avoid-static_assert-for-genksyms
+++ a/include/linux/build_bug.h
@@ -77,4 +77,9 @@
#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
#define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
+#ifdef __GENKSYMS__
+/* genksyms gets confused by _Static_assert */
+#define _Static_assert(expr, ...)
+#endif
+
#endif /* _LINUX_BUILD_BUG_H */
_
Patches currently in -mm which might be from arnd@xxxxxxxxxx are
kbuild-avoid-static_assert-for-genksyms.patch
