This is a note to let you know that I've just added the patch titled
arm64: Make CPU_BIG_ENDIAN depend on ld.bfd or ld.lld 13.0.0+
to the 5.4-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:
arm64-make-cpu_big_endian-depend-on-ld.bfd-or-ld.lld.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3012012bdce962b1e725e342cc20b11244403591
Author: Nathan Chancellor <nathan@xxxxxxxxxx>
Date: Mon Feb 8 17:57:20 2021 -0700
arm64: Make CPU_BIG_ENDIAN depend on ld.bfd or ld.lld 13.0.0+
[ Upstream commit e9c6deee00e9197e75cd6aa0d265d3d45bd7cc28 ]
Similar to commit 28187dc8ebd9 ("ARM: 9025/1: Kconfig: CPU_BIG_ENDIAN
depends on !LD_IS_LLD"), ld.lld prior to 13.0.0 does not properly
support aarch64 big endian, leading to the following build error when
CONFIG_CPU_BIG_ENDIAN is selected:
ld.lld: error: unknown emulation: aarch64linuxb
This has been resolved in LLVM 13. To avoid errors like this, only allow
CONFIG_CPU_BIG_ENDIAN to be selected if using ld.bfd or ld.lld 13.0.0
and newer.
While we are here, the indentation of this symbol used spaces since its
introduction in commit a872013d6d03 ("arm64: kconfig: allow
CPU_BIG_ENDIAN to be selected"). Change it to tabs to be consistent with
kernel coding style.
Link: https://github.com/ClangBuiltLinux/linux/issues/380
Link: https://github.com/ClangBuiltLinux/linux/issues/1288
Link: https://github.com/llvm/llvm-project/commit/7605a9a009b5fa3bdac07e3131c8d82f6d08feb7
Link: https://github.com/llvm/llvm-project/commit/eea34aae2e74e9b6fbdd5b95f479bc7f397bf387
Reported-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210209005719.803608-1-nathan@xxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Stable-dep-of: 146a15b87335 ("arm64: Restrict CPU_BIG_ENDIAN to GNU as or LLVM IAS 15.x or newer")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 185262e0e1da3..306772b7de5fc 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -886,8 +886,9 @@ choice
that is selected here.
config CPU_BIG_ENDIAN
- bool "Build big-endian kernel"
- help
+ bool "Build big-endian kernel"
+ depends on !LD_IS_LLD || LLD_VERSION >= 130000
+ help
Say Y if you plan on running a kernel with a big-endian userspace.
config CPU_LITTLE_ENDIAN
