Patch "arm64: Make CPU_BIG_ENDIAN depend on ld.bfd or ld.lld 13.0.0+" has been added to the 4.19-stable tree

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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 4.19-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-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 354a6aad1bac79aafc40ddfabe5f0cdb119b00dc
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 04ff19aa948a1..92646f12a66d2 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -757,8 +757,9 @@ 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



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