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ARM: 9289/1: Allow pre-ARMv5 builds with ld.lld 16.0.0 and newer

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Commit 6a7ee50f8f ("ARM: disallow pre-ARMv5 builds with ld.lld")
prevented v4 or v4t kernels when ld.lld will link the kernel due to
inserting unsupported blx instructions.

ld.lld has been fixed in current main (16.0.0) to avoid inserting these
instructions by inserting position independent thunks instead. Allow
these configurations to be enabled when ld.lld 16.0.0 is used to link
the kernel.

Additionally, add a link to the upstream LLVM issue so that the reason
for this dependency is clearly documented.

Link: https://github.com/ClangBuiltLinux/linux/issues/964
Link: 6f9ff1beee

Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Nathan Chancellor 2023-01-29 15:49:07 +01:00 • committed by Russell King (Oracle)
parent cfb1076d15
commit 5eb6e28043
1 changed files with 4 additions and 2 deletions
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6
arch/arm/Kconfig
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@ -345,14 +345,16 @@ comment "CPU Core family selection"
config ARCH_MULTI_V4 config ARCH_MULTI_V4
bool "ARMv4 based platforms (FA526, StrongARM)" bool "ARMv4 based platforms (FA526, StrongARM)"
depends on !ARCH_MULTI_V6_V7 depends on !ARCH_MULTI_V6_V7
depends on !LD_IS_LLD # https://github.com/llvm/llvm-project/issues/50764
depends on !LD_IS_LLD || LLD_VERSION >= 160000
select ARCH_MULTI_V4_V5 select ARCH_MULTI_V4_V5
select CPU_FA526 if !(CPU_SA110 || CPU_SA1100) select CPU_FA526 if !(CPU_SA110 || CPU_SA1100)
config ARCH_MULTI_V4T config ARCH_MULTI_V4T
bool "ARMv4T based platforms (ARM720T, ARM920T, ...)" bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
depends on !ARCH_MULTI_V6_V7 depends on !ARCH_MULTI_V6_V7
depends on !LD_IS_LLD # https://github.com/llvm/llvm-project/issues/50764
depends on !LD_IS_LLD || LLD_VERSION >= 160000
select ARCH_MULTI_V4_V5 select ARCH_MULTI_V4_V5
select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \ select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \ CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \