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riscv: disable HAVE_LD_DEAD_CODE_DATA_ELIMINATION for LLD

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Linking allyesconfig with ld.lld-17 with CONFIG_DEAD_CODE_ELIMINATION=y
takes hours.  Assuming this is a performance regression that can be
fixed, tentatively disable this for now so that allyesconfig builds
don't start timing out.  If and when there's a fix to ld.lld, this can
be converted to a version check instead so that users of older but still
supported versions of ld.lld don't hurt themselves by enabling
CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y.

Link: https://github.com/ClangBuiltLinux/linux/issues/1881
Link: https://lore.kernel.org/linux-riscv/ZJXTwqZIkXLxXaSi@google.com/
Reported-by: Palmer Dabbelt <palmer@dabbelt.com>
Suggested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Nick Desaulniers 2023-06-23 10:06:17 -07:00 committed by Palmer Dabbelt
parent c828856b51
commit f7584322e4
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1 changed files with 2 additions and 1 deletions
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arch/riscv/Kconfig
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@ -115,7 +115,8 @@ config RISCV
select HAVE_KPROBES if !XIP_KERNEL select HAVE_KPROBES if !XIP_KERNEL
select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL
select HAVE_KRETPROBES if !XIP_KERNEL select HAVE_KRETPROBES if !XIP_KERNEL
select HAVE_LD_DEAD_CODE_DATA_ELIMINATION # https://github.com/ClangBuiltLinux/linux/issues/1881
select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if !LD_IS_LLD
select HAVE_MOVE_PMD select HAVE_MOVE_PMD
select HAVE_MOVE_PUD select HAVE_MOVE_PUD
select HAVE_PCI select HAVE_PCI