From f7584322e4fef794b290e5fdb290fa92a925236e Mon Sep 17 00:00:00 2001 From: Nick Desaulniers Date: Fri, 23 Jun 2023 10:06:17 -0700 Subject: [PATCH] riscv: disable HAVE_LD_DEAD_CODE_DATA_ELIMINATION for LLD 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 Suggested-by: Nathan Chancellor Signed-off-by: Nick Desaulniers Signed-off-by: Palmer Dabbelt --- arch/riscv/Kconfig | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 62e84fee2cfd..a8a9387eb284 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -115,7 +115,8 @@ config RISCV select HAVE_KPROBES if !XIP_KERNEL select HAVE_KPROBES_ON_FTRACE 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_PUD select HAVE_PCI