Unverified Commit adebc881 authored by Nathan Chancellor's avatar Nathan Chancellor Committed by Palmer Dabbelt
Browse files

riscv: Select HAVE_DYNAMIC_FTRACE when -fpatchable-function-entry is available 

clang prior to 13.0.0 does not support -fpatchable-function-entry for
RISC-V.

clang: error: unsupported option '-fpatchable-function-entry=8' for target 'riscv64-unknown-linux-gnu'

To avoid this error, only select HAVE_DYNAMIC_FTRACE when this option is
not available.

Fixes: afc76b8b ("riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT")
Link: https://github.com/ClangBuiltLinux/linux/issues/1268


Reported-by: default avatarkernel test robot <lkp@intel.com>
Signed-off-by: default avatarNathan Chancellor <nathan@kernel.org>
Reviewed-by: default avatarFangrui Song <maskray@google.com>
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent 7ce04771

arch/riscv/Kconfig

+1 −1
Original line number Original line Diff line number Diff line
@@ -231,7 +231,7 @@ config ARCH_RV64I 
	bool "RV64I"

	bool "RV64I"

	select 64BIT

	select 64BIT

	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000

	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && GCC_VERSION >= 50000

	select HAVE_DYNAMIC_FTRACE if MMU

	select HAVE_DYNAMIC_FTRACE if MMU && $(cc-option,-fpatchable-function-entry=8)

	select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE

	select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE

	select HAVE_FTRACE_MCOUNT_RECORD

	select HAVE_FTRACE_MCOUNT_RECORD

	select HAVE_FUNCTION_GRAPH_TRACER

	select HAVE_FUNCTION_GRAPH_TRACER