This eliminates the workaround that requires disabling -mprofile-kernel by default in Kconfig. [ Note: this depends on https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git kconfig-shell-v3 ] Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx> --- arch/powerpc/Kconfig | 16 +--------------- arch/powerpc/Makefile | 14 ++------------ arch/powerpc/tools/gcc-check-mprofile-kernel.sh | 4 ++-- 3 files changed, 5 insertions(+), 29 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 512fcc177c87..af527f894f9b 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -460,23 +460,9 @@ config LD_HEAD_STUB_CATCH If unsure, say "N". -config DISABLE_MPROFILE_KERNEL - bool "Disable use of mprofile-kernel for kernel tracing" - depends on PPC64 && CPU_LITTLE_ENDIAN - default y - help - Selecting this options disables use of the mprofile-kernel ABI for - kernel tracing. That will cause options such as live patching - (CONFIG_LIVEPATCH) which depend on CONFIG_DYNAMIC_FTRACE_WITH_REGS to - be disabled also. - - If you have a toolchain which supports mprofile-kernel, then you can - disable this. Otherwise leave it enabled. If you're not sure, say - "Y". - config MPROFILE_KERNEL depends on PPC64 && CPU_LITTLE_ENDIAN - def_bool !DISABLE_MPROFILE_KERNEL + def_bool $(success $(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__) config IOMMU_HELPER def_bool PPC64 diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 6faf1d6ad9dd..8f7a64fe7370 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -161,18 +161,8 @@ CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64 endif ifdef CONFIG_MPROFILE_KERNEL - ifeq ($(shell $(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -I$(srctree)/include -D__KERNEL__),OK) - CC_FLAGS_FTRACE := -pg -mprofile-kernel - KBUILD_CPPFLAGS += -DCC_USING_MPROFILE_KERNEL - else - # If the user asked for mprofile-kernel but the toolchain doesn't - # support it, emit a warning and deliberately break the build later - # with mprofile-kernel-not-supported. We would prefer to make this an - # error right here, but then the user would never be able to run - # oldconfig to change their configuration. - $(warning Compiler does not support mprofile-kernel, set CONFIG_DISABLE_MPROFILE_KERNEL) - CC_FLAGS_FTRACE := -mprofile-kernel-not-supported - endif + CC_FLAGS_FTRACE := -pg -mprofile-kernel + KBUILD_CPPFLAGS += -DCC_USING_MPROFILE_KERNEL endif CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell) diff --git a/arch/powerpc/tools/gcc-check-mprofile-kernel.sh b/arch/powerpc/tools/gcc-check-mprofile-kernel.sh index 061f8035bdbe..ec4486a9c4a3 100755 --- a/arch/powerpc/tools/gcc-check-mprofile-kernel.sh +++ b/arch/powerpc/tools/gcc-check-mprofile-kernel.sh @@ -10,13 +10,13 @@ set -o pipefail # Test whether the compile option -mprofile-kernel exists and generates # profiling code (ie. a call to _mcount()). echo "int func() { return 0; }" | \ - $* -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \ + $* -m64 -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \ grep -q "_mcount" # Test whether the notrace attribute correctly suppresses calls to _mcount(). echo -e "#include <linux/compiler.h>\nnotrace int func() { return 0; }" | \ - $* -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \ + $* -m64 -S -x c -O2 -p -mprofile-kernel - -o - 2> /dev/null | \ grep -q "_mcount" && \ exit 1 -- 2.17.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
