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 | 13 +------------ arch/powerpc/include/asm/module.h | 2 +- arch/powerpc/kernel/module_64.c | 4 ++-- arch/powerpc/kernel/trace/ftrace.c | 6 +++--- arch/powerpc/tools/gcc-check-mprofile-kernel.sh | 1 - 6 files changed, 8 insertions(+), 34 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 0cc41146bc51..736fe35a657d 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -461,23 +461,9 @@ 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..8eda91e0b8df 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -161,18 +161,7 @@ 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. - $(warning Compiler does not support mprofile-kernel, set CONFIG_DISABLE_MPROFILE_KERNEL) - CC_FLAGS_FTRACE := -mprofile-kernel-not-supported - endif + CC_FLAGS_FTRACE := -pg -mprofile-kernel endif CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell) diff --git a/arch/powerpc/include/asm/module.h b/arch/powerpc/include/asm/module.h index 4f6573934792..c38b125b7a57 100644 --- a/arch/powerpc/include/asm/module.h +++ b/arch/powerpc/include/asm/module.h @@ -14,7 +14,7 @@ #include <asm-generic/module.h> -#ifdef CC_USING_MPROFILE_KERNEL +#ifdef CONFIG_MPROFILE_KERNEL #define MODULE_ARCH_VERMAGIC_FTRACE "mprofile-kernel " #else #define MODULE_ARCH_VERMAGIC_FTRACE "" diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c index a2636c250b7b..55bccc315e1a 100644 --- a/arch/powerpc/kernel/module_64.c +++ b/arch/powerpc/kernel/module_64.c @@ -462,7 +462,7 @@ static unsigned long stub_for_addr(const Elf64_Shdr *sechdrs, return (unsigned long)&stubs[i]; } -#ifdef CC_USING_MPROFILE_KERNEL +#ifdef CONFIG_MPROFILE_KERNEL static bool is_early_mcount_callsite(u32 *instruction) { /* @@ -746,7 +746,7 @@ int apply_relocate_add(Elf64_Shdr *sechdrs, #ifdef CONFIG_DYNAMIC_FTRACE -#ifdef CC_USING_MPROFILE_KERNEL +#ifdef CONFIG_MPROFILE_KERNEL #define PACATOC offsetof(struct paca_struct, kernel_toc) diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c index 4741fe112f05..b2272308225a 100644 --- a/arch/powerpc/kernel/trace/ftrace.c +++ b/arch/powerpc/kernel/trace/ftrace.c @@ -144,7 +144,7 @@ __ftrace_make_nop(struct module *mod, return -EINVAL; } -#ifdef CC_USING_MPROFILE_KERNEL +#ifdef CONFIG_MPROFILE_KERNEL /* When using -mkernel_profile there is no load to jump over */ pop = PPC_INST_NOP; @@ -188,7 +188,7 @@ __ftrace_make_nop(struct module *mod, pr_err("Expected %08x found %08x\n", PPC_INST_LD_TOC, op); return -EINVAL; } -#endif /* CC_USING_MPROFILE_KERNEL */ +#endif /* CONFIG_MPROFILE_KERNEL */ if (patch_instruction((unsigned int *)ip, pop)) { pr_err("Patching NOP failed.\n"); @@ -324,7 +324,7 @@ int ftrace_make_nop(struct module *mod, * They should effectively be a NOP, and follow formal constraints, * depending on the ABI. Return false if they don't. */ -#ifndef CC_USING_MPROFILE_KERNEL +#ifndef CONFIG_MPROFILE_KERNEL static int expected_nop_sequence(void *ip, unsigned int op0, unsigned int op1) { diff --git a/arch/powerpc/tools/gcc-check-mprofile-kernel.sh b/arch/powerpc/tools/gcc-check-mprofile-kernel.sh index a7dd0e5d9f98..137f3376ac2b 100755 --- a/arch/powerpc/tools/gcc-check-mprofile-kernel.sh +++ b/arch/powerpc/tools/gcc-check-mprofile-kernel.sh @@ -24,5 +24,4 @@ echo -e "#include <linux/compiler.h>\nnotrace int func() { return 0; }" | \ 2> /dev/null | grep -q "_mcount" && \ exit 1 -echo "OK" exit 0 -- 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
