diff options
| -rw-r--r-- | Makefile | 13 | ||||
| -rw-r--r-- | arch/x86/Kconfig | 11 | ||||
| -rw-r--r-- | arch/x86/Makefile | 7 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/Makefile | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/cpufeature.h | 8 | ||||
| -rw-r--r-- | arch/x86/kernel/vmlinux.lds.S | 7 |
6 files changed, 16 insertions, 32 deletions
@@ -496,6 +496,13 @@ RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG))) export RETPOLINE_CFLAGS +# check for 'asm goto' +ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) + CC_HAVE_ASM_GOTO := 1 + KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO + KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO +endif + ifeq ($(config-targets),1) # =========================================================================== # *config targets only - make sure prerequisites are updated, and descend @@ -660,12 +667,6 @@ KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \ # Tell gcc to never replace conditional load with a non-conditional one KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) -# check for 'asm goto' -ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y) - KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO - KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO -endif - include scripts/Makefile.kcov include scripts/Makefile.gcc-plugins diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 0fa71a78ec99..cb5b5907dbd6 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -393,17 +393,6 @@ config X86_FEATURE_NAMES If in doubt, say Y. -config X86_FAST_FEATURE_TESTS - bool "Fast CPU feature tests" if EMBEDDED - default y - ---help--- - Some fast-paths in the kernel depend on the capabilities of the CPU. - Say Y here for the kernel to patch in the appropriate code at runtime - based on the capabilities of the CPU. The infrastructure for patching - code at runtime takes up some additional space; space-constrained - embedded systems may wish to say N here to produce smaller, slightly - slower code. - config X86_X2APIC bool "Support x2apic" depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST) diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 1c4d012550ec..60135cbd905c 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -31,8 +31,7 @@ endif CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h M16_CFLAGS := $(call cc-option, -m16, $(CODE16GCC_CFLAGS)) -REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -D__KERNEL__ \ - -DDISABLE_BRANCH_PROFILING \ +REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -DDISABLE_BRANCH_PROFILING \ -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \ -fno-strict-aliasing -fomit-frame-pointer -fno-pic \ -mno-mmx -mno-sse @@ -181,6 +180,10 @@ ifdef CONFIG_FUNCTION_GRAPH_TRACER endif endif +ifndef CC_HAVE_ASM_GOTO + $(error Compiler lacks asm-goto support.) +endif + # # Jump labels need '-maccumulate-outgoing-args' for gcc < 4.5.2 to prevent a # GCC bug (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46226). There's no way diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile index f25e1530e064..f484ae0ece93 100644 --- a/arch/x86/boot/compressed/Makefile +++ b/arch/x86/boot/compressed/Makefile @@ -26,7 +26,7 @@ KCOV_INSTRUMENT := n targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \ vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 -KBUILD_CFLAGS := -m$(BITS) -D__KERNEL__ -O2 +KBUILD_CFLAGS := -m$(BITS) -O2 KBUILD_CFLAGS += -fno-strict-aliasing $(call cc-option, -fPIE, -fPIC) KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING cflags-$(CONFIG_X86_32) := -march=i386 diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h index 736771c9822e..b27da9602a6d 100644 --- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -140,7 +140,6 @@ extern void clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int bit); #define setup_force_cpu_bug(bit) setup_force_cpu_cap(bit) -#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_X86_FAST_FEATURE_TESTS) /* * Static testing of CPU features. Used the same as boot_cpu_has(). * These will statically patch the target code for additional @@ -196,13 +195,6 @@ t_no: boot_cpu_has(bit) : \ _static_cpu_has(bit) \ ) -#else -/* - * Fall back to dynamic for gcc versions which don't support asm goto. Should be - * a minority now anyway. - */ -#define static_cpu_has(bit) boot_cpu_has(bit) -#endif #define cpu_has_bug(c, bit) cpu_has(c, (bit)) #define set_cpu_bug(c, bit) set_cpu_cap(c, (bit)) diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index b854ebf5851b..795f3a80e576 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -102,7 +102,6 @@ SECTIONS _stext = .; /* bootstrapping code */ HEAD_TEXT - . = ALIGN(8); TEXT_TEXT SCHED_TEXT CPUIDLE_TEXT @@ -200,7 +199,7 @@ SECTIONS . = __vvar_beginning_hack + PAGE_SIZE; } :data - . = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE); + . = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE); /* Init code and data - will be freed after init */ . = ALIGN(PAGE_SIZE); @@ -368,8 +367,8 @@ SECTIONS . = ALIGN(PAGE_SIZE); /* keep VO_INIT_SIZE page aligned */ _end = .; - STABS_DEBUG - DWARF_DEBUG + STABS_DEBUG + DWARF_DEBUG /* Sections to be discarded */ DISCARDS |
