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-rw-r--r--Makefile149
1 files changed, 105 insertions, 44 deletions
diff --git a/Makefile b/Makefile
index 81171f9cfadd..6889e681f893 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
VERSION = 4
PATCHLEVEL = 4
-SUBLEVEL = 205
+SUBLEVEL = 302
EXTRAVERSION =
NAME = Blurry Fish Butt
@@ -301,8 +301,14 @@ CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
else if [ -x /bin/bash ]; then echo /bin/bash; \
else echo sh; fi ; fi)
+ifneq ($(LLVM),)
+HOSTCC = clang
+HOSTCXX = clang++
+else
HOSTCC = gcc
HOSTCXX = g++
+endif
+
HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
HOSTCXXFLAGS = -O2
@@ -313,12 +319,8 @@ KBUILD_MODULES :=
KBUILD_BUILTIN := 1
# If we have only "make modules", don't compile built-in objects.
-# When we're building modules with modversions, we need to consider
-# the built-in objects during the descend as well, in order to
-# make sure the checksums are up to date before we record them.
-
ifeq ($(MAKECMDGOALS),modules)
- KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
+ KBUILD_BUILTIN :=
endif
# If we have "make <whatever> modules", compile modules
@@ -341,27 +343,35 @@ scripts/Kbuild.include: ;
include scripts/Kbuild.include
# Make variables (CC, etc...)
+CPP = $(CC) -E
+ifneq ($(LLVM),)
+CC = clang
+LD = ld.lld
+AR = llvm-ar
+NM = llvm-nm
+OBJCOPY = llvm-objcopy
+OBJDUMP = llvm-objdump
+READELF = llvm-readelf
+OBJSIZE = llvm-size
+STRIP = llvm-strip
+else
AS = $(CROSS_COMPILE)as
LD = $(CROSS_COMPILE)ld
-REAL_CC = $(CROSS_COMPILE)gcc
-CPP = $(CC) -E
+CC = $(CROSS_COMPILE)gcc
AR = $(CROSS_COMPILE)ar
NM = $(CROSS_COMPILE)nm
STRIP = $(CROSS_COMPILE)strip
OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdump
+endif
AWK = awk
GENKSYMS = scripts/genksyms/genksyms
INSTALLKERNEL := installkernel
-DEPMOD = /sbin/depmod
+DEPMOD = depmod
PERL = perl
PYTHON = python
CHECK = sparse
-# Use the wrapper for the compiler. This wrapper scans for new
-# warnings and causes the build to stop upon encountering them.
-CC = $(PYTHON) $(srctree)/scripts/gcc-wrapper.py $(REAL_CC)
-
CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
-Wbitwise -Wno-return-void $(CF)
CFLAGS_MODULE =
@@ -408,6 +418,7 @@ KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
KBUILD_AFLAGS_MODULE := -DMODULE
KBUILD_CFLAGS_MODULE := -DMODULE
KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
+LDFLAGS :=
CLANG_FLAGS :=
# Read KERNELRELEASE from include/config/kernel.release (if it exists)
@@ -624,13 +635,15 @@ ifeq ($(shell $(srctree)/scripts/clang-android.sh $(CC) $(CLANG_FLAGS)), y)
$(error "Clang with Android --target detected. Did you specify CLANG_TRIPLE?")
endif
GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
-CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
+CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
endif
ifneq ($(GCC_TOOLCHAIN),)
CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
endif
+ifneq ($(LLVM_IAS),1)
CLANG_FLAGS += -no-integrated-as
+endif
CLANG_FLAGS += -Werror=unknown-warning-option
CLANG_FLAGS += $(call cc-option, -Wno-misleading-indentation)
CLANG_FLAGS += $(call cc-option, -Wno-bool-operation)
@@ -646,7 +659,6 @@ ARCH_CFLAGS :=
include arch/$(SRCARCH)/Makefile
KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
-KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
@@ -654,6 +666,11 @@ KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
KBUILD_CFLAGS += $(call cc-disable-warning, attribute-alias)
+ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
+KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
+KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
+endif
+
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
KBUILD_CFLAGS += -Os
else
@@ -664,8 +681,13 @@ KBUILD_CFLAGS += -O2
endif
endif
+ifdef CONFIG_CC_WERROR
+KBUILD_CFLAGS += -Werror
+endif
+
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
+KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
# check for 'asm goto'
ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
@@ -737,8 +759,8 @@ KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
-KBUILD_CFLAGS += -Wno-undefined-optimized
-KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare
+KBUILD_CFLAGS += $(call cc-option, -Wno-undefined-optimized)
+KBUILD_CFLAGS += $(call cc-option, -Wno-tautological-constant-out-of-range-compare)
# Quiet clang warning: comparison of unsigned expression < 0 is always false
KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
@@ -747,12 +769,11 @@ KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
# See modpost pattern 2
KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
-else
+endif
# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
-endif
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
ifdef CONFIG_FRAME_POINTER
@@ -776,8 +797,11 @@ KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
else
KBUILD_CFLAGS += -g
endif
+ifneq ($(LLVM_IAS),1)
KBUILD_AFLAGS += -Wa,-gdwarf-2
endif
+endif
+
ifdef CONFIG_DEBUG_INFO_DWARF4
KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
endif
@@ -791,6 +815,13 @@ ifdef CONFIG_FUNCTION_TRACER
ifndef CC_FLAGS_FTRACE
CC_FLAGS_FTRACE := -pg
endif
+ifdef CONFIG_FTRACE_MCOUNT_RECORD
+ # gcc 5 supports generating the mcount tables directly
+ ifeq ($(call cc-option-yn,-mrecord-mcount),y)
+ CC_FLAGS_FTRACE += -mrecord-mcount
+ export CC_USING_RECORD_MCOUNT := 1
+ endif
+endif
export CC_FLAGS_FTRACE
ifdef CONFIG_HAVE_FENTRY
CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
@@ -823,6 +854,17 @@ KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
+# We'll want to enable this eventually, but it's not going away for 5.7 at least
+KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
+KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
+KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
+
+# Another good warning that we'll want to enable eventually
+KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
+
+# Enabled with W=2, disabled by default as noisy
+KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
+
# disable invalid "can't wrap" optimizations for signed / pointers
KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
@@ -850,12 +892,6 @@ KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
-# ensure -fcf-protection is disabled when using retpoline as it is
-# incompatible with -mindirect-branch=thunk-extern
-ifdef CONFIG_RETPOLINE
-KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
-endif
-
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)
@@ -875,6 +911,10 @@ LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
+ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
+LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
+endif
+
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
LDFLAGS_vmlinux += $(call ld-option, -X,)
endif
@@ -977,22 +1017,27 @@ core-y := $(patsubst %/, %/built-in.o, $(core-y))
drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
net-y := $(patsubst %/, %/built-in.o, $(net-y))
libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
-libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
-libs-y := $(libs-y1) $(libs-y2)
+libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
# Externally visible symbols (used by link-vmlinux.sh)
export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
-export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
+export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
+export KBUILD_VMLINUX_LIBS := $(libs-y1)
export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
export LDFLAGS_vmlinux
# used by scripts/pacmage/Makefile
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
-vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
+vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
+
+ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
# Final link of vmlinux
- cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
+ cmd_link-vmlinux = \
+ $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux); \
+ $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
+
quiet_cmd_link-vmlinux = LINK $@
# Include targets which we want to
@@ -1010,8 +1055,16 @@ endif
ifdef CONFIG_GDB_SCRIPTS
$(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
endif
+ifdef CONFIG_TRIM_UNUSED_KSYMS
+ $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
+ "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq"
+endif
+$(call if_changed,link-vmlinux)
+# standalone target for easier testing
+include/generated/autoksyms.h: FORCE
+ $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
+
# The actual objects are generated when descending,
# make sure no implicit rule kicks in
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
@@ -1079,17 +1132,22 @@ prepare: prepare0
# needs to be updated, so this check is forced on all builds
uts_len := 64
+ifneq (,$(BUILD_NUMBER))
+ UTS_RELEASE=$(KERNELRELEASE)-ab$(BUILD_NUMBER)
+else
+ UTS_RELEASE=$(KERNELRELEASE)
+endif
define filechk_utsrelease.h
- if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
- echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
- exit 1; \
- fi; \
- (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
+ if [ `echo -n "$(UTS_RELEASE)" | wc -c ` -gt $(uts_len) ]; then \
+ echo '"$(UTS_RELEASE)" exceeds $(uts_len) characters' >&2; \
+ exit 1; \
+ fi; \
+ (echo \#define UTS_RELEASE \"$(UTS_RELEASE)\";)
endef
define filechk_version.h
(echo \#define LINUX_VERSION_CODE $(shell \
- expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
+ expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 255); \
echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
endef
@@ -1173,6 +1231,13 @@ ifdef CONFIG_MODULES
all: modules
+# When we're building modules with modversions, we need to consider
+# the built-in objects during the descend as well, in order to
+# make sure the checksums are up to date before we record them.
+ifdef CONFIG_MODVERSIONS
+ KBUILD_BUILTIN := 1
+endif
+
# Build modules
#
# A module can be listed more than once in obj-m resulting in
@@ -1275,6 +1340,7 @@ $(clean-dirs):
vmlinuxclean:
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
+ $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
clean: archclean vmlinuxclean
@@ -1452,9 +1518,6 @@ else # KBUILD_EXTMOD
# We are always building modules
KBUILD_MODULES := 1
-PHONY += crmodverdir
-crmodverdir:
- $(cmd_crmodverdir)
PHONY += $(objtree)/Module.symvers
$(objtree)/Module.symvers:
@@ -1466,7 +1529,7 @@ $(objtree)/Module.symvers:
module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
PHONY += $(module-dirs) modules
-$(module-dirs): crmodverdir $(objtree)/Module.symvers
+$(module-dirs): prepare $(objtree)/Module.symvers
$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
modules: $(module-dirs)
@@ -1506,7 +1569,8 @@ help:
# Dummies...
PHONY += prepare scripts
-prepare: ;
+prepare:
+ $(cmd_crmodverdir)
scripts: ;
endif # KBUILD_EXTMOD
@@ -1630,17 +1694,14 @@ endif
# Modules
/: prepare scripts FORCE
- $(cmd_crmodverdir)
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
$(build)=$(build-dir)
# Make sure the latest headers are built for Documentation
Documentation/: headers_install
%/: prepare scripts FORCE
- $(cmd_crmodverdir)
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
$(build)=$(build-dir)
%.ko: prepare scripts FORCE
- $(cmd_crmodverdir)
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
$(build)=$(build-dir) $(@:.ko=.o)
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-22 13:31:43 +0000