Rebase 4.17.11 patches onto 4.17.12

Makefile

@@ -143,7 +143,8 @@ $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 
 # Invoke a second make in the output directory, passing relevant variables
 sub-make:
-	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
+	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) \
+	KBUILD_SRC=$(shell realpath --relative-to=$(KBUILD_OUTPUT) $(CURDIR)) \
 	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 
 # Leave processing to above invocation of make

arch/arm64/kernel/efi-header.S

@@ -103,6 +103,11 @@ section_table:
 
 	.set	section_count, (. - section_table) / 40
 
+	/* CoreOS 64 byte verity hash value. */
+	.org	_head + 512
+	.ascii	"verity-hash"
+	.org	_head + 512 + 64
+
 #ifdef CONFIG_DEBUG_EFI
 	/*
 	 * The debug table is referenced via its Relative Virtual Address (RVA),

arch/x86/boot/compressed/Makefile

@@ -42,16 +42,16 @@ KBUILD_AFLAGS  := $(KBUILD_CFLAGS) -D__ASSEMBLY__
 GCOV_PROFILE := n
 UBSAN_SANITIZE :=n
 
-LDFLAGS := -m elf_$(UTS_MACHINE)
+override LDFLAGS := -m elf_$(UTS_MACHINE)
 # Compressed kernel should be built as PIE since it may be loaded at any
 # address by the bootloader.
 ifeq ($(CONFIG_X86_32),y)
-LDFLAGS += $(call ld-option, -pie) $(call ld-option, --no-dynamic-linker)
+override LDFLAGS += $(call ld-option, -pie) $(call ld-option, --no-dynamic-linker)
 else
 # To build 64-bit compressed kernel as PIE, we disable relocation
 # overflow check to avoid relocation overflow error with a new linker
 # command-line option, -z noreloc-overflow.
-LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \
+override LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \
 	&& echo "-z noreloc-overflow -pie --no-dynamic-linker")
 endif
 LDFLAGS_vmlinux := -T

tools/lib/subcmd/Makefile

@@ -33,6 +33,9 @@ ifneq ($(WERROR),0)
   CFLAGS += -Werror
 endif
 
+# Don't fail on fallthrough with newer GCCs.
+CFLAGS += -Wno-error=implicit-fallthrough
+
 CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
 
 CFLAGS += -I$(srctree)/tools/include/