move some tools/lkl/Makefile.autoconf logic to kconfig

arch/lkl/Kconfig

@@ -1,111 +1,112 @@
 config LKL
-       def_bool y
-       depends on !SMP && !COREDUMP && !SECCOMP && !UPROBES && !COMPAT && !USER_RETURN_NOTIFIER
-       select ARCH_THREAD_STACK_ALLOCATOR
-       select GENERIC_ATOMIC64
-       select GENERIC_HWEIGHT
-       select FLATMEM
-       select GENERIC_CLOCKEVENTS
-       select GENERIC_CPU_DEVICES
-       select NO_HZ_IDLE
-       select NO_PREEMPT
-       select ARCH_WANT_FRAME_POINTERS
-       select UACCESS_MEMCPY
-       select GENERIC_STRNCPY_FROM_USER
-       select GENERIC_STRNLEN_USER
-       select HAVE_ARCH_KASAN
-       select TRACING
+	def_bool y
+	depends on !SMP && !COREDUMP && !SECCOMP && !UPROBES && !COMPAT && !USER_RETURN_NOTIFIER
+	select ARCH_THREAD_STACK_ALLOCATOR
+	select GENERIC_ATOMIC64
+	select GENERIC_HWEIGHT
+	select FLATMEM
+	select GENERIC_CLOCKEVENTS
+	select GENERIC_CPU_DEVICES
+	select NO_HZ_IDLE
+	select NO_PREEMPT
+	select ARCH_WANT_FRAME_POINTERS
+	select UACCESS_MEMCPY
+	select GENERIC_STRNCPY_FROM_USER
+	select GENERIC_STRNLEN_USER
+	select HAVE_ARCH_KASAN
+	select TRACING
 
 config LKL_FUZZING
-       bool "LLVM fuzzing instrumentation"
-       default n
-       help
-         This configuration option enables fuzzing instrumentation
-         for the Linux kernel source files to enable coverage-guided
-         fuzzing. At the moment LKL supports libFuzzer fuzzing
-         engine only.
+	bool "LLVM fuzzing instrumentation"
+	default n
+	help
+	  This configuration option enables fuzzing instrumentation
+	  for the Linux kernel source files to enable coverage-guided
+	  fuzzing. At the moment LKL supports libFuzzer fuzzing
+	  engine only.
 
 config LKL_LINE_COV
-       bool "Code coverage instrumentation for fuzzers"
-       depends on LKL_FUZZING && CC_IS_CLANG
-       default n
-       help
-         This configuration option enables line code coverage
-         instrumentation for the Linux kernel to generate fuzzing
-         code coverage reports. When this option is enabled the
-         kernel source files are built with LLVM SanitizerCoverage
-         instrumentation.
+	bool "Code coverage instrumentation for fuzzers"
+	depends on LKL_FUZZING && CC_IS_CLANG
+	default n
+	help
+	  This configuration option enables line code coverage
+	  instrumentation for the Linux kernel to generate fuzzing
+	  code coverage reports. When this option is enabled the
+	  kernel source files are built with LLVM SanitizerCoverage
+	  instrumentation.
 
 config OUTPUT_FORMAT
-       string "Output format"
-       default ""
+	string "Output format"
+	default $(shell,$(srctree)/arch/lkl/scripts/cc-objdump-file-format.sh)
 
 config ARCH_DMA_ADDR_T_64BIT
-       def_bool 64BIT
+	def_bool 64BIT
 
 config PHYS_ADDR_T_64BIT
-       def_bool 64BIT
+	def_bool 64BIT
 
 config 64BIT
-       bool "64bit kernel"
-       default n
+	bool "64bit kernel"
+	default y if OUTPUT_FORMAT = "pe-x86-64"
+	default $(success,$(srctree)/arch/lkl/scripts/cc-objdump-file-format.sh|grep -q '^elf64-') if OUTPUT_FORMAT != "pe-x86-64"
 
 config MMU
-       bool "LKL MMU implementation"
-       depends on 64BIT
-       default n
+	bool "LKL MMU implementation"
+	depends on 64BIT
+	default n
 
 if MMU
 config PGTABLE_LEVELS
-       int
-       default 3
+	int
+	default 3
 
 config LKL_MEMORY_START
-       hex
-       default 0x50000000
-       help
-         Base address of kernel virtual address space for LKL. No particular
-         reason for picking this specific value. It is assumed that the host
-         mmap is able to map requested amount of memory at this address.
-         STACK_TOP and VMALLOC_START values depend on it.
-
+	hex
+	default 0x50000000
+	help
+	  Base address of kernel virtual address space for LKL. No particular
+	  reason for picking this specific value. It is assumed that the host
+	  mmap is able to map requested amount of memory at this address.
+	  STACK_TOP and VMALLOC_START values depend on it.
 
 config LKL_TASK_UNMAPPED_BASE
-       hex
-       default 0x100000
-       help
-         Starting virtual address for LKL user-space mmap. It is assumed that
-         the host mmap is able to map requested amount of memory starting from
-         this address.
+	hex
+	default 0x100000
+	help
+	  Starting virtual address for LKL user-space mmap. It is assumed that
+	  the host mmap is able to map requested amount of memory starting from
+	  this address.
 
 config LKL_MMU_KUNIT_TEST
-       bool "Kunit tests for LKL MMU"
-       default n
-       depends on KUNIT
-       help
-         Kunit tests to test correctness of MMU-related kernel interfaces (such
-         as vmalloc, for example) which are difficult to test in user-space.
+	bool "Kunit tests for LKL MMU"
+	default n
+	depends on KUNIT
+	help
+	  Kunit tests to test correctness of MMU-related kernel interfaces (such
+	  as vmalloc, for example) which are difficult to test in user-space.
 endif
 
 config COREDUMP
-       def_bool n
+	def_bool n
 
 config CPU_BIG_ENDIAN
-       bool "Big-endian kernel"
-       default n
+	bool "Big-endian kernel"
+	default y if OUTPUT_FORMAT = "elf64-s390"
+	default n if OUTPUT_FORMAT != "elf64-s390"
 
 config GENERIC_CSUM
-       def_bool y
+	def_bool y
 
 config GENERIC_HWEIGHT
-       def_bool y
+	def_bool y
 
 config NO_IOPORT_MAP
-       def_bool y
+	def_bool y
 
 config HZ
-        int
-        default 100
+	int
+	default 100
 
 config CONSOLE_LOGLEVEL_QUIET
 	int "quiet console loglevel (1-15)"
@@ -131,16 +132,18 @@ config RAID6_PQ_BENCHMARK
 	default n
 
 config STACKTRACE_SUPPORT
-       def_bool y
+	def_bool y
 
 if KASAN
 config KASAN_SHADOW_OFFSET
-       hex "KASAN shadow offset"
-       default "0"
+	hex "KASAN shadow offset"
+	default "0x0000200000000000" if OUTPUT_FORMAT = "elf64-x86-64"
+	default "0" if OUTPUT_FORMAT != "elf64-x86-64"
 
 config KASAN_SHADOW_SIZE
-       hex "KASAN shadow size"
-       default "0"
+	hex "KASAN shadow size"
+	default "0x0000100000000000" if OUTPUT_FORMAT = "elf64-x86-64"
+	default "0" if OUTPUT_FORMAT != "elf64-x86-64"
 endif
 
 config BUILTIN_CMDLINE
@@ -154,21 +157,22 @@ config BUILTIN_CMDLINE
 
 config LKL_HOST_MEMCPY
 	bool "Host provides memcpy"
-	default n
+	default $(success,$(srctree)/arch/lkl/scripts/cc-objdump-file-format.sh|grep -q '^elf64-') if 64BIT
+	default $(success,$(srctree)/arch/lkl/scripts/cc-objdump-file-format.sh|grep -q '^elf32-') if !64BIT
 	help
-	  This options should be set (in tools/lkl/Makefile.autoconf)
-	  if the host provides a memcpy implementation.
+	  Set to "y" if LKL should call the host memcpy hook instead of
+	  performing memory copies manually.
 
 config LKL_HOST_MEMSET
 	bool "Host provides memset"
-	default n
+	default LKL_HOST_MEMCPY
 	help
-	  This options should be set (in tools/lkl/Makefile.autoconf)
-	  if the host provides a memset implementation.
+	  Set to "y" if LKL should call the host memset hook instead of
+	  performing memory sets manually.
 
 config LKL_HOST_MEMMOVE
 	bool "Host provides memmove"
-	default n
+	default LKL_HOST_MEMCPY
 	help
-	  This options should be set (in tools/lkl/Makefile.autoconf)
-	  if the host provides a memmove implementation.
+	  Set to "y" if LKL should call the host memmove hook instead of
+	  performing memory moves manually.

arch/lkl/configs/fuzzing_defconfig

@@ -1,3 +1,4 @@
+CONFIG_LKL_FUZZING=y
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_NO_HZ_IDLE=y
 CONFIG_HIGH_RES_TIMERS=y

arch/lkl/scripts/cc-objdump-file-format.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Print the C compiler output file format, as determined by objdump.
+t=`mktemp` || exit 1
+echo 'void foo(void) {}' | $CC -x c - -c -o "$t" \
+	&& $OBJDUMP -p "$t" | awk '/file format/ {print $4}'
+rm "$t"

include/linux/shmem_fs.h

@@ -110,8 +110,17 @@ extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
 extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
 int shmem_unuse(unsigned int type);
 
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 extern bool shmem_is_huge(struct inode *inode, pgoff_t index, bool shmem_huge_force,
 			  struct mm_struct *mm, unsigned long vm_flags);
+#else
+static __always_inline bool shmem_is_huge(struct inode *inode, pgoff_t index, bool shmem_huge_force,
+					  struct mm_struct *mm, unsigned long vm_flags)
+{
+	return false;
+}
+#endif
+
 #ifdef CONFIG_SHMEM
 extern unsigned long shmem_swap_usage(struct vm_area_struct *vma);
 #else

mm/shmem.c

@@ -742,12 +742,6 @@ static long shmem_unused_huge_count(struct super_block *sb,
 
 #define shmem_huge SHMEM_HUGE_DENY
 
-bool shmem_is_huge(struct inode *inode, pgoff_t index, bool shmem_huge_force,
-		   struct mm_struct *mm, unsigned long vm_flags)
-{
-	return false;
-}
-
 static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
 		struct shrink_control *sc, unsigned long nr_to_split)
 {

tools/lkl/Makefile.autoconf

@@ -84,9 +84,6 @@ define posix_host
   $(if $(filter $(1),elf32-i386),$(call set_autoconf_var,I386,y))
   $(if $(strip $(call find_include,jsmn.h)),$(call set_autoconf_var,JSMN,y))
   $(if $(filter %,$(zpoline)),$(call zpoline_conf,$(zpoline)))
-  $(call set_kernel_config,LKL_HOST_MEMCPY,y)
-  $(call set_kernel_config,LKL_HOST_MEMSET,y)
-  $(call set_kernel_config,LKL_HOST_MEMMOVE,y)
 endef
 
 define nt64_host
@@ -113,21 +110,6 @@ define nt_host
   $(if $(filter $(1),pe-x86-64),$(call nt64_host))
 endef
 
-define s390_host
-  $(call set_kernel_config,CPU_BIG_ENDIAN,y)
-endef
-
-define 64bit_host
-  $(call set_kernel_config,64BIT,y)
-endef
-
-define kasan_x86_64
-  $(call set_autoconf_var,KASAN_SHADOW_OFFSET,0x0000200000000000)
-  $(call set_kernel_config,KASAN_SHADOW_OFFSET,0x0000200000000000)
-  $(call set_autoconf_var,KASAN_SHADOW_SIZE,0x0000100000000000)
-  $(call set_kernel_config,KASAN_SHADOW_SIZE,0x0000100000000000)
-endef
-
 define kasan_test_enable
   $(call set_autoconf_var,KASAN_TEST,y)
   $(call set_kernel_config,KUNIT,y)
@@ -138,10 +120,6 @@ endef
 define kasan_enable
   $(call set_autoconf_var,KASAN,y)
   $(call set_kernel_config,KASAN,y)
-  # default is 20 which should be 1MB but observed 8MB of reserved
-  # memory - half of what we use
-  $(call set_kernel_config,STACK_HASH_ORDER,12)
-  $(if $(filter $(1),elf64-x86-64),$(call kasan_x86_64))
   $(if $(filter yes,$(kasan_test)), $(call kasan_test_enable))
 endef
 
@@ -255,7 +233,6 @@ define do_autoconf_fuzzing
   $(eval LLVM := 1)
   $(eval CROSS_COMPILE := x86_64-linux-gnu)
   $(eval kasan := yes)
-  $(call set_kernel_config,LKL_FUZZING,y)
   $(if $(LKL_LINE_COV),$(call set_kernel_config,LKL_LINE_COV,y))
   $(if $(MMU),$(call set_kernel_config,ANDROID_BINDER_IPC,y))
   $(if $(PROTOBUF_MUTATOR_DIR),$(call define_libprotobuf_mutator))
@@ -271,25 +248,13 @@ endef
 define do_autoconf_mmu
   $(call set_autoconf_var,MMU,y)
   $(call set_kernel_config,MMU,y)
-  # Explicitly set LKL MMU configuration parameters for Kconfig
-  $(call set_autoconf_var,LKL_MEMORY_START,0x50000000)
-  $(call set_kernel_config,LKL_MEMORY_START,0x50000000)
-  $(call set_autoconf_var,LKL_TASK_UNMAPPED_BASE,0x100000)
-  $(call set_kernel_config,LKL_TASK_UNMAPPED_BASE,0x100000)
-  # Don't need swap in LKL. CONFIG_SHMEM generates a compile-time assertion
-  # when build with gcc, however, works fine with clang. The issues is in macro
-  # HPAGE_PMD_SIZE which should be optimized out but is not in case of gcc.
-  $(call set_kernel_config,SHMEM,n)
   $(if $(MMU_KUNIT), $(call mmu_test_enable))
 endef
 
 define do_autoconf
   $(if $(LKL_FUZZING),$(call do_autoconf_fuzzing))
   $(if $(LLVM),$(call do_autoconf_llvm),$(call do_autoconf_gnu))
   $(eval EXEC_FMT := $(shell echo $(LD_FMT) | cut -d "-" -f1))
-  $(call set_kernel_config,OUTPUT_FORMAT,\"$(LD_FMT)\")
-  $(if $(or $(filter $(EXEC_FMT),elf64),$(filter $(LD_FMT),pe-x86-64)),$(call 64bit_host))
-  $(if $(filter $(LD_FMT),elf64-s390),$(call s390_host))
   $(if $(filter $(EXEC_FMT),$(POSIX_HOSTS)),$(call posix_host,$(LD_FMT)))
   $(if $(filter $(EXEC_FMT),$(NT_HOSTS)),$(call nt_host,$(LD_FMT)))
   $(if $(and $(filter yes,$(kasan)),$(filter $(LD_FMT),$(KASAN_HOSTS))),$(call kasan_enable,$(LD_FMT)))