Date:	Fri, 8 Nov 2013 12:20:13 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Russell King <linux@....linux.org.uk>,
	Michal Marek <mmarek@...e.cz>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: kernel BUG at kernel/kallsyms.c:222!

>>> Hi Ming,
>>>
>>> I found in arch/arm/include/asm/memory.h:
>>> CONFIG_PAGE_OFFSET is not used if !CONFIG_MMU.
>>> So looks like setting CONFIG_PAGE_OFFSET to other value still won't work.
>>
>> This seems like the simplest solution, but it may mean you still have
>> crap in /proc/kallsyms.
>>
>> Does it work for you?
>
> Yes, it should work, but I am wondering if perf can work on uClinux.
>
> Axel, could you post your .config?


Hi Ming,

I have patches on top of 3.12 to support gpl32700 SoC.
So you cannot find this platform on mainline kernel.
I havn't tried perf, below is my config for your reference:
(to make the config smaller, I grep out disabled config entries.)

#
# Automatically generated file; DO NOT EDIT.
# Linux/arm 3.12.0 Kernel Configuration
#
CONFIG_ARM=y
CONFIG_SYS_SUPPORTS_APM_EMULATION=y
CONFIG_STACKTRACE_SUPPORT=y
CONFIG_HAVE_LATENCYTOP_SUPPORT=y
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_TRACE_IRQFLAGS_SUPPORT=y
CONFIG_RWSEM_GENERIC_SPINLOCK=y
CONFIG_GENERIC_HWEIGHT=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_NEED_DMA_MAP_STATE=y
CONFIG_VECTORS_BASE=0x00000000
CONFIG_PHYS_OFFSET=0x00000000
CONFIG_GENERIC_BUG=y
CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
CONFIG_IRQ_WORK=y

#
# General setup
#
CONFIG_BROKEN_ON_SMP=y
CONFIG_INIT_ENV_ARG_LIMIT=32
CONFIG_CROSS_COMPILE=""
CONFIG_LOCALVERSION=""
CONFIG_LOCALVERSION_AUTO=y
CONFIG_HAVE_KERNEL_GZIP=y
CONFIG_HAVE_KERNEL_LZMA=y
CONFIG_HAVE_KERNEL_XZ=y
CONFIG_HAVE_KERNEL_LZO=y
CONFIG_HAVE_KERNEL_LZ4=y
CONFIG_KERNEL_GZIP=y
CONFIG_DEFAULT_HOSTNAME="(none)"

#
# IRQ subsystem
#
CONFIG_GENERIC_IRQ_PROBE=y
CONFIG_GENERIC_IRQ_SHOW=y
CONFIG_HARDIRQS_SW_RESEND=y
CONFIG_GENERIC_IRQ_CHIP=y
CONFIG_IRQ_DOMAIN=y
CONFIG_IRQ_FORCED_THREADING=y
CONFIG_KTIME_SCALAR=y
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_GENERIC_CLOCKEVENTS_BUILD=y

#
# Timers subsystem
#
CONFIG_HZ_PERIODIC=y

#
# CPU/Task time and stats accounting
#
CONFIG_TICK_CPU_ACCOUNTING=y

#
# RCU Subsystem
#
CONFIG_TINY_RCU=y
CONFIG_LOG_BUF_SHIFT=14
CONFIG_GENERIC_SCHED_CLOCK=y
CONFIG_BLK_DEV_INITRD=y
CONFIG_INITRAMFS_SOURCE=""
CONFIG_RD_GZIP=y
CONFIG_SYSCTL=y
CONFIG_ANON_INODES=y
CONFIG_HAVE_UID16=y
CONFIG_EXPERT=y
CONFIG_UID16=y
CONFIG_KALLSYMS=y
CONFIG_KALLSYMS_ALL=y
CONFIG_PRINTK=y
CONFIG_BUG=y
CONFIG_BASE_FULL=y
CONFIG_EPOLL=y
CONFIG_SIGNALFD=y
CONFIG_EVENTFD=y
CONFIG_AIO=y
CONFIG_EMBEDDED=y
CONFIG_HAVE_PERF_EVENTS=y
CONFIG_PERF_USE_VMALLOC=y

#
# Kernel Performance Events And Counters
#
CONFIG_COMPAT_BRK=y
CONFIG_SLAB=y
CONFIG_HAVE_OPROFILE=y
CONFIG_HAVE_KPROBES=y
CONFIG_HAVE_KRETPROBES=y
CONFIG_HAVE_ARCH_TRACEHOOK=y
CONFIG_HAVE_DMA_ATTRS=y
CONFIG_GENERIC_SMP_IDLE_THREAD=y
CONFIG_GENERIC_IDLE_POLL_SETUP=y
CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
CONFIG_HAVE_CLK=y
CONFIG_HAVE_DMA_API_DEBUG=y
CONFIG_HAVE_ARCH_JUMP_LABEL=y
CONFIG_ARCH_WANT_IPC_PARSE_VERSION=y
CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
CONFIG_HAVE_CONTEXT_TRACKING=y
CONFIG_HAVE_IRQ_TIME_ACCOUNTING=y
CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
CONFIG_MODULES_USE_ELF_REL=y
CONFIG_CLONE_BACKWARDS=y
CONFIG_OLD_SIGSUSPEND3=y
CONFIG_OLD_SIGACTION=y

#
# GCOV-based kernel profiling
#
CONFIG_HAVE_GENERIC_DMA_COHERENT=y
CONFIG_SLABINFO=y
CONFIG_BASE_SMALL=0
CONFIG_BLOCK=y

#
# Partition Types
#
CONFIG_MSDOS_PARTITION=y
CONFIG_EFI_PARTITION=y

#
# IO Schedulers
#
CONFIG_IOSCHED_NOOP=y
CONFIG_DEFAULT_NOOP=y
CONFIG_DEFAULT_IOSCHED="noop"
CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
CONFIG_INLINE_READ_UNLOCK=y
CONFIG_INLINE_READ_UNLOCK_IRQ=y
CONFIG_INLINE_WRITE_UNLOCK=y
CONFIG_INLINE_WRITE_UNLOCK_IRQ=y

#
# System Type
#
CONFIG_ARCH_GPL327XX=y

#
# GPL327XX Implementations
#
CONFIG_ARCH_GPL32700=y

#
# Processor Type
#
CONFIG_CPU_ARM7TDMI=y
CONFIG_CPU_32v4T=y
CONFIG_CPU_ABRT_LV4T=y
CONFIG_CPU_PABRT_LEGACY=y
CONFIG_CPU_CACHE_V4=y

#
# Processor Features
#
CONFIG_TLS_REG_EMUL=y
CONFIG_NEED_KUSER_HELPERS=y
CONFIG_KUSER_HELPERS=y
CONFIG_ARM_L1_CACHE_SHIFT=5
CONFIG_ARM_NR_BANKS=8
CONFIG_MULTI_IRQ_HANDLER=y
CONFIG_SET_MEM_PARAM=y
CONFIG_DRAM_BASE=0x00000000
CONFIG_DRAM_SIZE=0x02000000
CONFIG_FLASH_MEM_BASE=0x20000000
CONFIG_FLASH_SIZE=0x00400000
CONFIG_PROCESSOR_ID=0x41807700

#
# Bus support
#

#
# Kernel Features
#
CONFIG_VMSPLIT_3G=y
CONFIG_PAGE_OFFSET=0xC0000000
CONFIG_ARCH_NR_GPIO=0
CONFIG_PREEMPT_NONE=y
CONFIG_HZ_FIXED=0
CONFIG_HZ_100=y
CONFIG_HZ=100
CONFIG_AEABI=y
CONFIG_HAVE_ARCH_PFN_VALID=y
CONFIG_ARCH_WANT_GENERAL_HUGETLB=y
CONFIG_FLATMEM=y
CONFIG_FLAT_NODE_MEM_MAP=y
CONFIG_HAVE_MEMBLOCK=y
CONFIG_PAGEFLAGS_EXTENDED=y
CONFIG_SPLIT_PTLOCK_CPUS=999999
CONFIG_ZONE_DMA_FLAG=0
CONFIG_NOMMU_INITIAL_TRIM_EXCESS=1
CONFIG_NEED_PER_CPU_KM=y
CONFIG_FORCE_MAX_ZONEORDER=11

#
# Boot options
#
CONFIG_USE_OF=y
CONFIG_ZBOOT_ROM_TEXT=0x0
CONFIG_ZBOOT_ROM_BSS=0x0
CONFIG_CMDLINE=""
CONFIG_AUTO_ZRELADDR=y

#
# CPU Power Management
#

#
# CPU Idle
#

#
# Floating point emulation
#

#
# At least one emulation must be selected
#

#
# Userspace binary formats
#
CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE=y
CONFIG_BINFMT_SCRIPT=y
CONFIG_BINFMT_FLAT=y
CONFIG_COREDUMP=y

#
# Power management options
#
CONFIG_NET=y

#
# Networking options
#
CONFIG_XFRM=y
CONFIG_INET=y
CONFIG_NET_IP_TUNNEL=y
CONFIG_INET_TUNNEL=y
CONFIG_TCP_CONG_CUBIC=y
CONFIG_DEFAULT_TCP_CONG="cubic"
CONFIG_IPV6=y
CONFIG_INET6_XFRM_MODE_TRANSPORT=y
CONFIG_INET6_XFRM_MODE_TUNNEL=y
CONFIG_INET6_XFRM_MODE_BEET=y
CONFIG_IPV6_SIT=y
CONFIG_IPV6_NDISC_NODETYPE=y
CONFIG_HAVE_NET_DSA=y
CONFIG_NET_RX_BUSY_POLL=y
CONFIG_BQL=y

#
# Network testing
#
CONFIG_WIRELESS=y
CONFIG_CFG80211=y
CONFIG_NL80211_TESTMODE=y
CONFIG_CFG80211_DEFAULT_PS=y
CONFIG_MAC80211=y
CONFIG_MAC80211_HAS_RC=y
CONFIG_MAC80211_RC_MINSTREL=y
CONFIG_MAC80211_RC_MINSTREL_HT=y
CONFIG_MAC80211_RC_DEFAULT_MINSTREL=y
CONFIG_MAC80211_RC_DEFAULT="minstrel_ht"
CONFIG_HAVE_BPF_JIT=y

#
# Device Drivers
#

#
# Generic Driver Options
#
CONFIG_UEVENT_HELPER_PATH=""
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_STANDALONE=y
CONFIG_PREVENT_FIRMWARE_BUILD=y
CONFIG_FW_LOADER=y
CONFIG_FIRMWARE_IN_KERNEL=y
CONFIG_EXTRA_FIRMWARE=""
CONFIG_FW_LOADER_USER_HELPER=y

#
# Bus devices
#
CONFIG_MTD=y
CONFIG_MTD_OF_PARTS=y

#
# User Modules And Translation Layers
#
CONFIG_MTD_BLKDEVS=y
CONFIG_MTD_BLOCK=y

#
# RAM/ROM/Flash chip drivers
#
CONFIG_MTD_MAP_BANK_WIDTH_1=y
CONFIG_MTD_MAP_BANK_WIDTH_2=y
CONFIG_MTD_MAP_BANK_WIDTH_4=y
CONFIG_MTD_CFI_I1=y
CONFIG_MTD_CFI_I2=y
CONFIG_MTD_RAM=y
CONFIG_MTD_ROM=y

#
# Mapping drivers for chip access
#

#
# Self-contained MTD device drivers
#
CONFIG_MTD_M25P80=y

#
# Disk-On-Chip Device Drivers
#

#
# LPDDR flash memory drivers
#
CONFIG_DTC=y
CONFIG_OF=y

#
# Device Tree and Open Firmware support
#
CONFIG_OF_FLATTREE=y
CONFIG_OF_EARLY_FLATTREE=y
CONFIG_OF_ADDRESS=y
CONFIG_OF_IRQ=y
CONFIG_OF_NET=y
CONFIG_OF_MTD=y
CONFIG_BLK_DEV=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_LOOP_MIN_COUNT=8
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_COUNT=16
CONFIG_BLK_DEV_RAM_SIZE=4096

#
# Misc devices
#

#
# EEPROM support
#

#
# Texas Instruments shared transport line discipline
#

#
# Altera FPGA firmware download module
#

#
# SCSI device support
#
CONFIG_SCSI_MOD=y
CONFIG_NETDEVICES=y
CONFIG_NET_CORE=y

#
# CAIF transport drivers
#

#
# Distributed Switch Architecture drivers
#
CONFIG_WLAN=y

#
# Enable WiMAX (Networking options) to see the WiMAX drivers
#

#
# Input device support
#
CONFIG_INPUT=y

#
# Userland interfaces
#

#
# Input Device Drivers
#
CONFIG_INPUT_KEYBOARD=y
CONFIG_KEYBOARD_ATKBD=y

#
# Hardware I/O ports
#
CONFIG_SERIO=y
CONFIG_SERIO_SERPORT=y
CONFIG_SERIO_LIBPS2=y

#
# Character devices
#
CONFIG_TTY=y
CONFIG_VT=y
CONFIG_CONSOLE_TRANSLATIONS=y
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y
CONFIG_UNIX98_PTYS=y
CONFIG_LEGACY_PTYS=y
CONFIG_LEGACY_PTY_COUNT=256

#
# Serial drivers
#

#
# Non-8250 serial port support
#
CONFIG_SERIAL_GPL327XX=y
CONFIG_SERIAL_GPL327XX_UART_CONSOLE=y
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
CONFIG_SPI=y
CONFIG_SPI_MASTER=y

#
# SPI Master Controller Drivers
#
CONFIG_SPI_GPL327XX=y

#
# SPI Protocol Masters
#

#
# PPS support
#

#
# PPS generators support
#

#
# PTP clock support
#

#
# Enable PHYLIB and NETWORK_PHY_TIMESTAMPING to see the additional clocks.
#
CONFIG_PINCTRL=y

#
# Pin controllers
#
CONFIG_PINMUX=y
CONFIG_PINCONF=y
CONFIG_GENERIC_PINCONF=y
CONFIG_PINCTRL_GPL327XX=y
CONFIG_PINCTRL_GPL32700=y
CONFIG_ARCH_HAVE_CUSTOM_GPIO_H=y
CONFIG_ARCH_REQUIRE_GPIOLIB=y
CONFIG_GPIO_DEVRES=y
CONFIG_GPIOLIB=y
CONFIG_OF_GPIO=y

#
# Memory mapped GPIO drivers:
#

#
# I2C GPIO expanders:
#

#
# PCI GPIO expanders:
#

#
# SPI GPIO expanders:
#

#
# AC97 GPIO expanders:
#

#
# LPC GPIO expanders:
#

#
# MODULbus GPIO expanders:
#

#
# USB GPIO expanders:
#
CONFIG_SSB_POSSIBLE=y

#
# Sonics Silicon Backplane
#
CONFIG_BCMA_POSSIBLE=y

#
# Broadcom specific AMBA
#

#
# Multifunction device drivers
#
CONFIG_REGULATOR=y
CONFIG_REGULATOR_FIXED_VOLTAGE=y

#
# Graphics support
#

#
# Console display driver support
#
CONFIG_DUMMY_CONSOLE=y

#
# HID support
#
CONFIG_HID=y
CONFIG_HID_GENERIC=y

#
# Special HID drivers
#
CONFIG_USB_OHCI_LITTLE_ENDIAN=y
CONFIG_MMC=y
CONFIG_MMC_DEBUG=y

#
# MMC/SD/SDIO Card Drivers
#
CONFIG_MMC_BLOCK=y
CONFIG_MMC_BLOCK_MINORS=8
CONFIG_MMC_BLOCK_BOUNCE=y

#
# MMC/SD/SDIO Host Controller Drivers
#
CONFIG_MMC_GPL327XX=y
CONFIG_RTC_LIB=y
CONFIG_DMADEVICES=y

#
# DMA Devices
#
CONFIG_DMA_OF=y

#
# Virtio drivers
#

#
# Microsoft Hyper-V guest support
#
CONFIG_CLKDEV_LOOKUP=y
CONFIG_HAVE_CLK_PREPARE=y
CONFIG_COMMON_CLK=y

#
# Common Clock Framework
#

#
# Hardware Spinlock drivers
#
CONFIG_CLKSRC_OF=y
CONFIG_CLKSRC_MMIO=y

#
# Remoteproc drivers
#

#
# Rpmsg drivers
#
CONFIG_IRQCHIP=y

#
# File systems
#
CONFIG_EXT2_FS=y
CONFIG_FILE_LOCKING=y
CONFIG_FSNOTIFY=y
CONFIG_INOTIFY_USER=y

#
# Caches
#

#
# CD-ROM/DVD Filesystems
#

#
# DOS/FAT/NT Filesystems
#
CONFIG_FAT_FS=y
CONFIG_VFAT_FS=y
CONFIG_FAT_DEFAULT_CODEPAGE=437
CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1"

#
# Pseudo filesystems
#
CONFIG_PROC_FS=y
CONFIG_PROC_SYSCTL=y
CONFIG_SYSFS=y
CONFIG_MISC_FILESYSTEMS=y
CONFIG_JFFS2_FS=y
CONFIG_JFFS2_FS_DEBUG=2
CONFIG_JFFS2_FS_WRITEBUFFER=y
CONFIG_JFFS2_SUMMARY=y
CONFIG_JFFS2_ZLIB=y
CONFIG_JFFS2_RTIME=y
CONFIG_ROMFS_FS=y
CONFIG_ROMFS_BACKED_BY_BLOCK=y
CONFIG_ROMFS_ON_BLOCK=y
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="iso8859-1"
CONFIG_NLS_CODEPAGE_437=y
CONFIG_NLS_ISO8859_1=y

#
# Kernel hacking
#

#
# printk and dmesg options
#
CONFIG_PRINTK_TIME=y
CONFIG_DEFAULT_MESSAGE_LOGLEVEL=4

#
# Compile-time checks and compiler options
#
CONFIG_DEBUG_INFO=y
CONFIG_ENABLE_WARN_DEPRECATED=y
CONFIG_FRAME_WARN=1024
CONFIG_DEBUG_KERNEL=y

#
# Memory Debugging
#
CONFIG_HAVE_DEBUG_KMEMLEAK=y

#
# Debug Lockups and Hangs
#
CONFIG_LOCKUP_DETECTOR=y
CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE=0
CONFIG_DETECT_HUNG_TASK=y
CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120
CONFIG_BOOTPARAM_HUNG_TASK_PANIC=y
CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE=1
CONFIG_PANIC_ON_OOPS=y
CONFIG_PANIC_ON_OOPS_VALUE=1

#
# Lock Debugging (spinlocks, mutexes, etc...)
#
CONFIG_DEBUG_BUGVERBOSE=y

#
# RCU Debugging
#
CONFIG_HAVE_FUNCTION_TRACER=y
CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
CONFIG_HAVE_DYNAMIC_FTRACE=y
CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
CONFIG_HAVE_C_RECORDMCOUNT=y
CONFIG_TRACING_SUPPORT=y

#
# Runtime Testing
#
CONFIG_HAVE_ARCH_KGDB=y
CONFIG_ARM_UNWIND=y
CONFIG_DEBUG_USER=y
CONFIG_DEBUG_LL=y
CONFIG_DEBUG_GPL327XX_UART=y
CONFIG_DEBUG_LL_INCLUDE="debug/gpl327xx.S"
CONFIG_UNCOMPRESS_INCLUDE="mach/uncompress.h"
CONFIG_EARLY_PRINTK=y

#
# Security options
#
CONFIG_DEFAULT_SECURITY_DAC=y
CONFIG_DEFAULT_SECURITY=""
CONFIG_CRYPTO=y

#
# Crypto core or helper
#
CONFIG_CRYPTO_ALGAPI=y
CONFIG_CRYPTO_ALGAPI2=y
CONFIG_CRYPTO_AEAD2=y
CONFIG_CRYPTO_BLKCIPHER=y
CONFIG_CRYPTO_BLKCIPHER2=y
CONFIG_CRYPTO_HASH=y
CONFIG_CRYPTO_HASH2=y
CONFIG_CRYPTO_RNG=y
CONFIG_CRYPTO_RNG2=y
CONFIG_CRYPTO_PCOMP2=y
CONFIG_CRYPTO_MANAGER=y
CONFIG_CRYPTO_MANAGER2=y
CONFIG_CRYPTO_MANAGER_DISABLE_TESTS=y
CONFIG_CRYPTO_WORKQUEUE=y

#
# Authenticated Encryption with Associated Data
#

#
# Block modes
#
CONFIG_CRYPTO_CBC=y

#
# Hash modes
#

#
# Digest
#
CONFIG_CRYPTO_MD5=y
CONFIG_CRYPTO_SHA1=y

#
# Ciphers
#
CONFIG_CRYPTO_AES=y
CONFIG_CRYPTO_ARC4=y
CONFIG_CRYPTO_DES=y

#
# Compression
#
CONFIG_CRYPTO_DEFLATE=y

#
# Random Number Generation
#
CONFIG_CRYPTO_ANSI_CPRNG=y
CONFIG_CRYPTO_HW=y

#
# Library routines
#
CONFIG_BITREVERSE=y
CONFIG_GENERIC_STRNCPY_FROM_USER=y
CONFIG_GENERIC_STRNLEN_USER=y
CONFIG_GENERIC_NET_UTILS=y
CONFIG_GENERIC_PCI_IOMAP=y
CONFIG_GENERIC_IO=y
CONFIG_CRC32=y
CONFIG_CRC32_SLICEBY8=y
CONFIG_ZLIB_INFLATE=y
CONFIG_ZLIB_DEFLATE=y
CONFIG_DECOMPRESS_GZIP=y
CONFIG_HAS_IOMEM=y
CONFIG_HAS_IOPORT=y
CONFIG_HAS_DMA=y
CONFIG_DQL=y
CONFIG_NLATTR=y
CONFIG_GENERIC_ATOMIC64=y
CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE=y
CONFIG_AVERAGE=y
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