ARM kirkwood: 1 Gb memory 25% unusable due to vmalloc region overlap

[Jurriaan]

I updated my Qnap TS-212 with 256 Mb memory to a new TS-221 with 1 Gb
memory.

On booting, I see that a large chunk of that new memory is not used by
linux:

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Initializing cgroup subsys cpuacct
[    0.000000] Linux version 3.14-2-kirkwood (debian-kernel@xxxxxxxxxxxxxxxx) (gcc version 4.8.3 (Debian 4.8.3-7) ) #1 Debian 3.14.15-2 (2014-08-09)
[    0.000000] CPU: Feroceon 88FR131 [56251311] revision 1 (ARMv5TE), cr=00053977
[    0.000000] CPU: VIVT data cache, VIVT instruction cache
[    0.000000] Machine: QNAP TS-119/TS-219
[    0.000000] Ignoring unrecognised tag 0x41000403
[    0.000000] Truncating RAM at 20000000-3fffffff to -2f7fffff (vmalloc region overlap).

Whoops!

[    0.000000] Memory policy: Data cache writeback
[    0.000000] On node 0 totalpages: 194560
[    0.000000] free_area_init_node: node 0, pgdat c05af874, node_mem_map ef20b000
[    0.000000]   DMA zone: 1520 pages used for memmap
[    0.000000]   DMA zone: 0 pages reserved
[    0.000000]   DMA zone: 194560 pages, LIFO batch:31
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 193040
[    0.000000] Kernel command line: console=ttyS0,115200 root=/dev/ram initrd=0xa00000,0x900000 ramdisk=34816
[    0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Memory: 755820K/778240K available (3869K kernel code, 352K rwdata, 1412K rodata, 202K init, 417K bss, 22420K reserved)
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
[    0.000000]     vmalloc : 0xf0000000 - 0xff000000   ( 240 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xef800000   ( 760 MB)
[    0.000000]     modules : 0xbf000000 - 0xc0000000   (  16 MB)
[    0.000000]       .text : 0xc0008000 - 0xc053097c   (5283 kB)
[    0.000000]       .init : 0xc0531000 - 0xc0563b34   ( 203 kB)
[    0.000000]       .data : 0xc0564000 - 0xc05bc128   ( 353 kB)
[    0.000000]        .bss : 0xc05bc128 - 0xc06246c4   ( 418 kB)
[    0.000000] NR_IRQS:114

As far as I've been able to determine, this config is used in the debian
linux-image-3.14-2-kirkwood package:

CONFIG_ARCH_KIRKWOOD=y
CONFIG_PCI=y
CONFIG_UACCESS_WITH_MEMCPY=y
CONFIG_ZBOOT_ROM_TEXT=0x0
CONFIG_ZBOOT_ROM_BSS=0x0
CONFIG_ARM_APPENDED_DTB=y
CONFIG_ARM_ATAG_DTB_COMPAT=y
CONFIG_CMDLINE=""
CONFIG_KEXEC=y
CONFIG_ATAGS_PROC=y
CONFIG_FPE_NWFPE=y
CONFIG_MACH_D2NET_V2=y
CONFIG_MACH_DOCKSTAR=y
CONFIG_MACH_ESATA_SHEEVAPLUG=y
CONFIG_MACH_GURUPLUG=y
CONFIG_MACH_INETSPACE_V2=y
CONFIG_MACH_MV88F6281GTW_GE=y
CONFIG_MACH_NET2BIG_V2=y
CONFIG_MACH_NET5BIG_V2=y
CONFIG_MACH_NETSPACE_MAX_V2=y
CONFIG_MACH_NETSPACE_V2=y
CONFIG_MACH_OPENRD_BASE=y
CONFIG_MACH_OPENRD_CLIENT=y
CONFIG_MACH_OPENRD_ULTIMATE=y
CONFIG_MACH_RD88F6192_NAS=y
CONFIG_MACH_RD88F6281=y
CONFIG_MACH_SHEEVAPLUG=y
CONFIG_MACH_T5325=y
CONFIG_MACH_TS219=y
CONFIG_MACH_TS41X=y
CONFIG_ARCH_KIRKWOOD_DT=y
CONFIG_MACH_DLINK_KIRKWOOD_DT=y
CONFIG_MACH_DOCKSTAR_DT=y
CONFIG_MACH_DREAMPLUG_DT=y
CONFIG_MACH_GOFLEXNET_DT=y
CONFIG_MACH_GURUPLUG_DT=y
CONFIG_MACH_IB62X0_DT=y
CONFIG_MACH_ICONNECT_DT=y
CONFIG_MACH_INETSPACE_V2_DT=y
CONFIG_MACH_IOMEGA_IX2_200_DT=y
CONFIG_MACH_KM_KIRKWOOD_DT=y
CONFIG_MACH_LSXL_DT=y
CONFIG_MACH_MPLCEC4_DT=y
CONFIG_MACH_NETSPACE_LITE_V2_DT=y
CONFIG_MACH_NETSPACE_MAX_V2_DT=y
CONFIG_MACH_NETSPACE_MINI_V2_DT=y
CONFIG_MACH_NETSPACE_V2_DT=y
CONFIG_MACH_OPENBLOCKS_A6_DT=y
CONFIG_MACH_TOPKICK_DT=y
CONFIG_MACH_TS219_DT=y
CONFIG_ARM_THUMB=y
CONFIG_ACORN_PARTITION=y
CONFIG_ACORN_PARTITION_ICS=y
CONFIG_ACORN_PARTITION_RISCIX=y
CONFIG_OSF_PARTITION=y
CONFIG_AMIGA_PARTITION=y
CONFIG_ATARI_PARTITION=y
CONFIG_MAC_PARTITION=y
CONFIG_BSD_DISKLABEL=y
CONFIG_MINIX_SUBPARTITION=y
CONFIG_SOLARIS_X86_PARTITION=y
CONFIG_UNIXWARE_DISKLABEL=y
CONFIG_LDM_PARTITION=y
CONFIG_SGI_PARTITION=y
CONFIG_ULTRIX_PARTITION=y
CONFIG_SUN_PARTITION=y
CONFIG_ATA=m
CONFIG_SATA_AHCI=m
CONFIG_ATA_SFF=y
CONFIG_SATA_MV=m
CONFIG_BT_HCIBCM203X=m
CONFIG_BT_HCIBPA10X=m
CONFIG_BT_HCIBFUSB=m
CONFIG_BT_HCIVHCI=m
CONFIG_CPU_IDLE=y
CONFIG_CRYPTO_DEV_MV_CESA=m
CONFIG_DMADEVICES=y
CONFIG_MV_XOR=y
CONFIG_GPIO_SYSFS=y
CONFIG_SENSORS_GPIO_FAN=m
CONFIG_I2C=y
CONFIG_I2C_CHARDEV=y
CONFIG_I2C_MV64XXX=y
CONFIG_GAMEPORT=m
CONFIG_INPUT_JOYSTICK=y
CONFIG_KEYBOARD_GPIO=m
CONFIG_INPUT_TOUCHSCREEN=y
CONFIG_ISDN=y
CONFIG_ISDN_CAPI=m
CONFIG_ISDN_DRV_AVMB1_VERBOSE_REASON=y
CONFIG_ISDN_CAPI_MIDDLEWARE=y
CONFIG_ISDN_CAPI_CAPI20=m
CONFIG_ISDN_CAPI_CAPIDRV=m
CONFIG_CAPI_AVM=y
CONFIG_ISDN_DRV_AVMB1_B1PCI=m
CONFIG_ISDN_DRV_AVMB1_B1PCIV4=y
CONFIG_ISDN_DRV_AVMB1_B1PCMCIA=m
CONFIG_ISDN_DRV_AVMB1_AVM_CS=m
CONFIG_ISDN_DRV_AVMB1_T1PCI=m
CONFIG_ISDN_DRV_AVMB1_C4=m
CONFIG_CAPI_EICON=y
CONFIG_ISDN_DIVAS=m
CONFIG_ISDN_DIVAS_BRIPCI=y
CONFIG_ISDN_DIVAS_PRIPCI=y
CONFIG_ISDN_DIVAS_DIVACAPI=m
CONFIG_ISDN_DIVAS_USERIDI=m
CONFIG_ISDN_DIVAS_MAINT=m
CONFIG_LEDS_GPIO=y
CONFIG_LEDS_NS2=m
CONFIG_LEDS_NETXBIG=m
CONFIG_LEDS_TRIGGER_TIMER=y
CONFIG_LEDS_TRIGGER_DEFAULT_ON=y
CONFIG_MMC=m
CONFIG_MMC_BLOCK=m
CONFIG_MMC_MVSDIO=m
CONFIG_MTD=y
CONFIG_MTD_CMDLINE_PARTS=y
CONFIG_MTD_OF_PARTS=y
CONFIG_MTD_BLOCK=y
CONFIG_FTL=m
CONFIG_NFTL=m
CONFIG_MTD_CFI=y
CONFIG_MTD_JEDECPROBE=y
CONFIG_MTD_CFI_ADV_OPTIONS=y
CONFIG_MTD_CFI_NOSWAP=y
CONFIG_MTD_CFI_GEOMETRY=y
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_CFI_I4=y
CONFIG_MTD_CFI_INTELEXT=y
CONFIG_MTD_CFI_AMDSTD=m
CONFIG_MTD_CFI_STAA=m
CONFIG_MTD_M25P80=y
CONFIG_MTD_PHYSMAP_OF=y
CONFIG_MTD_NAND=y
CONFIG_MTD_NAND_ORION=y
CONFIG_MTD_UBI=y
CONFIG_MV643XX_ETH=m
CONFIG_MVMDIO=m
CONFIG_MWIFIEX=m
CONFIG_MWIFIEX_SDIO=m
CONFIG_PROC_DEVICETREE=y
CONFIG_POWER_RESET_QNAP=y
CONFIG_POWER_RESET_RESTART=y
CONFIG_RTC_DRV_S35390A=y
CONFIG_RTC_DRV_MV=y
CONFIG_SPI_ORION=y
CONFIG_FB_XGI=m
CONFIG_KIRKWOOD_THERMAL=m
CONFIG_SERIAL_OF_PLATFORM=y
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_8250_NR_UARTS=4
CONFIG_SERIAL_8250_RUNTIME_UARTS=2
CONFIG_USB_SUPPORT=y
CONFIG_USB=m
CONFIG_USB_ATM=m
CONFIG_USB_SPEEDTOUCH=m
CONFIG_USB_EHCI_HCD=m
CONFIG_USB_EHCI_HCD_ORION=y
CONFIG_USB_OHCI_HCD=m
CONFIG_USB_UHCI_HCD=m
CONFIG_USB_SL811_HCD=m
CONFIG_FB=m
CONFIG_FRAMEBUFFER_CONSOLE=m
CONFIG_ORION_WATCHDOG=m
CONFIG_BINFMT_AOUT=m
CONFIG_JFFS2_FS=y
CONFIG_UBIFS_FS=y
CONFIG_CC_OPTIMIZE_FOR_SIZE=y
CONFIG_FLATMEM_MANUAL=y
CONFIG_ATM=m
CONFIG_HAMRADIO=y
CONFIG_AX25=m
CONFIG_NETROM=m
CONFIG_ROSE=m
CONFIG_SND_SOC=m
CONFIG_SND_KIRKWOOD_SOC=m
CONFIG_SND_KIRKWOOD_SOC_OPENRD=m
CONFIG_SND_KIRKWOOD_SOC_T5325=m
CONFIG_MACH_DB88F6281_BP=y

Is there something I can tweak in this config to make all memory usable
or any other way to solve this? I can test new kernels, I have a working
serial console cable installed in the TS-221.

Thanks,
Jurriaan

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/