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    SubjectRe: kernel BUG at kernel/kallsyms.c:222!
    Date
    Axel Lin <axel.lin@ingics.com> writes:
    > 2013/11/7 Ming Lei <tom.leiming@gmail.com>:
    >> Hi,
    >>
    >> On Thu, Nov 7, 2013 at 10:47 AM, Axel Lin <axel.lin@ingics.com> wrote:
    >>>
    >>> hi Ming,
    >>> Seems CONFIG_PAGE_OFFSET is not configurabe in "make menuconfig".
    >>> And I found CONFIG_PAGE_OFFSET=0xC0000000 for all below configs...
    >>> $ make at91_dt_defconfig; grep CONFIG_PAGE_OFFSET .config
    >>> $ make ep93xx_defconfig; grep CONFIG_PAGE_OFFSET .config
    >>> $ make imx_v4_v5_defconfig; grep CONFIG_PAGE_OFFSET .config
    >>> $ make mxs_defconfig; grep CONFIG_PAGE_OFFSET .config
    >>> $ make omap2plus_defconfig; grep CONFIG_PAGE_OFFSET .config
    >>> $ make s3c6400_defconfig; grep CONFIG_PAGE_OFFSET .config
    >>> $ make at91x40_defconfig; grep CONFIG_PAGE_OFFSET .config
    >>> ( at91x40_defconfig is also arm7tdmi )
    >>
    >> Firstly it can be configured via VMSPLIT_3GVMSPLIT_2G/VMSPLIT_1G.
    >>
    >> Secondly, configurable or not isn't the point, and maybe some uclinux
    >> platforms do not use CONFIG_PAGE_OFFSET at all, but they should
    >> set it as a reasonable value or at least be below than the start link
    >> address of vmlinux.
    >
    > 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?

    Thanks,
    Rusty.


    diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
    index 32b10f53d0b4..c3bd3efec4cc 100644
    --- a/scripts/link-vmlinux.sh
    +++ b/scripts/link-vmlinux.sh
    @@ -82,7 +82,9 @@ kallsyms()
    kallsymopt="${kallsymopt} --all-symbols"
    fi

    - kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET"
    + if [ -n "${CONFIG_MMU}" ]; then
    + kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET"
    + fi

    local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
    ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"

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      Last update: 2013-11-08 01:21    [W:4.599 / U:0.632 seconds]
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