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    SubjectRe: [crash] Re: Latest brk patchset

    * Jeremy Fitzhardinge <jeremy@goop.org> wrote:

    > Ingo Molnar wrote:
    >> * Jeremy Fitzhardinge <jeremy@goop.org> wrote:
    >>
    >>
    >>> H. Peter Anvin wrote:
    >>>
    >>>> Well, the semantics are different; the .bss section is zeroed while the
    >>>> brk isn't, and the brk symbols don't necessarily point to the data
    >>>> associated with those particular symbols, unlike (of course) the bss.
    >>>>
    >>>> It's not a big issue, obviously, it just seems cleaner to me that way.
    >>>>
    >>> OK, I just added a couple of changes to:
    >>>
    >>> * make the brk reservation symbols have the form ".brk.NAME" to make
    >>> them inaccessible from C, and to make them look obviously
    >>> different from normal symbols (more like sections, since it is
    >>> their size that's more important than their address)
    >>> * Put all the brk stuff in a .brk section
    >>> * Mention alignment in the comment for the slop space
    >>>
    >>> J
    >>>
    >>> The following changes since commit 1e08816af0bc345995c3f26ce4eaba1171ffb531:
    >>> Ingo Molnar (1):
    >>> Merge branch 'linus'
    >>>
    >>> are available in the git repository at:
    >>>
    >>> git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git push/x86/brk
    >>>
    >>
    >> the previous kit in tip:x86/setup-memory is causing crashes. One of
    >> them is:
    >>
    >> init_memory_mapping: 0000000000000000-00000000377fe000
    >> 0000000000 - 00377fe000 page 4k
    >> Kernel panic - not syncing: Cannot find space
    >> for the kernel page tables Pid: 0, comm: swapper Not tainted
    >> 2.6.29-rc8-tip-02516-g83219b0-dirty #35476 Call Trace:
    >>
    >> [<c0128b7b>] panic+0x4b/0x100
    >> [<c074a989>] init_memory_mapping+0x429/0x430
    >> [<c0cde790>] setup_arch+0x430/0x890
    >> [<c0148f4e>] ?
    >> lockdep_init_map+0x2e/0x150
    >> [<c036f392>] ? __spin_lock_init+0x32/0x60
    >> [<c01298d0>] ? printk+0x20/0x30
    >> [<c0cdc966>] start_kernel+0xc6/0x330
    >> [<c0cdc321>]
    >> i386_start_kernel+0x41/0x50
    >>
    >> full crashlog below, config attached.
    >>
    >
    > What branch is this? I'm trying to build with your config
    > with current tip/master w/ tip/x86/setup-memory merged into
    > it, but "make ARCH=i386 oldconfig" is asking me about
    > CONFIG_SMP, which makes me think the config file is
    > incomplete.

    just accept the defaults in 'make oldconfig' and you'll get the
    right config.

    Ingo


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