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    SubjectRe: [crash] Re: Latest brk patchset
    Ingo Molnar wrote:
    > * 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.
    >

    Got some build failures due to warnings treated as errors. And the
    resulting kernel booted fine under qemu with 1Gbyte of memory. I'll try
    on real hardware a bit later, but it doesn't seem like something that
    should be affected by qemu vs native, unless it has something to do with
    the specific e820 map.

    J


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