• Haren Myneni's avatar
    [PATCH] fix in __alloc_bootmem_core() when there is no free page in first node's memory · 66d43e98
    Haren Myneni authored
    Hitting BUG_ON() in __alloc_bootmem_core() when there is no free page
    available in the first node's memory.  For the case of kdump on PPC64
    (Power 4 machine), the captured kernel is used two memory regions - memory
    for TCE tables (tce-base and tce-size at top of RAM and reserved) and
    captured kernel memory region (crashk_base and crashk_size).  Since we
    reserve the memory for the first node, we should be returning from
    __alloc_bootmem_core() to search for the next node (pg_dat).
    Currently, find_next_zero_bit() is returning the n^th bit (eidx) when there
    is no free page.  Then, test_bit() is failed since we set 0xff only for the
    actual size initially (init_bootmem_core()) even though rounded up to one
    page for bdata->node_bootmem_map.  We are hitting the BUG_ON after failing
    to enter second "for" loop.
    Signed-off-by: default avatarHaren Myneni <haren@us.ibm.com>
    Cc: Andy Whitcroft <apw@shadowen.org>
    Cc: Dave Hansen <haveblue@us.ibm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>