• Atsushi Kumagai's avatar
    kexec: update VMCOREINFO for compound_order/dtor · 8639a847
    Atsushi Kumagai authored
    makedumpfile refers page.lru.next to get the order of compound pages for
    page filtering.
    However, now the order is stored in page.compound_order, hence
    VMCOREINFO should be updated to export the offset of
    The fact is, page.compound_order was introduced already in kernel 4.0,
    but the offset of it was the same as page.lru.next until kernel 4.3, so
    this was not actual problem.
    The above can be said also for page.lru.prev and page.compound_dtor,
    it's necessary to detect hugetlbfs pages.  Further, the content was
    changed from direct address to the ID which means dtor.
    The problem is that unnecessary hugepages won't be removed from a dump
    file in kernels 4.4.x and later.  This means that extra disk space would
    be consumed.  It's a problem, but not critical.
    Signed-off-by: default avatarAtsushi Kumagai <ats-kumagai@wm.jp.nec.com>
    Acked-by: default avatarDave Young <dyoung@redhat.com>
    Cc: "Eric W. Biederman" <ebiederm@xmission.com>
    Cc: Vivek Goyal <vgoyal@redhat.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
kexec_core.c 38.9 KB