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    [PATCH] unpaged: unifdefed PageCompound · 664beed0
    Hugh Dickins 提交于
    It looks like snd_xxx is not the only nopage to be using PageReserved as a way
    of holding a high-order page together: which no longer works, but is masked by
    our failure to free from VM_RESERVED areas.  We cannot fix that bug without
    first substituting another way to hold the high-order page together, while
    farming out the 0-order pages from within it.
    
    That's just what PageCompound is designed for, but it's been kept under
    CONFIG_HUGETLB_PAGE.  Remove the #ifdefs: which saves some space (out- of-line
    put_page), doesn't slow down what most needs to be fast (already using
    hugetlb), and unifies the way we handle high-order pages.
    Signed-off-by: NHugh Dickins <hugh@veritas.com>
    Signed-off-by: NAndrew Morton <akpm@osdl.org>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    664beed0
page-flags.h 12.5 KB