• David Gibson's avatar
    [PATCH] hugepage: is_aligned_hugepage_range() cleanup · 42b88bef
    David Gibson authored
    Quite a long time back, prepare_hugepage_range() replaced
    is_aligned_hugepage_range() as the callback from mm/mmap.c to arch code to
    verify if an address range is suitable for a hugepage mapping.
    is_aligned_hugepage_range() stuck around, but only to implement
    prepare_hugepage_range() on archs which didn't implement their own.
    Most archs (everything except ia64 and powerpc) used the same
    implementation of is_aligned_hugepage_range().  On powerpc, which
    implements its own prepare_hugepage_range(), the custom version was never
    In addition, "is_aligned_hugepage_range()" was a bad name, because it
    suggests it returns true iff the given range is a good hugepage range,
    whereas in fact it returns 0-or-error (so the sense is reversed).
    This patch cleans up by abolishing is_aligned_hugepage_range().  Instead
    prepare_hugepage_range() is defined directly.  Most archs use the default
    version, which simply checks the given region is aligned to the size of a
    hugepage.  ia64 and powerpc define custom versions.  The ia64 one simply
    checks that the range is in the correct address space region in addition to
    being suitably aligned.  The powerpc version (just as previously) checks
    for suitable addresses, and if necessary performs low-level MMU frobbing to
    set up new areas for use by hugepages.
    No libhugetlbfs testsuite regressions on ppc64 (POWER5 LPAR).
    Signed-off-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
    Signed-off-by: default avatarZhang Yanmin <yanmin.zhang@intel.com>
    Cc: "David S. Miller" <davem@davemloft.net>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: William Lee Irwin III <wli@holomorphy.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>