• Andrew Morton's avatar
    [PATCH] ppc64: allow MAP_FIXED hugepage mappings · e9acfc13
    Andrew Morton authored
    From: David Gibson <david@gibson.dropbear.id.au>
    
    On PowerPC64 the "low" hugepage range (at 2-3G for use by 32-bit processes)
    needs to be activated before it can be used.  hugetlb_get_unmapped_area()
    automatically activates the range for hugepage mappings in 32-bit processes
    which are not MAP_FIXED.  However for MAP_FIXED mmap()s, even at a suitable
    address will fail if the region is not already activated, because there is
    no suitable callback from the generic MAP_FIXED code path into the arch
    code.
    
    This patch corrects this problem and allows PPC64 to do MAP_FIXED hugepage
    mappings in the low hugepage range.
    e9acfc13
page.h 7 KB