ALLOC_CONTIG_RANGE(9)               Memory Management in Linux              ALLOC_CONTIG_RANGE(9)



NAME
       alloc_contig_range - - tries to allocate given range of pages

SYNOPSIS
       int alloc_contig_range(unsigned long start, unsigned long end, unsigned migratetype);

ARGUMENTS
       start
           start PFN to allocate

       end
           one-past-the-last PFN to allocate

       migratetype
           migratetype of the underlaying pageblocks (either #MIGRATE_MOVABLE or #MIGRATE_CMA).
           All pageblocks in range must have the same migratetype and it must be either of the
           two.

DESCRIPTION
       The PFN range does not have to be pageblock or MAX_ORDER_NR_PAGES aligned, however it's
       the caller's responsibility to guarantee that we are the only thread that changes migrate
       type of pageblocks the pages fall in.

       The PFN range must belong to a single zone.

       Returns zero on success or negative error code. On success all pages which PFN is in
       [start, end) are allocated for the caller and need to be freed with free_contig_range.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                     ALLOC_CONTIG_RANGE(9)