• Benjamin Herrenschmidt's avatar
    memblock: Introduce default allocation limit and use it to replace explicit ones · e63075a3
    Benjamin Herrenschmidt authored
    This introduce memblock.current_limit which is used to limit allocations
    from memblock_alloc() or memblock_alloc_base(..., MEMBLOCK_ALLOC_ACCESSIBLE).
    
    The old MEMBLOCK_ALLOC_ANYWHERE changes value from 0 to ~(u64)0 and can still
    be used with memblock_alloc_base() to allocate really anywhere.
    
    It is -no-longer- cropped to MEMBLOCK_REAL_LIMIT which disappears.
    
    Note to archs: I'm leaving the default limit to MEMBLOCK_ALLOC_ANYWHERE. I
    strongly recommend that you ensure that you set an appropriate limit
    during boot in order to guarantee that an memblock_alloc() at any time
    results in something that is accessible with a simple __va().
    
    The reason is that a subsequent patch will introduce the ability for
    the array to resize itself by reallocating itself. The MEMBLOCK core will
    honor the current limit when performing those allocations.
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    e63075a3
memblock.h 164 Bytes