From: Greg KH <[email protected]> 3.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Gavin Shan <[email protected]> commit 4e2f07750d9a94e8f23e86408df5ab95be88bf11 upstream. The overall memblock has been organized into the memory regions and reserved regions. Initially, the memory regions and reserved regions are stored in the predetermined arrays of "struct memblock _region". It's possible for the arrays to be enlarged when we have newly added regions for them, but no enough space there. Under the situation, We will created double-sized array to meet the requirement. However, the original implementation converted the VA (Virtual Address) of the newly allocated array of regions to PA (Physical Address), then translate back when we allocates the new array from slab. That's actually unnecessary. The patch removes the duplicate VA/PA conversion. Signed-off-by: Gavin Shan <[email protected]> Cc: Johannes Weiner <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- mm/memblock.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/mm/memblock.c +++ b/mm/memblock.c @@ -212,14 +212,15 @@ static int __init_memblock memblock_doub if (use_slab) { new_array = kmalloc(new_size, GFP_KERNEL); addr = new_array ? __pa(new_array) : 0; - } else + } else { addr = memblock_find_in_range(0, MEMBLOCK_ALLOC_ACCESSIBLE, new_size, sizeof(phys_addr_t)); + new_array = addr ? __va(addr) : 0; + } if (!addr) { pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n", memblock_type_name(type), type->max, type->max * 2); return -1; } - new_array = __va(addr); memblock_dbg("memblock: %s array is doubled to %ld at [%#010llx-%#010llx]", memblock_type_name(type), type->max * 2, (u64)addr, (u64)addr + new_size - 1); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
