From: Mike Rapoport <rppt@xxxxxxxxxxxxx> Hi, Currently memory map allocation for FLATMEM case does not poison the struct pages regardless of CONFIG_PAGE_POISON setting. This happens because allocation of the memory map for FLATMEM and SPARSMEM use different memblock functions and those that are used for SPARSMEM case (namely memblock_alloc_try_nid_raw() and memblock_alloc_exact_nid_raw()) implicitly poison the allocated memory. Another side effect of this implicit poisoning is that early setup code that uses the same functions to allocate memory burns cycles for the memory poisoning even if it was not intended. These patches introduce memmap_alloc() wrapper that ensure that the memory map allocation is consistent for different memory models. Mike Rapoport (4): mm/page_alloc: always initialize memory map for the holes microblaze: simplify pte_alloc_one_kernel() mm: introduce memmap_alloc() to unify memory map allocation memblock: stop poisoning raw allocations arch/microblaze/include/asm/pgtable.h | 2 -- arch/microblaze/mm/init.c | 12 ---------- arch/microblaze/mm/pgtable.c | 17 +++++++------- mm/internal.h | 4 ++++ mm/memblock.c | 20 ++++------------- mm/page_alloc.c | 32 ++++++++++++++++++--------- mm/sparse.c | 6 ++--- 7 files changed, 40 insertions(+), 53 deletions(-) base-commit: e73f0f0ee7541171d89f2e2491130c7771ba58d3 -- 2.28.0
