[PATCH 00/13] arch, mm: reduce code duplication in mem_init()

Mike Rapoport
2025-03-06T18:51:45Z

Hi,

Every architecture has implementation of mem_init() function and some
even more than one. All these release free memory to the buddy
allocator, most of them set high_memory to the end of directly
addressable memory and many of them set max_mapnr for FLATMEM case.

These patches pull the commonalities into the generic code and refactor
some of the mem_init() implementations so that many of them can be just
dropped.

Mike Rapoport (Microsoft) (13):
arm: mem_init: use memblock_phys_free() to free DMA memory on SA1111
csky: move setup_initrd() to setup.c
hexagon: move initialization of init_mm.context init to paging_init()
MIPS: consolidate mem_init() for NUMA machines
MIPS: make setup_zero_pages() use memblock
nios2: move pr_debug() about memory start and end to setup_arch()
s390: make setup_zero_pages() use memblock
xtensa: split out printing of virtual memory layout to a function
arch, mm: set max_mapnr when allocating memory map for FLATMEM
arch, mm: set high_memory in free_area_init()
arch, mm: streamline HIGHMEM freeing
arch, mm: introduce arch_mm_preinit
arch, mm: make releasing of memory to page allocator more explicit

arch/alpha/mm/init.c | 8 ----
arch/arc/mm/init.c | 25 +----------
arch/arm/mm/init.c | 43 +------------------
arch/arm/mm/mmu.c | 2 -
arch/arm/mm/nommu.c | 1 -
arch/arm64/mm/init.c | 12 +-----
arch/csky/kernel/setup.c | 43 +++++++++++++++++++
arch/csky/mm/init.c | 67 ------------------------------
arch/hexagon/mm/init.c | 32 ++------------
arch/loongarch/kernel/numa.c | 6 ---
arch/loongarch/mm/init.c | 8 ----
arch/m68k/mm/init.c | 4 --
arch/m68k/mm/mcfmmu.c | 1 -
arch/m68k/mm/motorola.c | 2 -
arch/m68k/sun3/config.c | 1 -
arch/microblaze/mm/init.c | 25 -----------
arch/mips/include/asm/mmzone.h | 2 -
arch/mips/loongson64/numa.c | 7 ----
arch/mips/mm/init.c | 49 ++++------------------
arch/mips/sgi-ip27/ip27-memory.c | 9 ----
arch/nios2/kernel/setup.c | 3 +-
arch/nios2/mm/init.c | 16 +------
arch/openrisc/mm/init.c | 6 ---
arch/parisc/mm/init.c | 4 --
arch/powerpc/kernel/setup-common.c | 3 --
arch/powerpc/mm/mem.c | 18 +-------
arch/riscv/mm/init.c | 5 +--
arch/s390/mm/init.c | 18 +-------
arch/sh/mm/init.c | 10 -----
arch/sparc/mm/init_32.c | 31 +-------------
arch/sparc/mm/init_64.c | 4 --
arch/um/include/shared/mem_user.h | 1 -
arch/um/kernel/mem.c | 9 ++--
arch/um/kernel/physmem.c | 12 ------
arch/um/kernel/um_arch.c | 2 -
arch/x86/include/asm/highmem.h | 3 --
arch/x86/include/asm/numa.h | 4 --
arch/x86/include/asm/numa_32.h | 13 ------
arch/x86/kernel/setup.c | 2 -
arch/x86/mm/Makefile | 2 -
arch/x86/mm/highmem_32.c | 34 ---------------
arch/x86/mm/init_32.c | 41 ++----------------
arch/x86/mm/init_64.c | 7 ++--
arch/x86/mm/numa_32.c | 3 --
arch/xtensa/mm/init.c | 66 +++++++----------------------
include/asm-generic/memory_model.h | 5 ++-
include/linux/memblock.h | 1 -
include/linux/mm.h | 13 +-----
mm/internal.h | 3 +-
mm/memblock.c | 3 +-
mm/memory.c | 16 -------
mm/mm_init.c | 58 ++++++++++++++++++++++----
mm/nommu.c | 6 ---
53 files changed, 151 insertions(+), 618 deletions(-)
delete mode 100644 arch/x86/include/asm/numa_32.h
delete mode 100644 arch/x86/mm/highmem_32.c

base-commit: d082ecbc71e9e0bf49883ee4afd435a77a5101b6
--
2.47.2