Commit 09325873 authored by Yinghai Lu's avatar Yinghai Lu Committed by Tejun Heo

bootmem: Separate out CONFIG_NO_BOOTMEM code into nobootmem.c

mm/bootmem.c contained code paths for both bootmem and no bootmem
configurations.  They implement about the same set of APIs in
different ways and as a result bootmem.c contains massive amount of

Separate out CONFIG_NO_BOOTMEM code into mm/nobootmem.c.  As the
common part is relatively small, duplicate them in nobootmem.c instead
of creating a common file or ifdef'ing in bootmem.c.

The followings are duplicated.

* {min|max}_low_pfn, max_pfn, saved_max_pfn
* free_bootmem_late()
* ___alloc_bootmem()
* __alloc_bootmem_low()

The followings are applicable only to nobootmem and moved verbatim.

* __free_pages_memory()
* free_all_memory_core_early()

The followings are not applicable to nobootmem and omitted in

* reserve_bootmem_node()
* reserve_bootmem()

The rest split function bodies according to CONFIG_NO_BOOTMEM.

Makefile is updated so that only either bootmem.c or nobootmem.c is
built according to CONFIG_NO_BOOTMEM.

This patch doesn't introduce any behavior change.

-tj: Rewrote commit description.
Suggested-by: default avatarIngo Molnar <>
Signed-off-by: default avatarYinghai Lu <>
Acked-by: default avatarAndrew Morton <>
Signed-off-by: default avatarTejun Heo <>
parent 2bf50555
......@@ -7,7 +7,7 @@ mmu-$(CONFIG_MMU) := fremap.o highmem.o madvise.o memory.o mincore.o \
mlock.o mmap.o mprotect.o mremap.o msync.o rmap.o \
vmalloc.o pagewalk.o pgtable-generic.o
obj-y := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
obj-y := filemap.o mempool.o oom_kill.o fadvise.o \
maccess.o page_alloc.o page-writeback.o \
readahead.o swap.o truncate.o vmscan.o shmem.o \
prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \
......@@ -15,6 +15,12 @@ obj-y := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
obj-y += init-mm.o
obj-y += nobootmem.o
obj-y += bootmem.o
obj-$(CONFIG_HAVE_MEMBLOCK) += memblock.o
obj-$(CONFIG_BOUNCE) += bounce.o
This diff is collapsed.
This diff is collapsed.
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment