The original goal of this patchset is to fix the bug reported by https://bugzilla.kernel.org/show_bug.cgi?id=53501 Now it has also been expanded to reduce common code used by memory initializion. This is the last part, previous three patch sets could be accessed at: http://marc.info/?l=linux-mm&m=136289696323825&w=2 http://marc.info/?l=linux-mm&m=136290291524901&w=2 http://marc.info/?l=linux-mm&m=136345342831592&w=2 This patchset applies to https://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git since-3.8 Patch 1-7: 1) add comments for global variables exported by vmlinux.lds 2) normalize global variables exported by vmlinux.lds Patch 8: Introduce helper functions mem_init_print_info() and get_num_physpages() Patch 9: Avoid using num_physpages at runtime Patch 10-38: 1) Simplify mem_init() by using mem_init_print_info() 2) Prepare fore kill global variable num_physpages Patch 39: Kill global variable num_physpages With all patches applied, mem_init(), free_initmem(), free_initrd_mem() could be as simple as below. This patch series has reduced about 1.2K lines of code in total. #ifndef CONFIG_DISCONTIGMEM void __init mem_init(void) { max_mapnr = max_low_pfn; free_all_bootmem(); high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); mem_init_print_info(NULL); } #endif /* CONFIG_DISCONTIGMEM */ void free_initmem(void) { free_initmem_default(-1); } #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { free_reserved_area(start, end, -1, "initrd"); } #endif Due to hardware resource limitations, I have only tested this on x86_64. And the messages reported are: Previous log message: Memory: 7745676k/8910848k available (6934k kernel code, 836024k absent, 329148k reserved, 6343k data, 1012k init) Current log message: Memory: 7744624K/8074824K available (6969K kernel code, 1011K data, 2828K rodata, 1016K init, 9640K bss, 330200K reserved) Any help to review or test these patch series are welcomed! Jiang Liu (39): vmlinux.lds: add comments for global variables and clean up useless declarations avr32: normalize global variables exported by vmlinux.lds c6x: normalize global variables exported by vmlinux.lds h8300: normalize global variables exported by vmlinux.lds score: normalize global variables exported by vmlinux.lds tile: normalize global variables exported by vmlinux.lds UML: normalize global variables exported by vmlinux.lds mm: introduce helper function mem_init_print_info() to simplify mem_init() mm: use totalram_pages instead of num_physpages at runtime mm/alpha: prepare for removing num_physpages and simplify mem_init() mm/ARM: prepare for removing num_physpages and simplify mem_init() mm/ARM64: prepare for removing num_physpages and simplify mem_init() mm/AVR32: prepare for removing num_physpages and simplify mem_init() mm/blackfin: prepare for removing num_physpages and simplify mem_init() mm/c6x: prepare for removing num_physpages and simplify mem_init() mm/cris: prepare for removing num_physpages and simplify mem_init() mm/frv: prepare for removing num_physpages and simplify mem_init() mm/h8300: prepare for removing num_physpages and simplify mem_init() mm/hexagon: prepare for removing num_physpages and simplify mem_init() mm/IA64: prepare for removing num_physpages and simplify mem_init() mm/m32r: prepare for removing num_physpages and simplify mem_init() mm/m68k: prepare for removing num_physpages and simplify mem_init() mm/microblaze: prepare for removing num_physpages and simplify mem_init() mm/MIPS: prepare for removing num_physpages and simplify mem_init() mm/mn10300: prepare for removing num_physpages and simplify mem_init() mm/openrisc: prepare for removing num_physpages and simplify mem_init() mm/PARISC: prepare for removing num_physpages and simplify mem_init() mm/ppc: prepare for removing num_physpages and simplify mem_init() mm/s390: prepare for removing num_physpages and simplify mem_init() mm/score: prepare for removing num_physpages and simplify mem_init() mm/SH: prepare for removing num_physpages and simplify mem_init() mm/SPARC: prepare for removing num_physpages and simplify mem_init() mm/tile: prepare for removing num_physpages and simplify mem_init() mm/um: prepare for removing num_physpages and simplify mem_init() mm/unicore32: prepare for removing num_physpages and simplify mem_init() mm/x86: prepare for removing num_physpages and simplify mem_init() mm/xtensa: prepare for removing num_physpages and simplify mem_init() mm/hotplug: prepare for removing num_physpages mm: kill global variable num_physpages arch/alpha/mm/init.c | 32 ++------------------- arch/alpha/mm/numa.c | 34 ++++------------------ arch/arm/mm/init.c | 47 ++---------------------------- arch/arm64/mm/init.c | 48 ++----------------------------- arch/avr32/kernel/setup.c | 2 +- arch/avr32/kernel/vmlinux.lds.S | 4 +-- arch/avr32/mm/init.c | 29 +++---------------- arch/blackfin/mm/init.c | 38 ++++--------------------- arch/c6x/kernel/vmlinux.lds.S | 4 +-- arch/c6x/mm/init.c | 11 +------ arch/cris/mm/init.c | 33 ++------------------- arch/frv/kernel/setup.c | 14 ++++----- arch/frv/mm/init.c | 49 +++++++++---------------------- arch/h8300/boot/compressed/misc.c | 1 - arch/h8300/kernel/vmlinux.lds.S | 2 ++ arch/h8300/mm/init.c | 34 ++++++---------------- arch/hexagon/mm/init.c | 3 +- arch/ia64/mm/contig.c | 11 ------- arch/ia64/mm/discontig.c | 3 -- arch/ia64/mm/init.c | 27 +----------------- arch/m32r/mm/discontig.c | 6 +--- arch/m32r/mm/init.c | 49 ++++--------------------------- arch/m68k/mm/init.c | 31 ++------------------ arch/microblaze/mm/init.c | 51 ++++----------------------------- arch/mips/mm/init.c | 57 ++++++++++++------------------------- arch/mips/pci/pci-lantiq.c | 2 +- arch/mips/sgi-ip27/ip27-memory.c | 21 ++------------ arch/mn10300/mm/init.c | 26 ++--------------- arch/openrisc/mm/init.c | 44 +++------------------------- arch/parisc/mm/init.c | 46 ++---------------------------- arch/powerpc/mm/mem.c | 56 ++++++++---------------------------- arch/s390/mm/init.c | 17 ++--------- arch/score/kernel/vmlinux.lds.S | 1 + arch/score/mm/init.c | 26 ++--------------- arch/sh/mm/init.c | 25 +++------------- arch/sparc/kernel/leon_smp.c | 3 -- arch/sparc/mm/init_32.c | 33 ++------------------- arch/sparc/mm/init_64.c | 27 ++---------------- arch/tile/include/asm/sections.h | 2 +- arch/tile/kernel/setup.c | 20 ++++++------- arch/tile/kernel/vmlinux.lds.S | 4 ++- arch/tile/mm/init.c | 17 ++--------- arch/um/include/asm/common.lds.S | 1 - arch/um/kernel/dyn.lds.S | 6 ++-- arch/um/kernel/mem.c | 4 +-- arch/um/kernel/uml.lds.S | 7 +++-- arch/unicore32/mm/init.c | 49 ++----------------------------- arch/x86/kernel/cpu/amd.c | 2 +- arch/x86/kernel/setup.c | 2 -- arch/x86/mm/init_32.c | 30 ++----------------- arch/x86/mm/init_64.c | 20 +------------ arch/x86/mm/numa_32.c | 2 -- arch/xtensa/mm/init.c | 27 ++---------------- fs/fuse/inode.c | 2 +- include/asm-generic/sections.h | 21 +++++++++++++- include/linux/mm.h | 13 ++++++++- kernel/power/snapshot.c | 4 +-- mm/memory.c | 2 -- mm/memory_hotplug.c | 4 --- mm/nommu.c | 2 -- mm/page_alloc.c | 52 +++++++++++++++++++++++++++++++++ net/ipv4/inet_fragment.c | 2 +- 62 files changed, 256 insertions(+), 986 deletions(-) -- 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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