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=136525653817198&w=2 This patchset applies to git://git.cmpxchg.org/linux-mmotm.git fc374c1f9d7bdcfb851b15b86e58ac5e1f645e32 which is based on mmotm-2013-03-26-15-09. You may access the patch seriea at: git://github.com/jiangliu/linux.git mem_init_v4 V3->V4: 1) rebase to git://git.cmpxchg.org/linux-mmotm.git 2) add support for ARC and metag architectures 3) minor code refinement 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 global variable num_physpages at runtime Patch 10: Don't update num_physpages in memory_hotplug.c Patch 11-40: Modify arch mm initialization code to: 1) Simplify mem_init() by using mem_init_print_info() 2) Prepare for killing global variable num_physpages Patch 41: Kill the 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 on an x86_64 system are: Log message before applying patches: Memory: 7745676k/8910848k available (6934k kernel code, 836024k absent, 329148k reserved, 6343k data, 1012k init) Log message after applying patches: 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! Regards! Gerry Jiang Liu (41): 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/hotplug: prepare for removing num_physpages mm/alpha: prepare for removing num_physpages and simplify mem_init() mm/ARC: 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/metag: 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: kill global variable num_physpages arch/alpha/mm/init.c | 32 ++------------------- arch/alpha/mm/numa.c | 34 ++-------------------- arch/arc/mm/init.c | 36 ++--------------------- 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 | 13 +++++---- 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/metag/mm/init.c | 8 +----- 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 | 23 ++------------- 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 +- 64 files changed, 256 insertions(+), 1025 deletions(-) -- 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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