[PATCH v6, part4 00/41] Simplify mem_init() implementations and kill num_physpages

From: Jiang Liu
Date: Wed May 29 2013 - 10:11:49 EST

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This patchset applies to
git://git.cmpxchg.org/linux-mmotm.git v3.10-rc2-mmotm-2013-05-22-16-40

You may access the patch seriea at:
git://github.com/jiangliu/linux.git mem_init_v6

Great thanks to Vineet Gupta <vgupta@xxxxxxxxxxxx> for testing on ARC.

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=136957567120179&w=2

V5->V6:
1) address review comments
2) rebase to v3.10-rc2-mmotm-2013-05-22-16-40

V4->V5:
1) rebase to v3.9-rc8-mmotm-2013-04-25-16-24
2) address comments from previous round of review

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 | 36 ++++++-------------------
arch/hexagon/mm/init.c | 4 +--
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 | 47 +++-----------------------------
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 | 34 +++--------------------
arch/sparc/mm/init_64.c | 24 +++--------------
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, 258 insertions(+), 1029 deletions(-)

--
1.8.1.2

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Next message: Fengguang Wu: "[ring_buffer_entries] BUG: unable to handle kernel NULL pointerdereference at (null)"
Previous message: Jiang Liu: "[PATCH v6, part4 05/41] score: normalize global variables exported by vmlinux.lds"
Next in thread: Jiang Liu: "[PATCH v6, part4 01/41] vmlinux.lds: add comments for global variables and clean up useless declarations"
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