[PATCH 0/15] Improve x86 smpboot integration

[Glauber Costa <gcosta@redhat.com>]

Ingo,

First of all, sorry for being away for so long ;-)

Here it goes a series of improvements for the x86 smpboot integration.
The final goal is the same: To reduce the difference between architectures,
just this time I do a little bit more ;-)

Basically, this one reduces greatly the ifdef count:

[root@t60 linux-2.6-x86]# git-show 674ce:arch/x86/kernel/smpboot.c \
			  | grep -e "^#ifdef \+CONFIG_X86_\(32\|64\)" | wc -l
18
[root@t60 linux-2.6-x86]# git-show HEAD:arch/x86/kernel/smpboot.c \
			  | grep -e "^#ifdef \+CONFIG_X86_\(32\|64\)" | wc -l
8

The remaining ones are _mainly_ (not all) due to the fact that x86_64 uses the pda,
while i386 goes with normal per-cpu data. They are things like:

per_cpu(current_task, cpu) = c_idle.idle; vs cpu_pda(cpu)->pcurrent = c_idle.idle;

Also, there is the low mappings piece of code Hugh detected. To that, I intend
to also find a common base between them. Just I'm not doing it in this series, because
it deserves special attention.

As usual, this series was compiled tested in a whole bunch of different configs ( ~ 10
for each architecture), including all i386 variants. Boot tested in all my hardware.

The final diffstat is:

 arch/x86/kernel/head_32.S             |    2 
 arch/x86/kernel/head_64.S             |   48 +---------------
 arch/x86/kernel/io_apic_32.c          |    2 
 arch/x86/kernel/setup64.c             |    1 
 arch/x86/kernel/smpboot.c             |   97 ++++------------------------------
 b/arch/x86/kernel/acpi/sleep.c        |    2 
 b/arch/x86/kernel/apic_32.c           |    6 --
 b/arch/x86/kernel/apic_64.c           |   10 +++
 b/arch/x86/kernel/head_32.S           |    6 +-
 b/arch/x86/kernel/head_64.S           |    5 +
 b/arch/x86/kernel/io_apic_32.c        |    5 +
 b/arch/x86/kernel/io_apic_64.c        |    9 ++-
 b/arch/x86/kernel/process_32.c        |   16 +++++
 b/arch/x86/kernel/setup64.c           |    5 -
 b/arch/x86/kernel/setup_64.c          |   27 +++++++++
 b/arch/x86/kernel/smpboot.c           |    8 --
 b/arch/x86/kernel/traps_32.c          |    3 -
 b/arch/x86/kernel/x8664_ksyms_64.c    |    5 -
 b/arch/x86/mach-voyager/voyager_smp.c |    2 
 b/include/asm-x86/desc.h              |   24 +++-----
 b/include/asm-x86/hw_irq.h            |    3 -
 b/include/asm-x86/numa_32.h           |    1 
 b/include/asm-x86/segment.h           |   24 ++++----
 b/include/asm-x86/smp.h               |    2 
 include/asm-x86/hw_irq.h              |    4 -
 25 files changed, 122 insertions(+), 195 deletions(-)