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Subject[PATCHSET linux-2.6-x86:tip] x86: make percpu offsets zero-based on SMP
Date
Hello,

This patchset is re-hash of Mike Travis' original work on zero-based
percpu offsets. I couldn't get the original patches working (where is
the linker script changes other than the PHDR addition?) and ended up
doing a quite similar series of patches. A lot of this patch series
was copied verbatim from or got a lot of hints from Mike Travis'
original patches. Some differences are...

* better splitted - one thing at a time.

* how the pda is allocated at the head. this patch uses preallocation
directly from linker script as it's something arch specific anyway.

* pda ops are wrappers around x86 percpu ops.

* x86-32 SMP is also converted to zero-based offsets, so we should be
able to do cpualloc (or whatever) for both subarchs.

This patchset contains the following thirteen patches.

0001-x86_64-fix-pda_to_op.patch
0002-x86-make-early_per_cpu-a-lvalue-and-use-it.patch
0003-x86_64-Cleanup-early-setup_percpu-references.patch
0004-x86_32-make-vmlinux_32.lds.S-use-PERCPU-macro.patch
0005-x86_64-make-percpu-symbols-zerobased-on-SMP.patch
0006-x86_64-load-pointer-to-pda-into-gs-while-brining-u.patch
0007-x86_64-use-static-_cpu_pda-array.patch
0008-x86_64-fold-pda-into-percpu-area-on-SMP.patch
0009-x86_64-merge-64-and-32-SMP-percpu-handling.patch
0010-x86_64-make-pda-a-percpu-variable.patch
0011-x86_64-convert-pda-ops-to-wrappers-around-x86-percp.patch
0012-x86_64-misc-clean-up-after-the-percpu-update.patch
0013-x86_32-make-percpu-symbols-zerobased-on-SMP.patch

0001-0004 prepares for coming changes. 0005 converts x86_64 SMP
percpu to zero based offset. 0006-0007 preps for percpu/pda
simplification. 0008-0012 unifies percpu and pda handling
step-by-step. 0013 converts x86_32 SMP percpu to zer based offset.

Each step was tested with gcc-4.1.3, 4.2.3 and 4.3.1 on x86_64, 4.3.1
on i386 for both SMP and UP configurations. The final state is
currently being tested using 4.2.3 on both x86_64 and 32.

This patchset is on top of the current linux-2.6-x86:tip[1] and also
available in the following git tree.

http://git.kernel.org/?p=linux/kernel/git/tj/misc.git;a=shortlog;h=x86-percpu-zerobased
git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git x86-percpu-zerobased

arch/x86/include/asm/pda.h | 97 ++--------------------
arch/x86/include/asm/percpu.h | 137 ++++++++++++-------------------
arch/x86/include/asm/setup.h | 1
arch/x86/include/asm/smp.h | 2
arch/x86/include/asm/topology.h | 5 -
arch/x86/include/asm/trampoline.h | 1
arch/x86/kernel/acpi/sleep.c | 1
arch/x86/kernel/apic.c | 13 ---
arch/x86/kernel/asm-offsets_64.c | 2
arch/x86/kernel/cpu/common.c | 17 ++-
arch/x86/kernel/entry_64.S | 7 -
arch/x86/kernel/head64.c | 23 -----
arch/x86/kernel/head_32.S | 37 +++++++-
arch/x86/kernel/head_64.S | 47 +++++++++-
arch/x86/kernel/setup_percpu.c | 156 +++++++++++++++++++-----------------
arch/x86/kernel/smpboot.c | 61 --------------
arch/x86/kernel/smpcommon.c | 3
arch/x86/kernel/vmlinux_32.lds.S | 23 +++--
arch/x86/kernel/vmlinux_64.lds.S | 22 ++++-
arch/x86/kernel/x8664_ksyms_64.c | 2
arch/x86/mach-voyager/voyager_smp.c | 2
arch/x86/xen/enlighten.c | 2
arch/x86/xen/smp.c | 10 --
include/asm-generic/sections.h | 2
include/asm-generic/vmlinux.lds.h | 74 +++++++++++++++--
25 files changed, 353 insertions(+), 394 deletions(-)
Thanks.

--
tejun

[1] c69feb89654622a77c5a8d8e5b20e3dbe0a7a92b


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