ia64: allocate percpu area for cpu0 like percpu areas for other cpus

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cpu0 used special percpu area reserved by the linker, __cpu0_per_cpu,
which is set up early in boot by head.S.  However, this doesn't
guarantee that the area will be on the same node as cpu0 and the
percpu area for cpu0 ends up very far away from percpu areas for other
cpus which cause problems for congruent percpu allocator.

This patch makes percpu area initialization allocate percpu area for
cpu0 like any other cpus and copy it from __cpu0_per_cpu which now
resides in the __init area.  This means that for cpu0, percpu area is
first setup at __cpu0_per_cpu early by head.S and then moved to an
area in the linear mapping during memory initialization and it's not
allowed to take a pointer to percpu variables between head.S and
memory initialization.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: linux-ia64 <linux-ia64@vger.kernel.org>

...

This commit is contained in:

Tejun Heo 2009-10-02 13:28:56 +09:00

parent 12cda81777

commit 36886478f5

3 changed files with 57 additions and 30 deletions

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11

arch/ia64/kernel/vmlinux.lds.S

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41

arch/ia64/mm/contig.c

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35

arch/ia64/mm/discontig.c

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