Cc: LKML <linux-kernel@...>, Andi Kleen <ak@...>, Jan Beulich <jbeulich@...>, Eduardo Pereira Habkost <ehabkost@...>, Ian Campbell <ijc@...>, H Peter Anvin <hpa@...>
Hi Ingo,
This series addresses various cleanups in pagetable allocation in the
direction of unifying 32/64 bits (that's still a while off yet).
The significant change in here is that I'm separating the lifetime of
a pmd from its pgd in the 32-bit PAE case. This makes it logically
the same as 64-bit pagetable allocation, and it overall simplifies the
code.
The patches are:
- A pure Xen fix I tacked on for convenience
- Use the same pgd_list mechanism for 32 and 64 bits
- Add an mm parameter for paravirt_alloc_pd, for consistency
- Some fixes to early_ioremap to make sure the right paravirt
hooks are called appropriately
- de-macro asm-x86/pgalloc_32.h
- make mm/pgtable_32.c:pgd_ctor a single function
- dynamically allocate pmds rather than always allocating
them with the pgd
- Add Xen bits for dealing with pmd allocation
- Preallocate pmds to avoid excessive tlb flushes
- Allocate and initialize kernel pmds when they're not shared
- Avoid excessive tlb flushes when pulling down pmds.
I've done a number of randconfig test builds to shake out various
configurations on 32 nd 64 bits.
One caveat: in order to demacro pgalloc_32.h, I had to rearrange some
headers in asm-generic/tlb.h, as it was including asm/pgalloc.h for no
good reason. As a result, any other file which was expecting to
implicitly pick up asm/pgalloc.h when including a asm/tlb.h header may
get header file problems. I have not done any cross builds to try and
track down any non-x86 fallout from this.
Thanks,
J
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