[PATCH v4 04/19] powerpc: mm: Add p?d_large() definitions

Steven Price steven.price at arm.com
Fri Mar 8 02:50:42 PST 2019


On 08/03/2019 08:37, Mike Rapoport wrote:
> On Wed, Mar 06, 2019 at 03:50:16PM +0000, Steven Price wrote:
>> walk_page_range() is going to be allowed to walk page tables other than
>> those of user space. For this it needs to know when it has reached a
>> 'leaf' entry in the page tables. This information is provided by the
>> p?d_large() functions/macros.
>>
>> For powerpc pmd_large() was already implemented, so hoist it out of the
>> CONFIG_TRANSPARENT_HUGEPAGE condition and implement the other levels.
>>
>> Also since we now have a pmd_large always implemented we can drop the
>> pmd_is_leaf() function.
>>
>> CC: Benjamin Herrenschmidt <benh at kernel.crashing.org>
>> CC: Paul Mackerras <paulus at samba.org>
>> CC: Michael Ellerman <mpe at ellerman.id.au>
>> CC: linuxppc-dev at lists.ozlabs.org
>> CC: kvm-ppc at vger.kernel.org
>> Signed-off-by: Steven Price <steven.price at arm.com>
>> ---
>>  arch/powerpc/include/asm/book3s/64/pgtable.h | 30 ++++++++++++++------
> 
> There is one more definition of pmd_large() in
> arch/powerpc/include/asm/pgtable.h

True. That is a #define so will work correctly (it will override the
generic version). Since it is only a dummy definition (always returns 0)
it could be removed, but that would need to be in a separate patch after
the asm-generic versions have been added to avoid breaking bisection.

Steve



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