sparc32: mm: Only call ctor()/dtor() functions for first and last user

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The SRMMU page-table allocator allocates multiple PTE tables per page,
since they are only 1K in size. However, this means that calls to
pgtable_pte_page_{ctor,dtor}() must be serialised and performed only by
the first and last page-table allocation for the page respectively.

Use the page reference count to track how many PTE tables we have
allocated for a given page returned by the SRMMU allocator and only
call the ctor()/dtor() functions for the first and last user respectively.

Cc: David S. Miller <davem@davemloft.net>
Fixes: 8c8f3156dd ("sparc32: mm: Reduce allocation size for PMD and PTE tables")
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Will Deacon 2020-05-26 18:33:02 +01:00 • committed by David S. Miller

parent 60bccaa671

commit 1996d47a0d

1 changed files with 11 additions and 3 deletions

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arch/sparc/mm/srmmu.c

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