sparc32: mm: Disable SPLIT_PTLOCK_CPUS

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The SRMMU page-table allocator is not compatible with SPLIT_PTLOCK_CPUS
for two major reasons:

  1. Pages are allocated via memblock, and therefore the ptl is not
     cleared by prep_new_page(), which is expected by ptlock_init()

  2. Multiple PTE tables can exist in a single page, causing them to
     share the same ptl and deadlock when attempting to take the same
     lock twice (e.g. as part of copy_page_range()).

Ensure that SPLIT_PTLOCK_CPUS is not selected for SPARC32.

Cc: David S. Miller <davem@davemloft.net>
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 18:33:01 +01:00 • committed by David S. Miller

parent 454b0289c6

commit 60bccaa671

1 changed files with 4 additions and 0 deletions

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