path: root/mm/pgtable-generic.c
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authorAneesh Kumar K.V <>2015-06-24 16:57:39 -0700
committerLinus Torvalds <>2015-06-24 17:49:44 -0700
commit15a25b2ead5f97c5a63c169186e294b41ce03f9a (patch)
tree0c320617ac70baca1dd96c8d2b13f6ac2460cc25 /mm/pgtable-generic.c
parent97f0b13452198290799fd6780f05fbaa74f927d3 (diff)
mm/thp: split out pmd collapse flush into separate functions
Architectures like ppc64 [1] need to do special things while clearing pmd before a collapse. For them this operation is largely different from a normal hugepage pte clear. Hence add a separate function to clear pmd before collapse. After this patch pmdp_* functions operate only on hugepage pte, and not on regular pmd_t values pointing to page table. [1] ppc64 needs to invalidate all the normal page pte mappings we already have inserted in the hardware hash page table. But before doing that we need to make sure there are no parallel hash page table insert going on. So we need to do a kick_all_cpus_sync() before flushing the older hash table entries. By moving this to a separate function we capture these details and mention how it is different from a hugepage pte clear. This patch is a cleanup and only does code movement for clarity. There should not be any change in functionality. Signed-off-by: Aneesh Kumar K.V <> Acked-by: Kirill A. Shutemov <> Cc: Benjamin Herrenschmidt <> Cc: Paul Mackerras <> Cc: Michael Ellerman <> Cc: Andrea Arcangeli <> Cc: Martin Schwidefsky <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'mm/pgtable-generic.c')
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