The patch titled Subject: x86/mm: implement free pmd/pte page interfaces has been added to the -mm tree. Its filename is x86-mm-implement-free-pmd-pte-page-interfaces.patch

This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/x86-mm-implement-free-pmd-pte-page-... and later at http://ozlabs.org/~akpm/mmotm/broken-out/x86-mm-implement-free-pmd-pte-page-...

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------------------------------------------------------ From: Toshi Kani toshi.kani@hpe.com Subject: x86/mm: implement free pmd/pte page interfaces

Implement pud_free_pmd_page() and pmd_free_pte_page() on x86, which clear a given pud/pmd entry and free up lower level page table(s). Address range associated with the pud/pmd entry must have been purged by INVLPG.

Link: http://lkml.kernel.org/r/20180314180155.19492-3-toshi.kani@hpe.com Fixes: e61ce6ade404e ("mm: change ioremap to set up huge I/O mappings") Signed-off-by: Toshi Kani toshi.kani@hpe.com Reported-by: Lei Li lious.lilei@hisilicon.com Cc: Michal Hocko mhocko@suse.com Cc: Thomas Gleixner tglx@linutronix.de Cc: Ingo Molnar mingo@redhat.com Cc: "H. Peter Anvin" hpa@zytor.com Cc: Borislav Petkov bp@suse.de Cc: Matthew Wilcox willy@infradead.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

arch/x86/mm/pgtable.c | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-)

diff -puN arch/x86/mm/pgtable.c~x86-mm-implement-free-pmd-pte-page-interfaces arch/x86/mm/pgtable.c --- a/arch/x86/mm/pgtable.c~x86-mm-implement-free-pmd-pte-page-interfaces +++ a/arch/x86/mm/pgtable.c @@ -712,7 +712,22 @@ int pmd_clear_huge(pmd_t *pmd) */ int pud_free_pmd_page(pud_t *pud) { - return pud_none(*pud); + pmd_t *pmd; + int i; + + if (pud_none(*pud)) + return 1; + + pmd = (pmd_t *)pud_page_vaddr(*pud); + + for (i = 0; i < PTRS_PER_PMD; i++) + if (!pmd_free_pte_page(&pmd[i])) + return 0; + + pud_clear(pud); + free_page((unsigned long)pmd); + + return 1; }

/** @@ -724,6 +739,15 @@ int pud_free_pmd_page(pud_t *pud) */ int pmd_free_pte_page(pmd_t *pmd) { - return pmd_none(*pmd); + pte_t *pte; + + if (pmd_none(*pmd)) + return 1; + + pte = (pte_t *)pmd_page_vaddr(*pmd); + pmd_clear(pmd); + free_page((unsigned long)pte); + + return 1; } #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ _

Patches currently in -mm which might be from toshi.kani@hpe.com are

mm-vmalloc-add-interfaces-to-free-unmapped-page-table.patch x86-mm-implement-free-pmd-pte-page-interfaces.patch