track_pfn_insert() is marking dax mappings as uncacheable. It is used to keep mappings attributes consistent across a remapped range. However, since dax regions are never registered via track_pfn_remap(), the caching mode lookup for dax pfns always returns _PAGE_CACHE_MODE_UC. We do not use track_pfn_insert() in the dax-pte path, and we always want to use the pgprot of the vma itself, so drop this call.
Cc: Ross Zwisler <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Kirill A. Shutemov <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Nilesh Choudhury <[email protected]> Reported-by: Kai Zhang <[email protected]> Reported-by: Toshi Kani <[email protected]> Cc: <[email protected]> Signed-off-by: Dan Williams <[email protected]> --- mm/huge_memory.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index a6abd76baa72..338eff05c77a 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -676,8 +676,6 @@ int vmf_insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, if (addr < vma->vm_start || addr >= vma->vm_end) return VM_FAULT_SIGBUS; - if (track_pfn_insert(vma, &pgprot, pfn)) - return VM_FAULT_SIGBUS; insert_pfn_pmd(vma, addr, pmd, pfn, pgprot, write); return VM_FAULT_NOPAGE; }
