From ebd31197931d75c837269f3fd3365b4cee358faf Mon Sep 17 00:00:00 2001 From: Oliver O'Halloran Date: Wed, 28 Jun 2017 11:32:34 +1000 Subject: powerpc/mm: Add devmap support for ppc64 Add support for the devmap bit on PTEs and PMDs for PPC64 Book3S. This is used to differentiate device backed memory from transparent huge pages since they are handled in more or less the same manner by the core mm code. Cc: Aneesh Kumar K.V Signed-off-by: Oliver O'Halloran Signed-off-by: Michael Ellerman --- arch/powerpc/mm/pgtable-radix.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/powerpc/mm/pgtable-radix.c') diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c index 419199d..f6af903 100644 --- a/arch/powerpc/mm/pgtable-radix.c +++ b/arch/powerpc/mm/pgtable-radix.c @@ -696,7 +696,7 @@ unsigned long radix__pmd_hugepage_update(struct mm_struct *mm, unsigned long add unsigned long old; #ifdef CONFIG_DEBUG_VM - WARN_ON(!radix__pmd_trans_huge(*pmdp)); + WARN_ON(!radix__pmd_trans_huge(*pmdp) && !pmd_devmap(*pmdp)); assert_spin_locked(&mm->page_table_lock); #endif @@ -714,6 +714,7 @@ pmd_t radix__pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long addre VM_BUG_ON(address & ~HPAGE_PMD_MASK); VM_BUG_ON(radix__pmd_trans_huge(*pmdp)); + VM_BUG_ON(pmd_devmap(*pmdp)); /* * khugepaged calls this for normal pmd */ -- cgit v1.1