From a4d1a885251382250ec315482bdd8ca52dd61e6a Mon Sep 17 00:00:00 2001
From: Jérôme Glisse <jglisse@redhat.com>
Date: Thu, 31 Aug 2017 17:17:26 -0400
Subject: dax: update to new mmu_notifier semantic
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Replace all mmu_notifier_invalidate_page() calls by *_invalidate_range()
and make sure it is bracketed by calls to *_invalidate_range_start()/end().

Note that because we can not presume the pmd value or pte value we have
to assume the worst and unconditionaly report an invalidation as
happening.

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Bernhard Held <berny156@gmx.de>
Cc: Adam Borowski <kilobyte@angband.pl>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Wanpeng Li <kernellwp@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: axie <axie@amd.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/memory.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

(limited to 'mm')

diff --git a/mm/memory.c b/mm/memory.c
index fe2fba27ded2..56e48e4593cb 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4008,7 +4008,8 @@ int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
 #endif /* __PAGETABLE_PMD_FOLDED */
 
 static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address,
-		pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp)
+			    unsigned long *start, unsigned long *end,
+			    pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp)
 {
 	pgd_t *pgd;
 	p4d_t *p4d;
@@ -4035,17 +4036,29 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address,
 		if (!pmdpp)
 			goto out;
 
+		if (start && end) {
+			*start = address & PMD_MASK;
+			*end = *start + PMD_SIZE;
+			mmu_notifier_invalidate_range_start(mm, *start, *end);
+		}
 		*ptlp = pmd_lock(mm, pmd);
 		if (pmd_huge(*pmd)) {
 			*pmdpp = pmd;
 			return 0;
 		}
 		spin_unlock(*ptlp);
+		if (start && end)
+			mmu_notifier_invalidate_range_end(mm, *start, *end);
 	}
 
 	if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd)))
 		goto out;
 
+	if (start && end) {
+		*start = address & PAGE_MASK;
+		*end = *start + PAGE_SIZE;
+		mmu_notifier_invalidate_range_start(mm, *start, *end);
+	}
 	ptep = pte_offset_map_lock(mm, pmd, address, ptlp);
 	if (!pte_present(*ptep))
 		goto unlock;
@@ -4053,6 +4066,8 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address,
 	return 0;
 unlock:
 	pte_unmap_unlock(ptep, *ptlp);
+	if (start && end)
+		mmu_notifier_invalidate_range_end(mm, *start, *end);
 out:
 	return -EINVAL;
 }
@@ -4064,20 +4079,21 @@ static inline int follow_pte(struct mm_struct *mm, unsigned long address,
 
 	/* (void) is needed to make gcc happy */
 	(void) __cond_lock(*ptlp,
-			   !(res = __follow_pte_pmd(mm, address, ptepp, NULL,
-					   ptlp)));
+			   !(res = __follow_pte_pmd(mm, address, NULL, NULL,
+						    ptepp, NULL, ptlp)));
 	return res;
 }
 
 int follow_pte_pmd(struct mm_struct *mm, unsigned long address,
+			     unsigned long *start, unsigned long *end,
 			     pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp)
 {
 	int res;
 
 	/* (void) is needed to make gcc happy */
 	(void) __cond_lock(*ptlp,
-			   !(res = __follow_pte_pmd(mm, address, ptepp, pmdpp,
-					   ptlp)));
+			   !(res = __follow_pte_pmd(mm, address, start, end,
+						    ptepp, pmdpp, ptlp)));
 	return res;
 }
 EXPORT_SYMBOL(follow_pte_pmd);
-- 
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