Subject: [RFC PATCH V1 20/33] powerpc/mm: Use flush_tlb_page in ptep_clear_flush_young

From: "Aneesh Kumar K.V" <[email-masked]>
Date: Tue, 12 Jan 2016 12:45:55 +0530

This should not have any impact for hash linux implementation. But radix
would require us to flush tlb after clearing accessed bit. Also move
code that is not dependent on pte bits to generic header.

Signed-off-by: Aneesh Kumar K.V <[email-masked]>
---
 arch/powerpc/include/asm/book3s/64/hash.h    | 45 +++++-----------------------
 arch/powerpc/include/asm/book3s/64/pgtable.h | 38 +++++++++++++++++++++++
 arch/powerpc/include/asm/mmu-hash64.h        |  2 +-
 3 files changed, 47 insertions(+), 38 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h
index 212037f5c0af..f6d27579607f 100644
--- a/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/arch/powerpc/include/asm/book3s/64/hash.h
@@ -305,6 +305,14 @@ static inline unsigned long pte_update(struct mm_struct *mm,
 	return old;
 }
 
+/*
+ * We currently remove entries from the hashtable regardless of whether
+ * the entry was young or dirty. The generic routines only flush if the
+ * entry was young or dirty which is not good enough.
+ *
+ * We should be more intelligent about this but for the moment we override
+ * these functions and force a tlb flush unconditionally
+ */
 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
 					      unsigned long addr, pte_t *ptep)
 {
@@ -315,13 +323,6 @@ static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
 	old = pte_update(mm, addr, ptep, H_PAGE_ACCESSED, 0, 0);
 	return (old & H_PAGE_ACCESSED) != 0;
 }
-#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
-#define ptep_test_and_clear_young(__vma, __addr, __ptep)		   \
-({									   \
-	int __r;							   \
-	__r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
-	__r;								   \
-})
 
 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
@@ -343,36 +344,6 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
 	pte_update(mm, addr, ptep, H_PAGE_RW, 0, 1);
 }
 
-/*
- * We currently remove entries from the hashtable regardless of whether
- * the entry was young or dirty. The generic routines only flush if the
- * entry was young or dirty which is not good enough.
- *
- * We should be more intelligent about this but for the moment we override
- * these functions and force a tlb flush unconditionally
- */
-#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
-#define ptep_clear_flush_young(__vma, __address, __ptep)		\
-({									\
-	int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
-						  __ptep);		\
-	__young;							\
-})
-
-#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
-static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
-				       unsigned long addr, pte_t *ptep)
-{
-	unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
-	return __pte(old);
-}
-
-static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
-			     pte_t * ptep)
-{
-	pte_update(mm, addr, ptep, ~0UL, 0, 0);
-}
-
 
 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
  * function doesn't need to flush the hash entry
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 3df6684c5948..90ec5b8b02c1 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -8,6 +8,10 @@
 #include <asm/book3s/64/hash.h>
 #include <asm/barrier.h>
 
+#ifndef __ASSEMBLY__
+#include <asm/tlbflush.h>
+#include <linux/mm_types.h>
+#endif
 /*
  * The second half of the kernel virtual space is used for IO mappings,
  * it's itself carved into the PIO region (ISA and PHB IO space) and
@@ -126,6 +130,40 @@ extern unsigned long ioremap_bot;
 
 #endif /* __real_pte */
 
+#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
+static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
+					    unsigned long address,
+					    pte_t *ptep)
+{
+	return  __ptep_test_and_clear_young(vma->vm_mm, address, ptep);
+}
+
+#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
+static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
+					 unsigned long address, pte_t *ptep)
+{
+	int young;
+
+	young = __ptep_test_and_clear_young(vma->vm_mm, address, ptep);
+	if (young)
+		flush_tlb_page(vma, address);
+	return young;
+}
+
+#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
+static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
+				       unsigned long addr, pte_t *ptep)
+{
+	unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
+	return __pte(old);
+}
+
+static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
+			     pte_t * ptep)
+{
+	pte_update(mm, addr, ptep, ~0UL, 0, 0);
+}
+
 static inline void pmd_set(pmd_t *pmdp, unsigned long val)
 {
 	*pmdp = __pmd(val);
diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h
index c3b77a1cf1a0..95ee27564804 100644
--- a/arch/powerpc/include/asm/mmu-hash64.h
+++ b/arch/powerpc/include/asm/mmu-hash64.h
@@ -21,7 +21,7 @@
  * need for various slices related matters. Note that this isn't the
  * complete pgtable.h but only a portion of it.
  */
-#include <asm/book3s/64/pgtable.h>
+#include <asm/book3s/64/hash.h>
 #include <asm/bug.h>
 #include <asm/processor.h>
 
-- 
2.5.0