mm: update ptep_modify_prot_commit to take old pte value as arg

Architectures like ppc64 require to do a conditional tlb flush based on
the old and new value of pte.  Enable that by passing old pte value as
the arg.

Link: http://lkml.kernel.org/r/20190116085035.29729-3-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 5d73019..76dc344 100644 (file)
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1070,7 +1070,8 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
 
 #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
 pte_t ptep_modify_prot_start(struct vm_area_struct *, unsigned long, pte_t *);
-void ptep_modify_prot_commit(struct vm_area_struct *, unsigned long, pte_t *, pte_t);
+void ptep_modify_prot_commit(struct vm_area_struct *, unsigned long,
+                            pte_t *, pte_t, pte_t);
 
 #define __HAVE_ARCH_PTEP_CLEAR_FLUSH
 static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,

diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 71aa011..8485d6d 100644 (file)
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -321,7 +321,7 @@ pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr,
 }
 
 void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr,
-                            pte_t *ptep, pte_t pte)
+                            pte_t *ptep, pte_t old_pte, pte_t pte)
 {
        pgste_t pgste;
        struct mm_struct *mm = vma->vm_mm;

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index c5a7f18..c25c38a 100644 (file)
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -433,7 +433,7 @@ static inline pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned
 }
 
 static inline void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr,
-                                          pte_t *ptep, pte_t pte)
+                                          pte_t *ptep, pte_t old_pte, pte_t pte)
 {
 
        if (sizeof(pteval_t) > sizeof(long))

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 9c2ef73..beccb0b 100644 (file)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -948,10 +948,12 @@ static inline void clear_soft_dirty(struct vm_area_struct *vma,
        pte_t ptent = *pte;
 
        if (pte_present(ptent)) {
-               ptent = ptep_modify_prot_start(vma, addr, pte);
-               ptent = pte_wrprotect(ptent);
+               pte_t old_pte;
+
+               old_pte = ptep_modify_prot_start(vma, addr, pte);
+               ptent = pte_wrprotect(old_pte);
                ptent = pte_clear_soft_dirty(ptent);
-               ptep_modify_prot_commit(vma, addr, pte, ptent);
+               ptep_modify_prot_commit(vma, addr, pte, old_pte, ptent);
        } else if (is_swap_pte(ptent)) {
                ptent = pte_swp_clear_soft_dirty(ptent);
                set_pte_at(vma->vm_mm, addr, pte, ptent);

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 8b0e933..fa782fb 100644 (file)
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -657,7 +657,7 @@ static inline pte_t ptep_modify_prot_start(struct vm_area_struct *vma,
  */
 static inline void ptep_modify_prot_commit(struct vm_area_struct *vma,
                                           unsigned long addr,
-                                          pte_t *ptep, pte_t pte)
+                                          pte_t *ptep, pte_t old_pte, pte_t pte)
 {
        __ptep_modify_prot_commit(vma, addr, ptep, pte);
 }

diff --git a/mm/memory.c b/mm/memory.c
index 5ade525..557c6ff 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3599,7 +3599,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
        int last_cpupid;
        int target_nid;
        bool migrated = false;
-       pte_t pte;
+       pte_t pte, old_pte;
        bool was_writable = pte_savedwrite(vmf->orig_pte);
        int flags = 0;
 
@@ -3619,12 +3619,12 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
         * Make it present again, Depending on how arch implementes non
         * accessible ptes, some can allow access by kernel mode.
         */
-       pte = ptep_modify_prot_start(vma, vmf->address, vmf->pte);
-       pte = pte_modify(pte, vma->vm_page_prot);
+       old_pte = ptep_modify_prot_start(vma, vmf->address, vmf->pte);
+       pte = pte_modify(old_pte, vma->vm_page_prot);
        pte = pte_mkyoung(pte);
        if (was_writable)
                pte = pte_mkwrite(pte);
-       ptep_modify_prot_commit(vma, vmf->address, vmf->pte, pte);
+       ptep_modify_prot_commit(vma, vmf->address, vmf->pte, old_pte, pte);
        update_mmu_cache(vma, vmf->address, vmf->pte);
 
        page = vm_normal_page(vma, vmf->address, pte);

diff --git a/mm/mprotect.c b/mm/mprotect.c
index c89ce07..028c724 100644 (file)
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -110,8 +110,8 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
                                        continue;
                        }
 
-                       ptent = ptep_modify_prot_start(vma, addr, pte);
-                       ptent = pte_modify(ptent, newprot);
+                       oldpte = ptep_modify_prot_start(vma, addr, pte);
+                       ptent = pte_modify(oldpte, newprot);
                        if (preserve_write)
                                ptent = pte_mk_savedwrite(ptent);
 
@@ -121,7 +121,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
                                         !(vma->vm_flags & VM_SOFTDIRTY))) {
                                ptent = pte_mkwrite(ptent);
                        }
-                       ptep_modify_prot_commit(vma, addr, pte, ptent);
+                       ptep_modify_prot_commit(vma, addr, pte, oldpte, ptent);
                        pages++;
                } else if (IS_ENABLED(CONFIG_MIGRATION)) {
                        swp_entry_t entry = pte_to_swp_entry(oldpte);