s390/mm: use _SEGMENT_ENTRY_EMPTY in the code

_SEGMENT_ENTRY_INVALID denotes the invalid bit in a segment table
entry whereas _SEGMENT_ENTRY_EMPTY means that the value of the whole
entry is only the invalid bit, as the entry is completely empty.

Therefore we use _SEGMENT_ENTRY_INVALID only to check and set the
invalid bit with bitwise operations. _SEGMENT_ENTRY_EMPTY is only used
to check for (un)equality.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 5251186..7ed1972 100644 (file)
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -640,12 +640,12 @@ static inline int pud_bad(pud_t pud)
 
 static inline int pmd_present(pmd_t pmd)
 {
-       return pmd_val(pmd) != _SEGMENT_ENTRY_INVALID;
+       return pmd_val(pmd) != _SEGMENT_ENTRY_EMPTY;
 }
 
 static inline int pmd_none(pmd_t pmd)
 {
-       return pmd_val(pmd) == _SEGMENT_ENTRY_INVALID;
+       return pmd_val(pmd) == _SEGMENT_ENTRY_EMPTY;
 }
 
 static inline unsigned long pmd_pfn(pmd_t pmd)
@@ -803,7 +803,7 @@ static inline void pud_clear(pud_t *pud)
 
 static inline void pmd_clear(pmd_t *pmdp)
 {
-       pmd_val(*pmdp) = _SEGMENT_ENTRY_INVALID;
+       pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY;
 }
 
 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
@@ -1357,7 +1357,7 @@ static inline pmd_t pmd_mkhuge(pmd_t pmd)
 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
                                            unsigned long addr, pmd_t *pmdp)
 {
-       return pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_INVALID));
+       return pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
 }
 
 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL
@@ -1367,10 +1367,10 @@ static inline pmd_t pmdp_huge_get_and_clear_full(struct mm_struct *mm,
 {
        if (full) {
                pmd_t pmd = *pmdp;
-               *pmdp = __pmd(_SEGMENT_ENTRY_INVALID);
+               *pmdp = __pmd(_SEGMENT_ENTRY_EMPTY);
                return pmd;
        }
-       return pmdp_xchg_lazy(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_INVALID));
+       return pmdp_xchg_lazy(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
 }
 
 #define __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
@@ -1384,7 +1384,7 @@ static inline pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
 static inline void pmdp_invalidate(struct vm_area_struct *vma,
                                   unsigned long addr, pmd_t *pmdp)
 {
-       pmdp_xchg_direct(vma->vm_mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_INVALID));
+       pmdp_xchg_direct(vma->vm_mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
 }
 
 #define __HAVE_ARCH_PMDP_SET_WRPROTECT

diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index 59ac937..a07b1ec 100644 (file)
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -359,8 +359,8 @@ static int __gmap_unlink_by_vmaddr(struct gmap *gmap, unsigned long vmaddr)
        spin_lock(&gmap->guest_table_lock);
        entry = radix_tree_delete(&gmap->host_to_guest, vmaddr >> PMD_SHIFT);
        if (entry) {
-               flush = (*entry != _SEGMENT_ENTRY_INVALID);
-               *entry = _SEGMENT_ENTRY_INVALID;
+               flush = (*entry != _SEGMENT_ENTRY_EMPTY);
+               *entry = _SEGMENT_ENTRY_EMPTY;
        }
        spin_unlock(&gmap->guest_table_lock);
        return flush;
@@ -589,7 +589,7 @@ int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr)
                return rc;
        ptl = pmd_lock(mm, pmd);
        spin_lock(&gmap->guest_table_lock);
-       if (*table == _SEGMENT_ENTRY_INVALID) {
+       if (*table == _SEGMENT_ENTRY_EMPTY) {
                rc = radix_tree_insert(&gmap->host_to_guest,
                                       vmaddr >> PMD_SHIFT, table);
                if (!rc)

diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index a038162..9b4050c 100644 (file)
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -62,7 +62,7 @@ static inline unsigned long __pte_to_rste(pte_t pte)
                rste |= move_set_bit(pte_val(pte), _PAGE_NOEXEC,
                                     _SEGMENT_ENTRY_NOEXEC);
        } else
-               rste = _SEGMENT_ENTRY_INVALID;
+               rste = _SEGMENT_ENTRY_EMPTY;
        return rste;
 }