s390/mm,pageattr: don't use pte_val()/pXd_val() as lvalue

Convert pgtable code so pte_val()/pXd_val() aren't used as lvalue
anymore. This allows in later step to convert pte_val()/pXd_val() to
functions, which in turn makes it impossible to use these macros to
modify page table entries like they have been used before.

Therefore a construct like this:

        pte_val(*pte) = __pa(addr) | prot;

which would directly write into a page table, isn't possible anymore
with the last step of this series.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c
index 2959bfa..85195c1 100644 (file)
--- a/arch/s390/mm/pageattr.c
+++ b/arch/s390/mm/pageattr.c
@@ -98,9 +98,9 @@ static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
                else if (flags & SET_MEMORY_RW)
                        new = pte_mkwrite(pte_mkdirty(new));
                if (flags & SET_MEMORY_NX)
-                       pte_val(new) |= _PAGE_NOEXEC;
+                       new = set_pte_bit(new, __pgprot(_PAGE_NOEXEC));
                else if (flags & SET_MEMORY_X)
-                       pte_val(new) &= ~_PAGE_NOEXEC;
+                       new = clear_pte_bit(new, __pgprot(_PAGE_NOEXEC));
                pgt_set((unsigned long *)ptep, pte_val(new), addr, CRDTE_DTT_PAGE);
                ptep++;
                addr += PAGE_SIZE;
@@ -131,7 +131,7 @@ static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
                pte_addr += PAGE_SIZE;
                ptep++;
        }
-       pmd_val(new) = __pa(pt_dir) | _SEGMENT_ENTRY;
+       new = __pmd(__pa(pt_dir) | _SEGMENT_ENTRY);
        pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
        update_page_count(PG_DIRECT_MAP_4K, PTRS_PER_PTE);
        update_page_count(PG_DIRECT_MAP_1M, -1);
@@ -148,9 +148,9 @@ static void modify_pmd_page(pmd_t *pmdp, unsigned long addr,
        else if (flags & SET_MEMORY_RW)
                new = pmd_mkwrite(pmd_mkdirty(new));
        if (flags & SET_MEMORY_NX)
-               pmd_val(new) |= _SEGMENT_ENTRY_NOEXEC;
+               new = set_pmd_bit(new, __pgprot(_SEGMENT_ENTRY_NOEXEC));
        else if (flags & SET_MEMORY_X)
-               pmd_val(new) &= ~_SEGMENT_ENTRY_NOEXEC;
+               new = clear_pmd_bit(new, __pgprot(_SEGMENT_ENTRY_NOEXEC));
        pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
 }
 
@@ -212,7 +212,7 @@ static int split_pud_page(pud_t *pudp, unsigned long addr)
                pmd_addr += PMD_SIZE;
                pmdp++;
        }
-       pud_val(new) = __pa(pm_dir) | _REGION3_ENTRY;
+       new = __pud(__pa(pm_dir) | _REGION3_ENTRY);
        pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
        update_page_count(PG_DIRECT_MAP_1M, PTRS_PER_PMD);
        update_page_count(PG_DIRECT_MAP_2G, -1);
@@ -229,9 +229,9 @@ static void modify_pud_page(pud_t *pudp, unsigned long addr,
        else if (flags & SET_MEMORY_RW)
                new = pud_mkwrite(pud_mkdirty(new));
        if (flags & SET_MEMORY_NX)
-               pud_val(new) |= _REGION_ENTRY_NOEXEC;
+               new = set_pud_bit(new, __pgprot(_REGION_ENTRY_NOEXEC));
        else if (flags & SET_MEMORY_X)
-               pud_val(new) &= ~_REGION_ENTRY_NOEXEC;
+               new = clear_pud_bit(new, __pgprot(_REGION_ENTRY_NOEXEC));
        pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
 }