[SPARC]: Respect vm_page_prot in io_remap_page_range().

Make sure the callers do a pgprot_noncached() on
vma->vm_page_prot.

Pointed out by Hugh Dickens.

Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 20 insertions, 7 deletions

diff --git a/arch/sparc/mm/generic.c b/arch/sparc/mm/generic.c
index 2cb0728cee05..1ef7fa03fefe 100644
--- a/arch/sparc/mm/generic.c
+++ b/arch/sparc/mm/generic.c
@@ -76,7 +76,6 @@ int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
         vma->vm_pgoff = (offset >> PAGE_SHIFT) |
                 ((unsigned long)space << 28UL);
 
-        prot = __pgprot(pg_iobits);
         offset -= from;
         dir = pgd_offset(mm, from);
         flush_cache_range(vma, beg, end);
diff --git a/arch/sparc/mm/loadmmu.c b/arch/sparc/mm/loadmmu.c
index e9f9571601ba..36b4d24988f8 100644
--- a/arch/sparc/mm/loadmmu.c
+++ b/arch/sparc/mm/loadmmu.c
@@ -22,8 +22,6 @@ struct ctx_list *ctx_list_pool;
 struct ctx_list ctx_free;
 struct ctx_list ctx_used;
 
-unsigned int pg_iobits;
-
 extern void ld_mmu_sun4c(void);
 extern void ld_mmu_srmmu(void);
 
diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index c664b962987c..27b0e0ba8581 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -2130,6 +2130,13 @@ static unsigned long srmmu_pte_to_pgoff(pte_t pte)
         return pte_val(pte) >> SRMMU_PTE_FILE_SHIFT;
 }
 
+static pgprot_t srmmu_pgprot_noncached(pgprot_t prot)
+{
+        prot &= ~__pgprot(SRMMU_CACHE);
+
+        return prot;
+}
+
 /* Load up routines and constants for sun4m and sun4d mmu */
 void __init ld_mmu_srmmu(void)
 {
@@ -2150,9 +2157,9 @@ void __init ld_mmu_srmmu(void)
         BTFIXUPSET_INT(page_readonly, pgprot_val(SRMMU_PAGE_RDONLY));
         BTFIXUPSET_INT(page_kernel, pgprot_val(SRMMU_PAGE_KERNEL));
         page_kernel = pgprot_val(SRMMU_PAGE_KERNEL);
-        pg_iobits = SRMMU_VALID | SRMMU_WRITE | SRMMU_REF;
 
         /* Functions */
+        BTFIXUPSET_CALL(pgprot_noncached, srmmu_pgprot_noncached, BTFIXUPCALL_NORM);
 #ifndef CONFIG_SMP      
         BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4md, BTFIXUPCALL_SWAPG1G2);
 #endif
diff --git a/arch/sparc/mm/sun4c.c b/arch/sparc/mm/sun4c.c
index 731f19603cad..49f28c1bdc6d 100644
--- a/arch/sparc/mm/sun4c.c
+++ b/arch/sparc/mm/sun4c.c
@@ -1589,7 +1589,10 @@ static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
 
 static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr)
 {
-        unsigned long page_entry;
+        unsigned long page_entry, pg_iobits;
+
+        pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
+                    _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
 
         page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK);
         page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT));
@@ -2134,6 +2137,13 @@ void __init sun4c_paging_init(void)
         printk("SUN4C: %d mmu entries for the kernel\n", cnt);
 }
 
+static pgprot_t sun4c_pgprot_noncached(pgprot_t prot)
+{
+        prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE);
+
+        return prot;
+}
+
 /* Load up routines and constants for sun4c mmu */
 void __init ld_mmu_sun4c(void)
 {
@@ -2156,10 +2166,9 @@ void __init ld_mmu_sun4c(void)
         BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
         BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
         page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
-        pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
-                    _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
 
         /* Functions */
+        BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM);
         BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
         BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);