powerpc/mm: properly set PAGE_KERNEL flags in ioremap()

Set PAGE_KERNEL directly in the caller and do not rely on a
hack adding PAGE_KERNEL flags when _PAGE_PRESENT is not set.

As already done for PPC64, use pgprot_cache() helpers instead of
_PAGE_XXX flags in PPC32 ioremap() derived functions.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 12 insertions, 16 deletions

diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 4c3adde09d95..6a81a2446c47 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -76,32 +76,36 @@ pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
 void __iomem *
 ioremap(phys_addr_t addr, unsigned long size)
 {
-	return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED,
-				__builtin_return_address(0));
+	unsigned long flags = pgprot_val(pgprot_noncached(PAGE_KERNEL));
+
+	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
 }
 EXPORT_SYMBOL(ioremap);
 
 void __iomem *
 ioremap_wc(phys_addr_t addr, unsigned long size)
 {
-	return __ioremap_caller(addr, size, _PAGE_NO_CACHE,
-				__builtin_return_address(0));
+	unsigned long flags = pgprot_val(pgprot_noncached_wc(PAGE_KERNEL));
+
+	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
 }
 EXPORT_SYMBOL(ioremap_wc);
 
 void __iomem *
 ioremap_wt(phys_addr_t addr, unsigned long size)
 {
-	return __ioremap_caller(addr, size, _PAGE_WRITETHRU,
-				__builtin_return_address(0));
+	unsigned long flags = pgprot_val(pgprot_cached_wthru(PAGE_KERNEL));
+
+	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
 }
 EXPORT_SYMBOL(ioremap_wt);
 
 void __iomem *
 ioremap_coherent(phys_addr_t addr, unsigned long size)
 {
-	return __ioremap_caller(addr, size, _PAGE_COHERENT,
-				__builtin_return_address(0));
+	unsigned long flags = pgprot_val(pgprot_cached(PAGE_KERNEL));
+
+	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
 }
 EXPORT_SYMBOL(ioremap_coherent);
 
@@ -134,14 +138,6 @@ __ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
 	phys_addr_t p;
 	int err;
 
-	/* Make sure we have the base flags */
-	if ((flags & _PAGE_PRESENT) == 0)
-		flags |= pgprot_val(PAGE_KERNEL);
-
-	/* Non-cacheable page cannot be coherent */
-	if (flags & _PAGE_NO_CACHE)
-		flags &= ~_PAGE_COHERENT;
-
 	/*
 	 * Choose an address to map it to.
 	 * Once the vmalloc system is running, we use it.