Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney...

[pandora-kernel.git] / arch / powerpc / mm / pgtable_64.c

diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 3ef0ad2..365e61a 100644 (file)
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -107,9 +107,18 @@ void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size,
 {
        unsigned long i;
 
+       /* 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;
+
+       /* We don't support the 4K PFN hack with ioremap */
+       if (flags & _PAGE_4K_PFN)
+               return NULL;
+
        WARN_ON(pa & ~PAGE_MASK);
        WARN_ON(((unsigned long)ea) & ~PAGE_MASK);
        WARN_ON(size & ~PAGE_MASK);
@@ -190,6 +199,13 @@ void __iomem * ioremap(phys_addr_t addr, unsigned long size)
 void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size,
                             unsigned long flags)
 {
+       /* writeable implies dirty for kernel addresses */
+       if (flags & _PAGE_RW)
+               flags |= _PAGE_DIRTY;
+
+       /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
+       flags &= ~(_PAGE_USER | _PAGE_EXEC);
+
        if (ppc_md.ioremap)
                return ppc_md.ioremap(addr, size, flags);
        return __ioremap(addr, size, flags);