x86: no CPA on iounmap

When an ioremap is unmapped, do not change the page attributes. There might
be another mapping of the same physical address. PAT might detect a conflicting
mapping attribute for no good reason. The mapping is removed anyway.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 4e21231..ee6648f 100644 (file)
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -240,9 +240,6 @@ void iounmap(volatile void __iomem *addr)
                return;
        }
 
-       /* Reset the direct mapping. Can block */
-       ioremap_change_attr(p->phys_addr, p->size, IOR_MODE_CACHED);
-
        /* Finally remove it */
        o = remove_vm_area((void *)addr);
        BUG_ON(p != o || o == NULL);