Le 29/09/2015 01:41, Scott Wood a écrit :

On Tue, Sep 22, 2015 at 06:50:40PM +0200, Christophe Leroy wrote:

quoted

iounmap() cannot vunmap() area mapped by TLBCAMs either

Signed-off-by: Christophe Leroy <redacted>
---
No change in v2

  arch/powerpc/mm/pgtable_32.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 7692d1b..03a073a 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c

@@ -278,7 +278,9 @@ void iounmap(volatile void __iomem *addr)
  	 * If mapped by BATs then there is nothing to do.
  	 * Calling vfree() generates a benign warning.
  	 */
-	if (v_mapped_by_bats((unsigned long)addr)) return;
+	if (v_mapped_by_bats((unsigned long)addr) ||
+	    v_mapped_by_tlbcam((unsigned long)addr))
+		return;

This is pretty pointless given that the next patch replaces both with
v_mapped_by_other().

I thought it was cleaner to first fix the bug, in order to make the 
following patch straight through, but I can skip it, no problem.

Christophe