Subject: Re: [PATCH v2 06/25] powerpc32: iounmap() cannot vunmap() area mapped by TLBCAMs either

From: Scott Wood <[email-masked]>
Date: Mon, 28 Sep 2015 18:41:16 -0500

On Tue, Sep 22, 2015 at 06:50:40PM +0200, Christophe Leroy wrote:
> iounmap() cannot vunmap() area mapped by TLBCAMs either
> 
> Signed-off-by: Christophe Leroy <[email-masked]>
> ---
> 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().

-Scott