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

From: Scott Wood
Date: Mon Sep 28 2015 - 19:41:33 EST


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 <christophe.leroy@xxxxxx>
> ---
> 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
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