On Tue, Sep 06, 2016 at 02:59:41PM +0200, Arnd Bergmann wrote:
> casting between dma_addr_t and a pointer is generally tricky,
> as they might not be the same size and almost never point into
> the same address space. With 32-bit ARM systems and LPAE, we
> get this warning for the vme_fake driver that stores a pointer
> in a dma_addr_t variable:
>
> drivers/vme/bridges/vme_fake.c: In function 'fake_slave_set':
> drivers/vme/bridges/vme_fake.c:204:29: error: assignment makes pointer from integer without a cast [-Werror=int-conversion]
>
> To make this clearer while fixing the warning, I'm adding
> a set of helper functions for the type conversion.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> drivers/vme/bridges/vme_fake.c | 26 ++++++++++++++++++--------
> 1 file changed, 18 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/vme/bridges/vme_fake.c b/drivers/vme/bridges/vme_fake.c
> index 7ef298b289f4..ebf35d305321 100644
> --- a/drivers/vme/bridges/vme_fake.c
> +++ b/drivers/vme/bridges/vme_fake.c
> @@ -48,7 +48,7 @@ struct fake_slave_window {
> int enabled;
> unsigned long long vme_base;
> unsigned long long size;
> - dma_addr_t buf_base;
> + void *buf_base;
This shouldn't be u64? (I don't know the answer).
regards,
dan carpenter
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