On Sat, Aug 29, 2020 at 02:45:38PM +0200, Luc Van Oostenryck wrote:
> For ppc32, the functions fsl_ioread64() & fsl_ioread64be()
> use lower_32_bits() as a fancy way to cast the pointer to u32
> in order to do non-atomic 64-bit IO.
>
> But the pointer is already 32-bit, so simply cast the pointer to u32.
>
> This fixes a compile error introduced by
> ef91bb196b0d ("kernel.h: Silence sparse warning in lower_32_bits")
>
> Fixes: ef91bb196b0db1013ef8705367bc2d7944ef696b
checkpatch complains about this and prefers
Fixes: ef91bb196b0d ("kernel.h: Silence sparse warning in lower_32_bits")
Otherwise
Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> Cc: Li Yang <leoyang.li@xxxxxxx>
> Cc: Zhang Wei <zw@xxxxxxxxxxxxx>
> Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> Cc: Vinod Koul <vkoul@xxxxxxxxxx>
> Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
> Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
> Cc: dmaengine@xxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
> ---
> drivers/dma/fsldma.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h
> index 56f18ae99233..6f6fa7641fa2 100644
> --- a/drivers/dma/fsldma.h
> +++ b/drivers/dma/fsldma.h
> @@ -205,7 +205,7 @@ struct fsldma_chan {
> #else
> static u64 fsl_ioread64(const u64 __iomem *addr)
> {
> - u32 fsl_addr = lower_32_bits(addr);
> + u32 fsl_addr = (u32) addr;
> u64 fsl_addr_hi = (u64)in_le32((u32 *)(fsl_addr + 1)) << 32;
>
> return fsl_addr_hi | in_le32((u32 *)fsl_addr);
> @@ -219,7 +219,7 @@ static void fsl_iowrite64(u64 val, u64 __iomem *addr)
>
> static u64 fsl_ioread64be(const u64 __iomem *addr)
> {
> - u32 fsl_addr = lower_32_bits(addr);
> + u32 fsl_addr = (u32) addr;
> u64 fsl_addr_hi = (u64)in_be32((u32 *)fsl_addr) << 32;
>
> return fsl_addr_hi | in_be32((u32 *)(fsl_addr + 1));
> --
> 2.28.0
>
