[Letux-kernel] LetuxOS: Kernel: m-latest 5.9-rc1 successful

[Andreas Kemnade]

On Tue, 18 Aug 2020 18:53:38 +0100
David Shah <dave at ds0.me> wrote:

> Trying out an LPAE build myself to see how it runs on the Pyra, I get a
> failure in the mxc fbdev driver:
> 
> drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c: In function
> ‘mxc_epdc_fb_fw_handler’:
> drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:5853:7: error: passing
> argument 3 of ‘dma_alloc_coherent’ from incompatible pointer type [-
> Werror=incompatible-pointer-types]
>  5853 |       &fb_data->waveform_buffer_phys,
>       |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>       |       |
>       |       u32 * {aka unsigned int *}
> In file included from drivers/video/fbdev/mxc/mxc_epdc_v2_fb.c:44:
> ./include/linux/dma-mapping.h:534:15: note: expected ‘dma_addr_t *’
> {aka ‘long long unsigned int *’} but argument is of type ‘u32 *’ {aka
> ‘unsigned int *’}
>   534 |   dma_addr_t *dma_handle, gfp_t gfp)
> 
> and several like this.
> 
> It seems like it assumes that dma_addr_t === u32 which isn't true for
> LPAE. 
> 
well, most places are using dma_addr_t, but a few are using u32.

> As I don't care about i.MX I will just disable the driver in my
> .config, but I think this is worth looking into if i.MX+LPAE is a
> supported config in letux.
> 
Well, at least it should be fixed if these things ever get upstreamed.
I have pushed fixes.

Regards,
Andreas