linux-kernel - Re: [PATCH 1/2] drm/imagination: avoid -Wmissing-prototype warnings

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Date:   Wed, 29 Nov 2023 12:07:37 +0000
From:   Donald Robson <Donald.Robson@...tec.com>
To:     Frank Binns <Frank.Binns@...tec.com>,
        Matt Coster <Matt.Coster@...tec.com>,
        "arnd@...nel.org" <arnd@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tzimmermann@...e.de" <tzimmermann@...e.de>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "airlied@...il.com" <airlied@...il.com>,
        "dakr@...hat.com" <dakr@...hat.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "maarten.lankhorst@...ux.intel.com" 
        <maarten.lankhorst@...ux.intel.com>,
        Sarah Walker <Sarah.Walker@...tec.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "mripard@...nel.org" <mripard@...nel.org>,
        "boris.brezillon@...labora.com" <boris.brezillon@...labora.com>
Subject: Re: [PATCH 1/2] drm/imagination: avoid -Wmissing-prototype warnings

Hello Arnd,

Thanks for this.  However, I fixed these in a patch a few minutes before you sent
yours.  I'm not sure what normally happens in these circumstances, but as my patch has
the kernel robot tags and a few additional fixes, I think we should probably use that
one.

Thanks,
Donald

On Wed, 2023-11-29 at 12:33 +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> This warning option is now enabled by default, causing a few build regressions
> in combination with the newly added pvr driver:
> 
> drivers/gpu/drm/imagination/pvr_device.c:130:6: error: no previous prototype for 'pvr_device_process_active_queues' [-Werror=missing-prototypes]
>   130 | void pvr_device_process_active_queues(struct pvr_device *pvr_dev)
>       |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/gpu/drm/imagination/pvr_fw_meta.c:33:1: error: no previous prototype for 'pvr_meta_cr_read32' [-Werror=missing-prototypes]
>    33 | pvr_meta_cr_read32(struct pvr_device *pvr_dev, u32 reg_addr, u32 *reg_value_out)
>       | ^~~~~~~~~~~~~~~~~~
> drivers/gpu/drm/imagination/pvr_vm.c:542:6: error: no previous prototype for 'pvr_gpuvm_free' [-Werror=missing-prototypes]
>   542 | void pvr_gpuvm_free(struct drm_gpuvm *gpuvm)
> 
> Mark pvr_device_process_active_queues and pvr_gpuvm_free static as they are only used
> in the file they are defined in, and include the correct header for the pvr_meta_cr_read32
> declaration.
> 
> Fixes: eaf01ee5ba28 ("drm/imagination: Implement job submission and scheduling")
> Fixes: cc1aeedb98ad ("drm/imagination: Implement firmware infrastructure and META FW support")
> Fixes: ff5f643de0bf ("drm/imagination: Add GEM and VM related code")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/gpu/drm/imagination/pvr_device.c  | 2 +-
>  drivers/gpu/drm/imagination/pvr_fw_meta.c | 1 +
>  drivers/gpu/drm/imagination/pvr_vm.c      | 2 +-
>  3 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/imagination/pvr_device.c b/drivers/gpu/drm/imagination/pvr_device.c
> index 8499becf4fbb..048eba776cf2 100644
> --- a/drivers/gpu/drm/imagination/pvr_device.c
> +++ b/drivers/gpu/drm/imagination/pvr_device.c
> @@ -127,7 +127,7 @@ static int pvr_device_clk_init(struct pvr_device *pvr_dev)
>   * This is called any time we receive a FW event. It iterates over all
>   * active queues and calls pvr_queue_process() on them.
>   */
> -void pvr_device_process_active_queues(struct pvr_device *pvr_dev)
> +static void pvr_device_process_active_queues(struct pvr_device *pvr_dev)
>  {
>  	struct pvr_queue *queue, *tmp_queue;
>  	LIST_HEAD(active_queues);
> diff --git a/drivers/gpu/drm/imagination/pvr_fw_meta.c b/drivers/gpu/drm/imagination/pvr_fw_meta.c
> index 119934c36184..c39beb70c317 100644
> --- a/drivers/gpu/drm/imagination/pvr_fw_meta.c
> +++ b/drivers/gpu/drm/imagination/pvr_fw_meta.c
> @@ -4,6 +4,7 @@
>  #include "pvr_device.h"
>  #include "pvr_fw.h"
>  #include "pvr_fw_info.h"
> +#include "pvr_fw_meta.h"
>  #include "pvr_gem.h"
>  #include "pvr_rogue_cr_defs.h"
>  #include "pvr_rogue_meta.h"
> diff --git a/drivers/gpu/drm/imagination/pvr_vm.c b/drivers/gpu/drm/imagination/pvr_vm.c
> index 2aab53594a77..30ecd7d7052e 100644
> --- a/drivers/gpu/drm/imagination/pvr_vm.c
> +++ b/drivers/gpu/drm/imagination/pvr_vm.c
> @@ -539,7 +539,7 @@ pvr_device_addr_and_size_are_valid(struct pvr_vm_context *vm_ctx,
>  	       (device_addr + size <= PVR_PAGE_TABLE_ADDR_SPACE_SIZE);
>  }
>  
> -void pvr_gpuvm_free(struct drm_gpuvm *gpuvm)
> +static void pvr_gpuvm_free(struct drm_gpuvm *gpuvm)
>  {
>  	kfree(to_pvr_vm_context(gpuvm));
>  }