linux-kernel - Re: [PATCH v3] drm/panfrost: fix -Wmissing-prototypes warnings

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Message-ID: <31dc2f01-299c-6a52-4111-3e60e555cb9b@arm.com>
Date:   Fri, 25 Oct 2019 10:10:12 +0100
From:   Steven Price <steven.price@....com>
To:     Yi Wang <wang.yi59@....com.cn>, robh@...nel.org
Cc:     tomeu.vizoso@...labora.com, airlied@...ux.ie,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        wang.liang82@....com.cn, xue.zhihong@....com.cn, up2wing@...il.com
Subject: Re: [PATCH v3] drm/panfrost: fix -Wmissing-prototypes warnings

On 25/10/2019 02:30, Yi Wang wrote:
> We get these warnings when build kernel W=1:
> drivers/gpu/drm/panfrost/panfrost_perfcnt.c:35:6: warning: no previous prototype for ‘panfrost_perfcnt_clean_cache_done’ [-Wmissing-prototypes]
> drivers/gpu/drm/panfrost/panfrost_perfcnt.c:40:6: warning: no previous prototype for ‘panfrost_perfcnt_sample_done’ [-Wmissing-prototypes]
> drivers/gpu/drm/panfrost/panfrost_perfcnt.c:190:5: warning: no previous prototype for ‘panfrost_ioctl_perfcnt_enable’ [-Wmissing-prototypes]
> drivers/gpu/drm/panfrost/panfrost_perfcnt.c:218:5: warning: no previous prototype for ‘panfrost_ioctl_perfcnt_dump’ [-Wmissing-prototypes]
> drivers/gpu/drm/panfrost/panfrost_perfcnt.c:250:6: warning: no previous prototype for ‘panfrost_perfcnt_close’ [-Wmissing-prototypes]
> drivers/gpu/drm/panfrost/panfrost_perfcnt.c:264:5: warning: no previous prototype for ‘panfrost_perfcnt_init’ [-Wmissing-prototypes]
> drivers/gpu/drm/panfrost/panfrost_perfcnt.c:320:6: warning: no previous prototype for ‘panfrost_perfcnt_fini’ [-Wmissing-prototypes]
> drivers/gpu/drm/panfrost/panfrost_mmu.c:227:6: warning: no previous prototype for ‘panfrost_mmu_flush_range’ [-Wmissing-prototypes]
> drivers/gpu/drm/panfrost/panfrost_mmu.c:435:5: warning: no previous prototype for ‘panfrost_mmu_map_fault_addr’ [-Wmissing-prototypes]
> 
> For file panfrost_mmu.c, make functions static to fix this.
> For file panfrost_perfcnt.c, include header file can fix this.
> 
> Signed-off-by: Yi Wang <wang.yi59@....com.cn>
> Reviewed-by: Steven Price <steven.price@....com>
> ---
> 
> v3: using tab size of 8 other than 4.
> 
> v2: align parameter line and modify comment. Thanks to Steve.
> ---
>  drivers/gpu/drm/panfrost/panfrost_mmu.c     | 9 +++++----
>  drivers/gpu/drm/panfrost/panfrost_perfcnt.c | 1 +
>  2 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> index bdd9905..871574c 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> @@ -224,9 +224,9 @@ static size_t get_pgsize(u64 addr, size_t size)
>  	return SZ_2M;
>  }
>  
> -void panfrost_mmu_flush_range(struct panfrost_device *pfdev,
> -			      struct panfrost_mmu *mmu,
> -			      u64 iova, size_t size)
> +static void panfrost_mmu_flush_range(struct panfrost_device *pfdev,
> +				    struct panfrost_mmu *mmu,
> +				    u64 iova, size_t size)

Ok, I'll admit I wouldn't have spotted this unless I'd double checked by
applying the patch, but you still seem to have something misconfigured
in your editor. This is out by one character:

static void panfrost_mmu_flush_range(struct panfrost_device *pfdev,
>------->------->------->-------    struct panfrost_mmu *mmu,
>------->------->------->-------    u64 iova, size_t size)

There should be an extra space to align correctly.

>  {
>  	if (mmu->as < 0)
>  		return;
> @@ -432,7 +432,8 @@ void panfrost_mmu_pgtable_free(struct panfrost_file_priv *priv)
>  
>  #define NUM_FAULT_PAGES (SZ_2M / PAGE_SIZE)
>  
> -int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as, u64 addr)
> +static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as,
> +					u64 addr)

Here you're off-by-one in the other direction - you need to replace the
final tab with 7 spaces:

static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as,
>------->------->------->------->-------u64 addr)

Sorry to nit-pick over this, but it's good to get your editor setup
correctly to ensure your formatting is correct.

Thanks,

Steve

>  {
>  	int ret, i;
>  	struct panfrost_gem_object *bo;
> diff --git a/drivers/gpu/drm/panfrost/panfrost_perfcnt.c b/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
> index 83c57d3..2dba192 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_perfcnt.c
> @@ -16,6 +16,7 @@
>  #include "panfrost_issues.h"
>  #include "panfrost_job.h"
>  #include "panfrost_mmu.h"
> +#include "panfrost_perfcnt.h"
>  #include "panfrost_regs.h"
>  
>  #define COUNTERS_PER_BLOCK		64
>