Re: [Intel-gfx] [PATCH][next] drm/i915/pmu: fix sizeof on attr, should be *attr

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

Hi,

On 12/01/2018 17:36, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
> 
> I believe the sizeof(attr) should be in fact sizeof(*attr), fortunately
> the current code works because sizeof(struct attribute **) is the same
> as sizeof(struct attribute *) for x86.

Thanks, kbuild also reported it and I just pushed a fix.

Out of curiosity, there are platforms where size of pointer is different 
from the size of a pointer to a pointer?

Regards,

Tvrtko

> 
> Detected by CoverityScan, CID#1463854 ("Sizeof not portable")
> 
> Fixes: 109ec558370f ("drm/i915/pmu: Only enumerate available counters in sysfs")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>   drivers/gpu/drm/i915/i915_pmu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
> index 95ab5e28f5be..9be4f5201e41 100644
> --- a/drivers/gpu/drm/i915/i915_pmu.c
> +++ b/drivers/gpu/drm/i915/i915_pmu.c
> @@ -794,7 +794,7 @@ create_event_attributes(struct drm_i915_private *i915)
>   		goto err_alloc;
>   
>   	/* Max one pointer of each attribute type plus a termination entry. */
> -	attr = kzalloc((count * 2 + 1) * sizeof(attr), GFP_KERNEL);
> +	attr = kzalloc((count * 2 + 1) * sizeof(*attr), GFP_KERNEL);
>   	if (!attr)
>   		goto err_alloc;
>   
>