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From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
To: Colin King <colin.king@canonical.com>,
	Jani Nikula <jani.nikula@linux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	David Airlie <airlied@linux.ie>,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [Intel-gfx] [PATCH][next] drm/i915/pmu: fix sizeof on attr, should be *attr
Date: Fri, 12 Jan 2018 17:48:57 +0000	[thread overview]
Message-ID: <1465951f-474c-e157-892b-33d12ad436cb@linux.intel.com> (raw)
In-Reply-To: <20180112173603.28486-1-colin.king@canonical.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;
>   
> 

WARNING: multiple messages have this Message-ID (diff)
From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
To: Colin King <colin.king@canonical.com>,
	Jani Nikula <jani.nikula@linux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	David Airlie <airlied@linux.ie>,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH][next] drm/i915/pmu: fix sizeof on attr, should be *attr
Date: Fri, 12 Jan 2018 17:48:57 +0000	[thread overview]
Message-ID: <1465951f-474c-e157-892b-33d12ad436cb@linux.intel.com> (raw)
In-Reply-To: <20180112173603.28486-1-colin.king@canonical.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;
>   
> 
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

  reply	other threads:[~2018-01-12 17:48 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-12 17:36 [PATCH][next] drm/i915/pmu: fix sizeof on attr, should be *attr Colin King
2018-01-12 17:36 ` Colin King
2018-01-12 17:48 ` Tvrtko Ursulin [this message]
2018-01-12 17:48   ` Tvrtko Ursulin
2018-01-12 18:08   ` [Intel-gfx] " Colin Ian King
2018-01-12 18:08     ` Colin Ian King
2018-01-12 17:57 ` ✓ Fi.CI.BAT: success for " Patchwork
2018-01-12 19:28 ` ✗ Fi.CI.IGT: failure " Patchwork

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