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From: Thierry Reding <thierry.reding@gmail.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "Jammy Zhou" <Jammy.Zhou@amd.com>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	"David Zhang" <david1.zhang@amd.com>,
	"Eric Huang" <JinHuiEric.Huang@amd.com>,
	"Alex Deucher" <alexander.deucher@amd.com>,
	"Christian König" <christian.koenig@amd.com>
Subject: Re: [PATCH] drm: powerplay: use div64_s64 instead of do_div
Date: Mon, 4 Jan 2016 09:17:50 +0100	[thread overview]
Message-ID: <20160104081750.GA23797@ulmo> (raw)
In-Reply-To: <5249276.tkZ1gbxakA@wuerfel>


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On Fri, Jan 01, 2016 at 02:07:41PM +0100, Arnd Bergmann wrote:
> The newly added code for Fiji creates a correct compiler warning
> about invalid use of the do_div macro:
> 
> In file included from powerplay/hwmgr/ppatomctrl.c:31:0:
> drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/ppevvmath.h: In function 'fDivide':
> drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/ppevvmath.h:382:89: warning: comparison of distinct pointer types lacks a cast
>      do_div(longlongX, longlongY); /*Q(32,32) divided by Q(16,16) = Q(16,16) Back to original format */
> 
> do_div() divides an unsigned 64-bit number by an unsigned 32-bit number.
> The code instead wants to divide two signed 64-bit numbers, which is done
> using the div64_s64 function.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Fixes: 770911a3cfbb ("drm/amd/powerplay: add/update headers for Fiji SMU and DPM")
> ---
> Found on ARM allmodconfig on yesterday's linux-next 

Reviewed-by: Thierry Reding <treding@nvidia.com>

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WARNING: multiple messages have this Message-ID (diff)
From: Thierry Reding <thierry.reding@gmail.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "Jammy Zhou" <Jammy.Zhou@amd.com>,
	"David Airlie" <airlied@linux.ie>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	"Alex Deucher" <alexander.deucher@amd.com>,
	"David Zhang" <david1.zhang@amd.com>,
	"Eric Huang" <JinHuiEric.Huang@amd.com>,
	"Christian König" <christian.koenig@amd.com>
Subject: Re: [PATCH] drm: powerplay: use div64_s64 instead of do_div
Date: Mon, 4 Jan 2016 09:17:50 +0100	[thread overview]
Message-ID: <20160104081750.GA23797@ulmo> (raw)
In-Reply-To: <5249276.tkZ1gbxakA@wuerfel>

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On Fri, Jan 01, 2016 at 02:07:41PM +0100, Arnd Bergmann wrote:
> The newly added code for Fiji creates a correct compiler warning
> about invalid use of the do_div macro:
> 
> In file included from powerplay/hwmgr/ppatomctrl.c:31:0:
> drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/ppevvmath.h: In function 'fDivide':
> drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/ppevvmath.h:382:89: warning: comparison of distinct pointer types lacks a cast
>      do_div(longlongX, longlongY); /*Q(32,32) divided by Q(16,16) = Q(16,16) Back to original format */
> 
> do_div() divides an unsigned 64-bit number by an unsigned 32-bit number.
> The code instead wants to divide two signed 64-bit numbers, which is done
> using the div64_s64 function.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Fixes: 770911a3cfbb ("drm/amd/powerplay: add/update headers for Fiji SMU and DPM")
> ---
> Found on ARM allmodconfig on yesterday's linux-next 

Reviewed-by: Thierry Reding <treding@nvidia.com>

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  reply	other threads:[~2016-01-04  8:17 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-01 13:07 [PATCH] drm: powerplay: use div64_s64 instead of do_div Arnd Bergmann
2016-01-01 13:07 ` Arnd Bergmann
2016-01-04  8:17 ` Thierry Reding [this message]
2016-01-04  8:17   ` Thierry Reding
2016-01-04 12:48 ` Christian König
2016-01-04 12:48   ` Christian König
2016-01-04 15:42 ` Alex Deucher
2016-01-04 15:42   ` Alex Deucher

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