linux-kernel - Re: linux-next: build warning after merge of the drm tree

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Date:   Wed, 23 Sep 2020 09:27:53 +0300
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Dave Airlie <airlied@...ux.ie>,
        DRI <dri-devel@...ts.freedesktop.org>
CC:     Swapnil Jakhade <sjakhade@...ence.com>, Jyri Sarha <jsarha@...com>,
        Quentin Schulz <quentin.schulz@...e-electrons.com>,
        Yuti Amonkar <yamonkar@...ence.com>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the drm tree

Hi Stephen,

On 23/09/2020 06:36, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the drm tree, today's linux-next build (x86_64 allmodconfig)
> produced this warning:
> 
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c: In function 'cdns_mhdp_fw_activate':
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c:751:10: warning: conversion from 'long unsigned int' to 'unsigned int' changes value from '18446744073709551613' to '4294967293' [-Woverflow]
>   751 |   writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c: In function 'cdns_mhdp_attach':
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c:1692:10: warning: conversion from 'long unsigned int' to 'unsigned int' changes value from '18446744073709551613' to '4294967293' [-Woverflow]
>  1692 |   writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c: In function 'cdns_mhdp_bridge_hpd_enable':
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c:2125:10: warning: conversion from 'long unsigned int' to 'unsigned int' changes value from '18446744073709551613' to '4294967293' [-Woverflow]
>  2125 |   writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
> 
> Introduced by commit
> 
>   fb43aa0acdfd ("drm: bridge: Add support for Cadence MHDP8546 DPI/DP bridge")
> 

Thanks. I think we can just do:

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index 621ebdbff8a3..d0c65610ebb5 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -748,7 +748,7 @@ static int cdns_mhdp_fw_activate(const struct firmware *fw,
 	 * bridge should already be detached.
 	 */
 	if (mhdp->bridge_attached)
-		writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
+		writel(~(u32)CDNS_APB_INT_MASK_SW_EVENT_INT,
 		       mhdp->regs + CDNS_APB_INT_MASK);
 
 	spin_unlock(&mhdp->start_lock);
@@ -1689,7 +1689,7 @@ static int cdns_mhdp_attach(struct drm_bridge *bridge,
 
 	/* Enable SW event interrupts */
 	if (hw_ready)
-		writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
+		writel(~(u32)CDNS_APB_INT_MASK_SW_EVENT_INT,
 		       mhdp->regs + CDNS_APB_INT_MASK);
 
 	return 0;
@@ -2122,7 +2122,7 @@ static void cdns_mhdp_bridge_hpd_enable(struct drm_bridge *bridge)
 
 	/* Enable SW event interrupts */
 	if (mhdp->bridge_attached)
-		writel(~CDNS_APB_INT_MASK_SW_EVENT_INT,
+		writel(~(u32)CDNS_APB_INT_MASK_SW_EVENT_INT,
 		       mhdp->regs + CDNS_APB_INT_MASK);
 }

I'll send a patch.

 Tomi

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