linux-kernel - [PATCH 1/7] drm/tilcdc: don't use volatile with iowrite64

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Message-Id: <20170622164817.25515-2-logang@deltatee.com>
Date:   Thu, 22 Jun 2017 10:48:11 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-ntb@...glegroups.com, linux-alpha@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-crypto@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stephen Bates <sbates@...thlin.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Jyri Sarha <jsarha@...com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        David Airlie <airlied@...ux.ie>
Subject: [PATCH 1/7] drm/tilcdc: don't use volatile with iowrite64

This is a prep patch for adding a universal iowrite64.

The patch is to prevent compiler warnings when we add iowrite64 that
would occur because there is an unnecessary volatile in this driver.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Cc: Jyri Sarha <jsarha@...com>
Cc: Tomi Valkeinen <tomi.valkeinen@...com>
Cc: David Airlie <airlied@...ux.ie>
---
 drivers/gpu/drm/tilcdc/tilcdc_regs.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_regs.h b/drivers/gpu/drm/tilcdc/tilcdc_regs.h
index 9d528c0a67a4..e9ce725698a9 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_regs.h
+++ b/drivers/gpu/drm/tilcdc/tilcdc_regs.h
@@ -131,14 +131,14 @@ static inline void tilcdc_write(struct drm_device *dev, u32 reg, u32 data)
 static inline void tilcdc_write64(struct drm_device *dev, u32 reg, u64 data)
 {
 	struct tilcdc_drm_private *priv = dev->dev_private;
-	volatile void __iomem *addr = priv->mmio + reg;
+	void __iomem *addr = priv->mmio + reg;
 
 #ifdef iowrite64
 	iowrite64(data, addr);
 #else
 	__iowmb();
 	/* This compiles to strd (=64-bit write) on ARM7 */
-	*(volatile u64 __force *)addr = __cpu_to_le64(data);
+	*(u64 __force *)addr = __cpu_to_le64(data);
 #endif
 }
 
-- 
2.11.0