linux-kernel - [PATCH 1/7] crypto: caam - remove deadcode on 32-bit platforms

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Date:   Wed, 22 Jul 2020 15:14:52 +0300
From:   Horia Geantă <horia.geanta@....com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Aymen Sghaier <aymen.sghaier@....com>,
        Franck Lenormand <franck.lenormand@....com>,
        Dan Douglass <dan.douglass@....com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        NXP Linux Team <linux-imx@....com>
Subject: [PATCH 1/7] crypto: caam - remove deadcode on 32-bit platforms

From: Franck LENORMAND <franck.lenormand@....com>

When building on a platform with a 32bit DMA address, taking the
upper 32 bits makes no sense.

Signed-off-by: Franck LENORMAND <franck.lenormand@....com>
Signed-off-by: Horia Geantă <horia.geanta@....com>
---
 drivers/crypto/caam/regs.h | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/caam/regs.h b/drivers/crypto/caam/regs.h
index 0f810bc13b2b..af61f3a2c0d4 100644
--- a/drivers/crypto/caam/regs.h
+++ b/drivers/crypto/caam/regs.h
@@ -173,9 +173,14 @@ static inline u64 rd_reg64(void __iomem *reg)
 
 static inline u64 cpu_to_caam_dma64(dma_addr_t value)
 {
-	if (caam_imx)
-		return (((u64)cpu_to_caam32(lower_32_bits(value)) << 32) |
-			 (u64)cpu_to_caam32(upper_32_bits(value)));
+	if (caam_imx) {
+		u64 ret_val = (u64)cpu_to_caam32(lower_32_bits(value)) << 32;
+
+		if (IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT))
+			ret_val |= (u64)cpu_to_caam32(upper_32_bits(value));
+
+		return ret_val;
+	}
 
 	return cpu_to_caam64(value);
 }
-- 
2.17.1