netdev - [PATCH] net: sparx5: fix bitmask on 32-bit targets

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Date:   Mon,  2 Aug 2021 17:21:53 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>
Cc:     Arnd Bergmann <arnd@...db.de>, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net: sparx5: fix bitmask on 32-bit targets

From: Arnd Bergmann <arnd@...db.de>

I saw the build failure that was fixed in commit 6387f65e2acb ("net:
sparx5: fix compiletime_assert for GCC 4.9") and noticed another
issue that was introduced in the same patch: Using GENMASK() to
create a 64-bit mask does not work on 32-bit architectures.

This probably won't ever happen on this driver since it's specific
to a 64-bit SoC, but it's better to write it portably, so use
GENMASK_ULL() instead.

Fixes: f3cad2611a77 ("net: sparx5: add hostmode with phylink support")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/ethernet/microchip/sparx5/sparx5_netdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_netdev.c b/drivers/net/ethernet/microchip/sparx5/sparx5_netdev.c
index 1a240e6bddd0..cb68eaaac881 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_netdev.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_netdev.c
@@ -32,7 +32,7 @@ static void __ifh_encode_bitfield(void *ifh, u64 value, u32 pos, u32 width)
 	u32 byte = (35 - (pos / 8));
 	/* Calculate the Start bit position in the Start IFH byte */
 	u32 bit  = (pos % 8);
-	u64 encode = GENMASK(bit + width - 1, bit) & (value << bit);
+	u64 encode = GENMASK_ULL(bit + width - 1, bit) & (value << bit);
 
 	/* The b0-b7 goes into the start IFH byte */
 	if (encode & 0xFF)
-- 
2.29.2