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From: Arnd Bergmann <arnd@kernel.org>
To: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Lars Povlsen <lars.povlsen@microchip.com>,
	Steen Hegelund <Steen.Hegelund@microchip.com>,
	UNGLinuxDriver@microchip.com,
	Bjarni Jonasson <bjarni.jonasson@microchip.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] net: sparx5: fix bitmask on 32-bit targets
Date: Mon,  2 Aug 2021 17:21:53 +0200	[thread overview]
Message-ID: <20210802152201.1158412-1-arnd@kernel.org> (raw)

From: Arnd Bergmann <arnd@arndb.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@arndb.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


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WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@kernel.org>
To: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Lars Povlsen <lars.povlsen@microchip.com>,
	Steen Hegelund <Steen.Hegelund@microchip.com>,
	UNGLinuxDriver@microchip.com,
	Bjarni Jonasson <bjarni.jonasson@microchip.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] net: sparx5: fix bitmask on 32-bit targets
Date: Mon,  2 Aug 2021 17:21:53 +0200	[thread overview]
Message-ID: <20210802152201.1158412-1-arnd@kernel.org> (raw)

From: Arnd Bergmann <arnd@arndb.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@arndb.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


             reply	other threads:[~2021-08-02 15:24 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 15:21 Arnd Bergmann [this message]
2021-08-02 15:21 ` [PATCH] net: sparx5: fix bitmask on 32-bit targets Arnd Bergmann
2021-08-03 11:00 ` patchwork-bot+netdevbpf
2021-08-03 11:00   ` patchwork-bot+netdevbpf

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