linux-kernel - [PATCH 4.2.y-ckt 173/211] NTB: fix 32-bit compiler warning

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Message-Id: <1452023119-25647-174-git-send-email-kamal@canonical.com>
Date:	Tue,  5 Jan 2016 11:44:41 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Arnd Bergmann <arnd@...db.de>, Jon Mason <jdmason@...zu.us>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 173/211] NTB: fix 32-bit compiler warning

4.2.8-ckt1 -stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit fdcb4b2e78220bde95ce4ba3213088e3a1f1cec6 upstream.

resource_size_t may be 32-bit wide on some architectures, which causes
this warning when building the NTB code:

drivers/ntb/ntb_transport.c: In function 'ntb_transport_link_work':
drivers/ntb/ntb_transport.c:828:46: warning: right shift count >= width of type [-Wshift-count-overflow]

The warning is harmless but can be avoided by using the upper_32_bits()
macro.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Fixes: e26a5843f7f5 ("NTB: Split ntb_hw_intel and ntb_transport drivers")
Signed-off-by: Jon Mason <jdmason@...zu.us>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/ntb/ntb_transport.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 1c6386d..f173d95 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -806,10 +806,10 @@ static void ntb_transport_link_work(struct work_struct *work)
 			size = max_mw_size;
 
 		spad = MW0_SZ_HIGH + (i * 2);
-		ntb_peer_spad_write(ndev, spad, (u32)(size >> 32));
+		ntb_peer_spad_write(ndev, spad, upper_32_bits(size));
 
 		spad = MW0_SZ_LOW + (i * 2);
-		ntb_peer_spad_write(ndev, spad, (u32)size);
+		ntb_peer_spad_write(ndev, spad, lower_32_bits(size));
 	}
 
 	ntb_peer_spad_write(ndev, NUM_MWS, nt->mw_count);
-- 
1.9.1

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