linux-kernel - [PATCH] NTB: fix 32-bit compiler warning

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Date:	Wed, 07 Oct 2015 09:59:34 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Jon Mason <jdmason@...zu.us>, Dave Jiang <dave.jiang@...el.com>,
	Allen Hubbe <Allen.Hubbe@....com>
Cc:	linux-ntb@...glegroups.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] NTB: fix 32-bit compiler warning

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")
---
Found while building ARM allmodconfig

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 6e3ee907d186..700f3ae833c2 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -825,10 +825,10 @@ 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);

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