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 <[email protected]>

Fixes e26a5843f7f5 ("NTB: Split ntb_hw_intel and ntb_transport drivers")

---
Found while building ARM allmodconfig

drivers/ntb/ntb_transport.c +2 -2

index 6e3ee907d186..700f3ae833c2 100644
@@ -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);

Signature · 6 lines

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