[PATCH v2 2/3] net/sfc: fix non-constant expression inr RTE_BUILD_BUG_ON()

[Stephen Hemminger]

The macro RTE_MIN has some hidden assignments to provide type
safety which means the statement can not be fully evaluted in
first pass of compiler. Replace RTE_MIN() with equivalent macro.

This will cause errors from checkpatch about multiple evaluations
of same expression in macro but it is ok in this case.

Fixes: 4f936666d790 ("net/sfc: support TSO for EF100 native datapath")
Cc: ivan.malov at oktetlabs.ru
Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
---
 drivers/net/sfc/sfc_ef100_tx.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/sfc/sfc_ef100_tx.c b/drivers/net/sfc/sfc_ef100_tx.c
index 1b6374775f07..f4bcadc1e8e0 100644
--- a/drivers/net/sfc/sfc_ef100_tx.c
+++ b/drivers/net/sfc/sfc_ef100_tx.c
@@ -26,6 +26,10 @@
 #include "sfc_ef100.h"
 #include "sfc_nic_dma_dp.h"
 
+#ifndef MIN
+/* not typesafe but is a constant */
+#define MIN(x, y) ((x) < (y) ? (x) : (y))
+#endif
 
 #define sfc_ef100_tx_err(_txq, ...) \
 	SFC_DP_LOG(SFC_KVARG_DATAPATH_EF100, ERR, &(_txq)->dp.dpq, __VA_ARGS__)
@@ -563,8 +567,7 @@ sfc_ef100_tx_pkt_descs_max(const struct rte_mbuf *m)
 		 * (split into many Tx descriptors).
 		 */
 		RTE_BUILD_BUG_ON(SFC_EF100_TX_SEND_DESC_LEN_MAX <
-				 RTE_MIN((unsigned int)EFX_MAC_PDU_MAX,
-				 SFC_MBUF_SEG_LEN_MAX));
+				 MIN((unsigned int)EFX_MAC_PDU_MAX, SFC_MBUF_SEG_LEN_MAX));
 	}
 
 	if (m->ol_flags & sfc_dp_mport_override) {
-- 
2.39.2