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When compiling for i686, drivers/infiniband/hw/cxgb4/device.o 
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fails to compile:
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drivers/infiniband/hw/cxgb4/device.c: In function 'wr_log_show':
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include/linux/ktime.h:84:36: error: 'prev_time.tv64' may be used uninitialized in this function [-Werror=maybe-uninitialized]
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({ (ktime_t){ .tv64 = (lhs).tv64 - (rhs).tv64 }; })
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^
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drivers/infiniband/hw/cxgb4/device.c:133:10: note: 'prev_time.tv64' was declared here
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ktime_t prev_time;
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^
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cc1: all warnings being treated as errors
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make[5]: *** [drivers/infiniband/hw/cxgb4/device.o] Error 1
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I don't know why x86_64 is compiling without this patch.
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Compiler (gcc) version dependence?
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diff -up ./drivers/infiniband/hw/cxgb4/device.c.tv64 ./drivers/infiniband/hw/cxgb4/device.c
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--- ./drivers/infiniband/hw/cxgb4/device.c.tv64	2018-10-05 05:18:19.000000000 +0900
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+++ ./drivers/infiniband/hw/cxgb4/device.c	2018-11-01 09:34:48.000000000 +0900
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@@ -130,7 +130,7 @@ void c4iw_log_wr_stats(struct t4_wq *wq,
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 static int wr_log_show(struct seq_file *seq, void *v)
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 {
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 	struct c4iw_dev *dev = seq->private;
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-	ktime_t prev_time;
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+	ktime_t prev_time = { .tv64 = 0 };
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 	struct wr_log_entry *lep;
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 	int prev_time_set = 0;
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 	int idx, end;