Subject: linux-next: build warning after merge of the rdma tree

From: Stephen Rothwell <[email-masked]>
Date: Thu, 14 Feb 2019 11:23:00 +1100

Hi all,

After merging the rdma tree, today's linux-next build (x86_64
allmodconfig) produced this warning:

drivers/infiniband/hw/hfi1/tid_rdma.c: In function 'hfi1_tid_rdma_wqe_interlock':
drivers/infiniband/hw/hfi1/tid_rdma.c:3251:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   switch (prev->wr.opcode) {
   ^~~~~~
drivers/infiniband/hw/hfi1/tid_rdma.c:3259:2: note: here
  case IB_WR_RDMA_READ:
  ^~~~

Introduced by commit

  c6c231175ccd ("IB/hfi1: Add interlock between TID RDMA WRITE and other requests")

I get this warning because I am building with -Wimplicit-fallthrough
in attempt to catch new additions early.  The gcc warning can be turned
off by adding a /* fall through */ comment at the point the fall through
happens (assuming that the fall through is intentional).

-- 
Cheers,
Stephen Rothwell