The newly added function triggers a harmless warning:

drivers/staging/lustre/lustre/ptlrpc/pack_generic.c: In function 
'lustre_shrink_msg':
drivers/staging/lustre/lustre/ptlrpc/pack_generic.c:472:1: error: control 
reaches end of non-void function [-Werror=return-type]

This probably happens because LASSERTF() contains an 'unlikely()' that
sometimes prevents gcc from analysing the control flow correctly.
Adding a return statement here seems harmless and lets us keep that
unlikely().

Fixes: 96049bd1ecd0 ("staging: lustre: ptlrpc: embed highest XID in each 
request")
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/staging/lustre/lustre/ptlrpc/pack_generic.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/lustre/lustre/ptlrpc/pack_generic.c 
b/drivers/staging/lustre/lustre/ptlrpc/pack_generic.c
index 13f00b7cbbe5..b1170277fd84 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/pack_generic.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/pack_generic.c
@@ -469,6 +469,7 @@ int lustre_shrink_msg(struct lustre_msg *msg, int segment,
        default:
                LASSERTF(0, "incorrect message magic: %08x\n", msg->lm_magic);
        }
+       return 0;
 }
 EXPORT_SYMBOL(lustre_shrink_msg);
 
-- 
2.9.0

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