[PATCH v4 1/2] sunrpc: fix unused variable warnings by using no_printk

[Sean Chang <seanwascoding@gmail.com>]

When CONFIG_SUNRPC_DEBUG is disabled, the dfprintk() macros currently
expand to empty do-while loops. This causes variables used solely
within these calls to appear unused, triggering -Wunused-variable
warnings.

Instead of marking every affected variable with __maybe_unused,
update the dfprintk and dfprintk_rcu stubs to use no_printk().
This allows the compiler to see the variables and perform type
checking without emitting any code, thus silencing the warnings
globally for these macros.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Sean Chang <seanwascoding@gmail.com>
---
 include/linux/sunrpc/debug.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/sunrpc/debug.h b/include/linux/sunrpc/debug.h
index eb4bd62df319..55c54df8bc7d 100644
--- a/include/linux/sunrpc/debug.h
+++ b/include/linux/sunrpc/debug.h
@@ -52,8 +52,8 @@ do {									\
 # define RPC_IFDEBUG(x)		x
 #else
 # define ifdebug(fac)		if (0)
-# define dfprintk(fac, fmt, ...)	do {} while (0)
-# define dfprintk_rcu(fac, fmt, ...)	do {} while (0)
+# define dfprintk(fac, fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
+# define dfprintk_rcu(fac, fmt, ...)	no_printk(fmt, ##__VA_ARGS__)
 # define RPC_IFDEBUG(x)
 #endif
 
-- 
2.34.1