On 12/26/08, Randy Dunlap [off-list ref] wrote:

On Thu, 25 Dec 2008 16:17:40 -0800 (PST)
 
David Miller [off-list ref] wrote:
 
 

quoted

From: Hannes Eder <redacted>

 > Date: Mon, 22 Dec 2008 20:15:17 +0100
 >
 > > Fix this sparse warning:
 > >
 > >   drivers/net/niu.c:8850:2: warning: returning void-valued expression
 > >
 > > Signed-off-by: Hannes Eder [off-list ref]
 >
 > Can we just fix sparse not to generate this warning?  It's
 > marginal, at best.  C++ even explicitly defines this as valid
 > and last time I brought this up Linus even agreed.
 
 
Ack, I discussed it with him also and he thought that
 they were just fine as they were...
 

 > The types match, the function returns void and it is returning a void,
 > what is the problem?

In fact there is no need to _fix_ sparse, as there is a command line option
-Wreturn-void / -Wno-return-void, so we could change the Makefile, see diff
below.

---

diff --git a/Makefile b/Makefile
index 64f14aa..cc62984 100644
--- a/Makefile
+++ b/Makefile

@@ -321,7 +321,7 @@ KALLSYMS    = scripts/kallsyms
 PERL           = perl
 CHECK          = sparse
 
-CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
+CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise -Wno-return-void $(CF)
 MODFLAGS       = -DMODULE
 CFLAGS_MODULE   = $(MODFLAGS)
 AFLAGS_MODULE   = $(MODFLAGS)