Re: [PATCH -mm] sys_semctl gcc 4.1 warning fix

[Steven Rostedt <rostedt@goodmis.org>]

Someone emailed me the bug report for gcc:

 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=5035


And in this, it showed the trick to initialize self to turn off that
warning.

Would it be OK to define a macro like:

#ifdef CONFIG_SHOW_ALL_UNINIT_WARNINGS
#  define init_self(x) x
#else
#  define init_self(x) x = x
#endif

Such that we can at least look at the places of bogus uninitialized
warnings and do something like:

Index: ipc/sem.c
===================================================================
--- ipc/sem.c   (revision 796)
+++ ipc/sem.c   (working copy)
@@ -809,7 +809,7 @@
 {
        struct sem_array *sma;
        int err;
-       struct sem_setbuf setbuf;
+       struct sem_setbuf init_self(setbuf);
        struct kern_ipc_perm *ipcp;

        if(cmd == IPC_SET) {


Seems to work.  And if you want to make sure that a place doesn't need it
anymore, use -Winit-self and have a script to do a full make once with
CONFIG_SHOW_ALL_UNINIT_WARNINGS and once with -Winit-self, and make sure
that all the -Winit-self warnings are in the
CONFIG_SHOW_ALL_UNINIT_WARNINGS. Otherwise the init_self isn't needed
anymore.

-- Steve


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