panic mutex

[KIYOHARA Takashi <kiyohara%kk.iij4u.or.jp@localhost>]

Hi! all,


I encounter a (compiler?) bug?
My bebox panics on mutex_enter() in joyattach().
mtxm_owner (or mtxp_a) is initialized in mutex_init().  However, it
becomes dirty when seting the address to sc->sc_lock.


Index: joy_isa.c
===================================================================
RCS file: /cvsroot/src/sys/dev/isa/joy_isa.c,v
retrieving revision 1.13
diff -u -r1.13 joy_isa.c
--- joy_isa.c   23 Nov 2011 23:07:32 -0000      1.13
+++ joy_isa.c   5 Dec 2011 14:57:28 -0000
@@ -117,7 +117,10 @@
        }
 
        mutex_init(&isc->sc_lock, MUTEX_DEFAULT, IPL_NONE);
+printf("%s: mutex=%d, 0x%x, 0x%x, 0x%x\n", __func__, sizeof(isc->sc_lock), 
isc->sc_lock.u.p.mtxp_a, isc->sc_lock.u.p.mtxp_b[0], 
isc->sc_lock.u.p.mtxp_b[1]);
        sc->sc_lock = &isc->sc_lock;
+printf("%s: Re: sc mutex=%p, 0x%x, 0x%x, 0x%x\n", __func__, sc->sc_lock, 
sc->sc_lock->u.p.mtxp_a, sc->sc_lock->u.p.mtxp_b[0], 
sc->sc_lock->u.p.mtxp_b[1]);
+printf("%s: Re: isc mutex=%p, 0x%x, 0x%x, 0x%x\n", __func__, &isc->sc_lock, 
isc->sc_lock.u.p.mtxp_a, isc->sc_lock.u.p.mtxp_b[0], 
isc->sc_lock.u.p.mtxp_b[1]);
 
        joyattach(sc);
 }



joy_isa_attach: mutex=12, 0x0, 0x0, 0x0
joy_isa_attach: Re: sc mutex=0xd97c2d14, 0xd97c2d14, 0x0, 0x0
joy_isa_attach: Re: isc mutex=0xd97c2d14, 0xd97c2d14, 0x0, 0x0


arch/powerpc/include/mutex.h ---
struct kmutex {
        union {
#ifdef __MUTEX_PRIVATE
                struct {
                        volatile uintptr_t      mtxm_owner;
                        ipl_cookie_t            mtxm_ipl;
                        __cpu_simple_lock_t     mtxm_lock;
                } m;
#endif
                struct {
                        uintptr_t               mtxp_a;
                        uint32_t                mtxp_b[2];
                } p;
        } u;
};
---------------------------------


Can I resolve this problem?

Thanks,
--
kiyohara