[parisc-linux] some more questions about __raw_write_trylock() hppa implementation

[Joel Soete <soete.joel@scarlet.be>]

Hello all,

I noticed that:
static  __inline__ int __raw_write_trylock(raw_rwlock_t *rw)
{
         __raw_spin_lock(&rw->lock);
         if (rw->counter != 0) {
                 /* this basically never happens */
                 __raw_spin_unlock(&rw->lock);

                 return 0;
         }

         /* got it.  now leave without unlocking */
         rw->counter = -1; /* remember we are locked */
         return 1;
}


so depending the counter is null or not the lock is kept or relaxed?

following my smp pb invextigation the pb I encounter seems to occure rarely and so according to above comment "/* this basically 
never happens */" I place here a panic() in the hope to get a better trace if it start to hang by this place. Unfortunately the 
comment is wrong and system panicing at boot time ;-(

Looking to some other implementation (powerpc and sh in particular), I don't have the feeling that this fnct should have to keep the 
lock in any case. Any idea?

Thanks,
	Joel

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