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kernel: print warning in rlock() and wlock() when we hold spinlocks

Just like for qlock(), print a warning when
the process calls rlock() and wlock() while
holding a spinlock.

--- a/sys/src/9/port/qlock.c

+++ b/sys/src/9/port/qlock.c

@@ -153,6 +153,11 @@

 {

 	Proc *p;

+	if(m->ilockdepth != 0)

+		print("rlock: %#p: ilockdepth %d\n", getcallerpc(&q), m->ilockdepth);

+	if(up != nil && up->nlocks)

+		print("rlock: %#p: nlocks %d\n", getcallerpc(&q), up->nlocks);

+

 	lock(&q->use);

 	rwstats.rlock++;

 	if(q->writer == 0 && q->head == nil){

@@ -208,6 +213,11 @@

 	uintptr pc;

 	pc = getcallerpc(&q);

+

+	if(m->ilockdepth != 0)

+		print("wlock: %#p: ilockdepth %d\n", pc, m->ilockdepth);

+	if(up != nil && up->nlocks)

+		print("wlock: %#p: nlocks %d\n", pc, up->nlocks);

 	lock(&q->use);

 	rwstats.wlock++;

-- 

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