diff --git a/arch/sparc/lib/locks.S b/arch/sparc/lib/locks.S
index 95fa484..b1df55c 100644
--- a/arch/sparc/lib/locks.S
+++ b/arch/sparc/lib/locks.S
@@ -25,6 +25,15 @@
 	 ldstub	[%g1 + 3], %g2
 	b	___rw_read_enter_spin_on_wlock
 	 ldub	[%g1 + 3], %g2
+___rw_read_try_spin_on_wlock:
+	andcc	%g2, 0xff, %g0
+	be,a	___rw_read_try
+	 ldstub	[%g1 + 3], %g2
+	xnorcc	%g2, 0x0, %o0	/* if g2 is ~0, set o0 to 0 and bugger off */
+	bne,a	___rw_read_enter_spin_on_wlock
+	 ld	[%g1], %g2
+	retl
+	 mov	%g4, %o7
 ___rw_read_exit_spin_on_wlock:
 	orcc	%g2, 0x0, %g0
 	be,a	___rw_read_exit
@@ -60,6 +69,17 @@
 	retl
 	 mov	%g4, %o7
 
+	.globl	___rw_read_try
+___rw_read_try:
+	orcc	%g2, 0x0, %g0
+	bne	___rw_read_try_spin_on_wlock
+	 ld	[%g1], %g2
+	add	%g2, 1, %g2
+	st	%g2, [%g1]
+	set	1, %o1
+	retl
+	 mov	%g4, %o7
+
 	.globl	___rw_write_enter
 ___rw_write_enter:
 	orcc	%g2, 0x0, %g0