1 files changed, 20 insertions, 0 deletions

diff --git a/arch/sparc/lib/locks.S b/arch/sparc/lib/locks.S
index 95fa4842496..b1df55cb221 100644
--- a/arch/sparc/lib/locks.S
+++ b/arch/sparc/lib/locks.S
@@ -25,6 +25,15 @@ ___rw_read_enter_spin_on_wlock:
          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 @@ ___rw_read_exit:
         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