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fedora core 6 1.2949 + vserver 2.2.0
[linux-2.6.git]
/
arch
/
sparc
/
lib
/
locks.S
diff --git
a/arch/sparc/lib/locks.S
b/arch/sparc/lib/locks.S
index
95fa484
..
b1df55c
100644
(file)
--- 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
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
___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
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
.globl ___rw_write_enter
___rw_write_enter:
orcc %g2, 0x0, %g0