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authorDavid S. Miller <davem@davemloft.net>2012-05-20 00:51:02 -0400
committerDavid S. Miller <davem@davemloft.net>2012-05-20 00:51:02 -0400
commit4f722a62aac3a785713ba27fa189672d50231992 (patch)
tree81e2e73174a236c331281da8934a93e15d6263b2 /arch/sparc/include
parenta11b246a48dc51bb29969622c59090d621f3b849 (diff)
sparc32: Delete asm/smpprim.h
Completely unused. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/include')
-rw-r--r--arch/sparc/include/asm/smpprim.h54
1 files changed, 0 insertions, 54 deletions
diff --git a/arch/sparc/include/asm/smpprim.h b/arch/sparc/include/asm/smpprim.h
deleted file mode 100644
index eb849d862c64..000000000000
--- a/arch/sparc/include/asm/smpprim.h
+++ /dev/null
@@ -1,54 +0,0 @@
1/*
2 * smpprim.h: SMP locking primitives on the Sparc
3 *
4 * God knows we won't be actually using this code for some time
5 * but I thought I'd write it since I knew how.
6 *
7 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
8 */
9
10#ifndef __SPARC_SMPPRIM_H
11#define __SPARC_SMPPRIM_H
12
13/* Test and set the unsigned byte at ADDR to 1. Returns the previous
14 * value. On the Sparc we use the ldstub instruction since it is
15 * atomic.
16 */
17
18static inline __volatile__ char test_and_set(void *addr)
19{
20 char state = 0;
21
22 __asm__ __volatile__("ldstub [%0], %1 ! test_and_set\n\t"
23 "=r" (addr), "=r" (state) :
24 "0" (addr), "1" (state) : "memory");
25
26 return state;
27}
28
29/* Initialize a spin-lock. */
30static inline __volatile__ smp_initlock(void *spinlock)
31{
32 /* Unset the lock. */
33 *((unsigned char *) spinlock) = 0;
34
35 return;
36}
37
38/* This routine spins until it acquires the lock at ADDR. */
39static inline __volatile__ smp_lock(void *addr)
40{
41 while(test_and_set(addr) == 0xff)
42 ;
43
44 /* We now have the lock */
45 return;
46}
47
48/* This routine releases the lock at ADDR. */
49static inline __volatile__ smp_unlock(void *addr)
50{
51 *((unsigned char *) addr) = 0;
52}
53
54#endif /* !(__SPARC_SMPPRIM_H) */