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authorDavid Howells <dhowells@redhat.com>2006-01-06 03:11:43 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 11:33:33 -0500
commit5c40f7f373889930d176a515ec375b60a70b5b49 (patch)
tree718d63553f5b9b23c5883592a2fe45b84f275687 /include/asm-frv/futex.h
parentb0e15190ead07056ab0c3844a499ff35e66d27cc (diff)
[PATCH] FRV: Implement futex operations for FRV
The attached patch implements futex operations for the FRV architecture. The operations are applicable to both MMU and no-MMU modes; though the EFAULT handling will be a little bit of wasted space on the latter. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-frv/futex.h')
-rw-r--r--include/asm-frv/futex.h42
1 files changed, 1 insertions, 41 deletions
diff --git a/include/asm-frv/futex.h b/include/asm-frv/futex.h
index 9feff4ce1424..fca9d90e32c9 100644
--- a/include/asm-frv/futex.h
+++ b/include/asm-frv/futex.h
@@ -7,47 +7,7 @@
7#include <asm/errno.h> 7#include <asm/errno.h>
8#include <asm/uaccess.h> 8#include <asm/uaccess.h>
9 9
10static inline int 10extern int futex_atomic_op_inuser(int encoded_op, int __user *uaddr);
11futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
12{
13 int op = (encoded_op >> 28) & 7;
14 int cmp = (encoded_op >> 24) & 15;
15 int oparg = (encoded_op << 8) >> 20;
16 int cmparg = (encoded_op << 20) >> 20;
17 int oldval = 0, ret;
18 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
19 oparg = 1 << oparg;
20
21 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
22 return -EFAULT;
23
24 inc_preempt_count();
25
26 switch (op) {
27 case FUTEX_OP_SET:
28 case FUTEX_OP_ADD:
29 case FUTEX_OP_OR:
30 case FUTEX_OP_ANDN:
31 case FUTEX_OP_XOR:
32 default:
33 ret = -ENOSYS;
34 }
35
36 dec_preempt_count();
37
38 if (!ret) {
39 switch (cmp) {
40 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
41 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
42 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
43 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
44 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
45 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
46 default: ret = -ENOSYS;
47 }
48 }
49 return ret;
50}
51 11
52#endif 12#endif
53#endif 13#endif