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| author | Jeff Dike <jdike@addtoit.com> | 2006-01-08 01:01:32 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-08 20:13:39 -0800 |
| commit | f8aaeacec159f2d9003872781fa4d49659e347fb (patch) | |
| tree | f59dc7ae8fccc41e2ded098182a146086c6e2239 /include/asm-generic | |
| parent | c66fdd5e324392584c6f11de65cfe24b0e2d9303 (diff) | |
| download | linux-3.10-f8aaeacec159f2d9003872781fa4d49659e347fb.tar.gz linux-3.10-f8aaeacec159f2d9003872781fa4d49659e347fb.tar.bz2 linux-3.10-f8aaeacec159f2d9003872781fa4d49659e347fb.zip | |
[PATCH] consolidate asm/futex.h
Most of the architectures have the same asm/futex.h. This consolidates them
into asm-generic, with the arches including it from their own asm/futex.h.
In the case of UML, this reverts the old broken futex.h and goes back to using
the same one as almost everyone else.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/futex.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/include/asm-generic/futex.h b/include/asm-generic/futex.h new file mode 100644 index 00000000000..3ae2c734754 --- /dev/null +++ b/include/asm-generic/futex.h @@ -0,0 +1,53 @@ +#ifndef _ASM_GENERIC_FUTEX_H +#define _ASM_GENERIC_FUTEX_H + +#ifdef __KERNEL__ + +#include <linux/futex.h> +#include <asm/errno.h> +#include <asm/uaccess.h> + +static inline int +futex_atomic_op_inuser (int encoded_op, int __user *uaddr) +{ + int op = (encoded_op >> 28) & 7; + int cmp = (encoded_op >> 24) & 15; + int oparg = (encoded_op << 8) >> 20; + int cmparg = (encoded_op << 20) >> 20; + int oldval = 0, ret; + if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) + oparg = 1 << oparg; + + if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) + return -EFAULT; + + inc_preempt_count(); + + switch (op) { + case FUTEX_OP_SET: + case FUTEX_OP_ADD: + case FUTEX_OP_OR: + case FUTEX_OP_ANDN: + case FUTEX_OP_XOR: + default: + ret = -ENOSYS; + } + + dec_preempt_count(); + + if (!ret) { + switch (cmp) { + case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; + case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; + case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; + case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; + case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; + case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; + default: ret = -ENOSYS; + } + } + return ret; +} + +#endif +#endif |