update: sync

[l4.git] / l4 / pkg / linux-26-headers / include / asm-x86 / mutex_64.h

diff --git a/l4/pkg/linux-26-headers/include/asm-x86/mutex_64.h b/l4/pkg/linux-26-headers/include/asm-x86/mutex_64.h
deleted file mode 100644 (file)
index f3fae9b..0000000
--- a/l4/pkg/linux-26-headers/include/asm-x86/mutex_64.h
+++ /dev/null
@@ -1,100 +0,0 @@
-/*
- * Assembly implementation of the mutex fastpath, based on atomic
- * decrement/increment.
- *
- * started by Ingo Molnar:
- *
- *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
- */
-#ifndef _ASM_MUTEX_H
-#define _ASM_MUTEX_H
-
-/**
- * __mutex_fastpath_lock - decrement and call function if negative
- * @v: pointer of type atomic_t
- * @fail_fn: function to call if the result is negative
- *
- * Atomically decrements @v and calls <fail_fn> if the result is negative.
- */
-#define __mutex_fastpath_lock(v, fail_fn)                      \
-do {                                                           \
-       unsigned long dummy;                                    \
-                                                               \
-       typecheck(atomic_t *, v);                               \
-       typecheck_fn(void (*)(atomic_t *), fail_fn);            \
-                                                               \
-       asm volatile(LOCK_PREFIX "   decl (%%rdi)\n"            \
-                    "   jns 1f         \n"                     \
-                    "   call " #fail_fn "\n"                   \
-                    "1:"                                       \
-                    : "=D" (dummy)                             \
-                    : "D" (v)                                  \
-                    : "rax", "rsi", "rdx", "rcx",              \
-                      "r8", "r9", "r10", "r11", "memory");     \
-} while (0)
-
-/**
- *  __mutex_fastpath_lock_retval - try to take the lock by moving the count
- *                                 from 1 to a 0 value
- *  @count: pointer of type atomic_t
- *  @fail_fn: function to call if the original value was not 1
- *
- * Change the count from 1 to a value lower than 1, and call <fail_fn> if
- * it wasn't 1 originally. This function returns 0 if the fastpath succeeds,
- * or anything the slow path function returns
- */
-static inline int __mutex_fastpath_lock_retval(atomic_t *count,
-                                              int (*fail_fn)(atomic_t *))
-{
-       if (unlikely(atomic_dec_return(count) < 0))
-               return fail_fn(count);
-       else
-               return 0;
-}
-
-/**
- * __mutex_fastpath_unlock - increment and call function if nonpositive
- * @v: pointer of type atomic_t
- * @fail_fn: function to call if the result is nonpositive
- *
- * Atomically increments @v and calls <fail_fn> if the result is nonpositive.
- */
-#define __mutex_fastpath_unlock(v, fail_fn)                    \
-do {                                                           \
-       unsigned long dummy;                                    \
-                                                               \
-       typecheck(atomic_t *, v);                               \
-       typecheck_fn(void (*)(atomic_t *), fail_fn);            \
-                                                               \
-       asm volatile(LOCK_PREFIX "   incl (%%rdi)\n"            \
-                    "   jg 1f\n"                               \
-                    "   call " #fail_fn "\n"                   \
-                    "1:"                                       \
-                    : "=D" (dummy)                             \
-                    : "D" (v)                                  \
-                    : "rax", "rsi", "rdx", "rcx",              \
-                      "r8", "r9", "r10", "r11", "memory");     \
-} while (0)
-
-#define __mutex_slowpath_needs_to_unlock()     1
-
-/**
- * __mutex_fastpath_trylock - try to acquire the mutex, without waiting
- *
- *  @count: pointer of type atomic_t
- *  @fail_fn: fallback function
- *
- * Change the count from 1 to 0 and return 1 (success), or return 0 (failure)
- * if it wasn't 1 originally. [the fallback function is never used on
- * x86_64, because all x86_64 CPUs have a CMPXCHG instruction.]
- */
-static inline int __mutex_fastpath_trylock(atomic_t *count,
-                                          int (*fail_fn)(atomic_t *))
-{
-       if (likely(atomic_cmpxchg(count, 1, 0) == 1))
-               return 1;
-       else
-               return 0;
-}
-
-#endif