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Subject[PATCH 2.6.21-rc4-mm1 4/4] sys_futex64 : allows 64bit futexes
This last patch is an adaptation of the sys_futex64 syscall provided in -rt
patch (originally written by Ingo Molnar). It allows the use of 64-bit futex.

I have re-worked most of the code to avoid the duplication of the code.

It does not provide the functionality for all architectures (only for x64 for now).

Signed-off-by: Pierre Peiffer <pierre.peiffer@bull.net>

---
include/asm-x86_64/futex.h | 113 ++++++++++++++++++
include/asm-x86_64/unistd.h | 4
include/linux/futex.h | 9 -
include/linux/syscalls.h | 3
kernel/futex.c | 264 +++++++++++++++++++++++++++++++-------------
kernel/futex_compat.c | 3
kernel/sys_ni.c | 1
7 files changed, 313 insertions(+), 84 deletions(-)
Index: b/include/asm-x86_64/futex.h
===================================================================
--- a/include/asm-x86_64/futex.h
+++ b/include/asm-x86_64/futex.h
@@ -41,6 +41,39 @@
"=&r" (tem) \
: "r" (oparg), "i" (-EFAULT), "m" (*uaddr), "1" (0))

+#define __futex_atomic_op1_64(insn, ret, oldval, uaddr, oparg) \
+ __asm__ __volatile ( \
+"1: " insn "\n" \
+"2: .section .fixup,\"ax\"\n\
+3: movq %3, %1\n\
+ jmp 2b\n\
+ .previous\n\
+ .section __ex_table,\"a\"\n\
+ .align 8\n\
+ .quad 1b,3b\n\
+ .previous" \
+ : "=r" (oldval), "=r" (ret), "=m" (*uaddr) \
+ : "i" (-EFAULT), "m" (*uaddr), "0" (oparg), "1" (0))
+
+#define __futex_atomic_op2_64(insn, ret, oldval, uaddr, oparg) \
+ __asm__ __volatile ( \
+"1: movq %2, %0\n\
+ movq %0, %3\n" \
+ insn "\n" \
+"2: " LOCK_PREFIX "cmpxchgq %3, %2\n\
+ jnz 1b\n\
+3: .section .fixup,\"ax\"\n\
+4: movq %5, %1\n\
+ jmp 3b\n\
+ .previous\n\
+ .section __ex_table,\"a\"\n\
+ .align 8\n\
+ .quad 1b,4b,2b,4b\n\
+ .previous" \
+ : "=&a" (oldval), "=&r" (ret), "=m" (*uaddr), \
+ "=&r" (tem) \
+ : "r" (oparg), "i" (-EFAULT), "m" (*uaddr), "1" (0))
+
static inline int
futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
{
@@ -95,6 +128,60 @@ futex_atomic_op_inuser (int encoded_op,
}

static inline int
+futex_atomic_op_inuser64 (int encoded_op, u64 __user *uaddr)
+{
+ int op = (encoded_op >> 28) & 7;
+ int cmp = (encoded_op >> 24) & 15;
+ u64 oparg = (encoded_op << 8) >> 20;
+ u64 cmparg = (encoded_op << 20) >> 20;
+ u64 oldval = 0, ret, tem;
+
+ if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
+ oparg = 1 << oparg;
+
+ if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u64)))
+ return -EFAULT;
+
+ inc_preempt_count();
+
+ switch (op) {
+ case FUTEX_OP_SET:
+ __futex_atomic_op1_64("xchgq %0, %2", ret, oldval, uaddr, oparg);
+ break;
+ case FUTEX_OP_ADD:
+ __futex_atomic_op1_64(LOCK_PREFIX "xaddq %0, %2", ret, oldval,
+ uaddr, oparg);
+ break;
+ case FUTEX_OP_OR:
+ __futex_atomic_op2_64("orq %4, %3", ret, oldval, uaddr, oparg);
+ break;
+ case FUTEX_OP_ANDN:
+ __futex_atomic_op2_64("andq %4, %3", ret, oldval, uaddr, ~oparg);
+ break;
+ case FUTEX_OP_XOR:
+ __futex_atomic_op2_64("xorq %4, %3", ret, oldval, uaddr, oparg);
+ break;
+ 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;
+}
+
+static inline int
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
{
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
@@ -121,5 +208,31 @@ futex_atomic_cmpxchg_inatomic(int __user
return oldval;
}

+static inline u64
+futex_atomic_cmpxchg_inatomic64(u64 __user *uaddr, u64 oldval, u64 newval)
+{
+ if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u64)))
+ return -EFAULT;
+
+ __asm__ __volatile__(
+ "1: " LOCK_PREFIX "cmpxchgq %3, %1 \n"
+
+ "2: .section .fixup, \"ax\" \n"
+ "3: mov %2, %0 \n"
+ " jmp 2b \n"
+ " .previous \n"
+
+ " .section __ex_table, \"a\" \n"
+ " .align 8 \n"
+ " .quad 1b,3b \n"
+ " .previous \n"
+
+ : "=a" (oldval), "=m" (*uaddr)
+ : "i" (-EFAULT), "r" (newval), "0" (oldval)
+ : "memory"
+ );
+
+ return oldval;
+}
#endif
#endif
Index: b/include/asm-x86_64/unistd.h
===================================================================
--- a/include/asm-x86_64/unistd.h
+++ b/include/asm-x86_64/unistd.h
@@ -619,8 +619,10 @@ __SYSCALL(__NR_sync_file_range, sys_sync
__SYSCALL(__NR_vmsplice, sys_vmsplice)
#define __NR_move_pages 279
__SYSCALL(__NR_move_pages, sys_move_pages)
+#define __NR_futex64 280
+__SYSCALL(__NR_futex64, sys_futex64)

-#define __NR_syscall_max __NR_move_pages
+#define __NR_syscall_max __NR_futex64

#ifndef __NO_STUBS
#define __ARCH_WANT_OLD_READDIR
Index: b/include/linux/syscalls.h
===================================================================
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -178,6 +178,9 @@ asmlinkage long sys_set_tid_address(int
asmlinkage long sys_futex(u32 __user *uaddr, int op, u32 val,
struct timespec __user *utime, u32 __user *uaddr2,
u32 val3);
+asmlinkage long sys_futex64(u64 __user *uaddr, int op, u64 val,
+ struct timespec __user *utime, u64 __user *uaddr2,
+ u64 val3);

asmlinkage long sys_init_module(void __user *umod, unsigned long len,
const char __user *uargs);
Index: b/kernel/futex.c
===================================================================
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -61,6 +61,44 @@

#define FUTEX_HASHBITS (CONFIG_BASE_SMALL ? 4 : 8)

+#ifdef CONFIG_64BIT
+static inline unsigned long
+futex_cmpxchg_inatomic(unsigned long __user *uaddr, unsigned long oldval,
+ unsigned long newval, int futex64)
+{
+ if (futex64)
+ return futex_atomic_cmpxchg_inatomic64((u64 __user *)uaddr,
+ oldval, newval);
+ else {
+ u32 ov = oldval, nv = newval;
+ return futex_atomic_cmpxchg_inatomic((int __user *)uaddr, ov,
+ nv);
+ }
+}
+
+static inline int
+futex_get_user(unsigned long *val, unsigned long __user *uaddr, int futex64)
+{
+ int ret;
+
+ if (futex64)
+ ret = get_user(*val, uaddr);
+ else {
+ u32 __user *addr = (u32 __user *)uaddr;
+
+ ret = get_user(*val, addr);
+ }
+ return ret;
+}
+
+#else
+#define futex_cmpxchg_inatomic(uaddr, oldval, newval, futex64) \
+ futex_atomic_cmpxchg_inatomic((u32*)uaddr, oldval, newval)
+
+#define futex_get_user(val, uaddr, futex64) get_user(*val, uaddr)
+
+#endif
+
/*
* Priority Inheritance state:
*/
@@ -140,6 +178,7 @@ static struct futex_hash_bucket *hash_fu
return &futex_queues[hash & ((1 << FUTEX_HASHBITS)-1)];
}

+
/*
* Return 1 if two futex_keys are equal, 0 otherwise.
*/
@@ -162,7 +201,7 @@ static inline int match_futex(union fute
*
* Should be called with &current->mm->mmap_sem but NOT any spinlocks.
*/
-int get_futex_key(u32 __user *uaddr, union futex_key *key)
+int get_futex_key(void __user *uaddr, union futex_key *key)
{
unsigned long address = (unsigned long)uaddr;
struct mm_struct *mm = current->mm;
@@ -271,13 +310,30 @@ void drop_futex_key_refs(union futex_key
}
EXPORT_SYMBOL_GPL(drop_futex_key_refs);

-static inline int get_futex_value_locked(u32 *dest, u32 __user *from)
+static inline int
+get_futex_value_locked(unsigned long *dest, unsigned long __user *from,
+ int futex64)
{
int ret;

+#ifdef CONFIG_64BIT
+ if (futex64) {
+ pagefault_disable();
+ ret = __copy_from_user_inatomic(dest, from, sizeof(u64));
+ pagefault_enable();
+ } else {
+ u32 d;
+ pagefault_disable();
+ ret = __copy_from_user_inatomic(&d, from, sizeof(u32));
+ pagefault_enable();
+
+ *dest = d;
+ }
+#else
pagefault_disable();
ret = __copy_from_user_inatomic(dest, from, sizeof(u32));
pagefault_enable();
+#endif

return ret ? -EFAULT : 0;
}
@@ -550,11 +606,12 @@ static void wake_futex(struct futex_q *q
q->lock_ptr = NULL;
}

-static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this)
+static int wake_futex_pi(unsigned long __user *uaddr, unsigned long uval,
+ struct futex_q *this, int futex64)
{
struct task_struct *new_owner;
struct futex_pi_state *pi_state = this->pi_state;
- u32 curval, newval;
+ unsigned long curval, newval;

if (!pi_state)
return -EINVAL;
@@ -582,7 +639,7 @@ static int wake_futex_pi(u32 __user *uad
newval |= (uval & FUTEX_WAITER_REQUEUED);

pagefault_disable();
- curval = futex_atomic_cmpxchg_inatomic(uaddr, uval, newval);
+ curval = futex_cmpxchg_inatomic(uaddr, uval, newval, futex64);
pagefault_enable();
if (curval == -EFAULT)
return -EFAULT;
@@ -607,16 +664,17 @@ static int wake_futex_pi(u32 __user *uad
return 0;
}

-static int unlock_futex_pi(u32 __user *uaddr, u32 uval)
+static int unlock_futex_pi(unsigned long __user *uaddr, unsigned long uval,
+ int futex64)
{
- u32 oldval;
+ unsigned long oldval;

/*
* There is no waiter, so we unlock the futex. The owner died
* bit has not to be preserved here. We are the owner:
*/
pagefault_disable();
- oldval = futex_atomic_cmpxchg_inatomic(uaddr, uval, 0);
+ oldval = futex_cmpxchg_inatomic(uaddr, uval, 0, futex64);
pagefault_enable();

if (oldval == -EFAULT)
@@ -647,7 +705,7 @@ double_lock_hb(struct futex_hash_bucket
* Wake up all waiters hashed on the physical page that is mapped
* to this virtual address:
*/
-static int futex_wake(u32 __user *uaddr, int nr_wake)
+static int futex_wake(unsigned long __user *uaddr, int nr_wake)
{
struct futex_hash_bucket *hb;
struct futex_q *this, *next;
@@ -690,18 +748,19 @@ out:
* or create a new one without owner.
*/
static inline int
-lookup_pi_state_for_requeue(u32 __user *uaddr, struct futex_hash_bucket *hb,
+lookup_pi_state_for_requeue(unsigned long __user *uaddr,
+ struct futex_hash_bucket *hb,
union futex_key *key,
- struct futex_pi_state **pi_state)
+ struct futex_pi_state **pi_state, int futex64)
{
- u32 curval, uval, newval;
+ unsigned long curval, uval, newval;

retry:
/*
* We can't handle a fault cleanly because we can't
* release the locks here. Simply return the fault.
*/
- if (get_futex_value_locked(&curval, uaddr))
+ if (get_futex_value_locked(&curval, uaddr, futex64))
return -EFAULT;

/* set the flags FUTEX_WAITERS and FUTEX_WAITER_REQUEUED */
@@ -715,7 +774,7 @@ retry:
newval = uval | FUTEX_WAITERS | FUTEX_WAITER_REQUEUED;

pagefault_disable();
- curval = futex_atomic_cmpxchg_inatomic(uaddr, uval, newval);
+ curval = futex_cmpxchg_inatomic(uaddr, uval, newval, futex64);
pagefault_enable();

if (unlikely(curval == -EFAULT))
@@ -746,8 +805,9 @@ retry:
* and requeue the next nr_requeue waiters following hashed on
* one physical page to another physical page (PI-futex uaddr2)
*/
-static int futex_requeue_pi(u32 __user *uaddr1, u32 __user *uaddr2,
- int nr_wake, int nr_requeue, u32 *cmpval)
+static int
+futex_requeue_pi(unsigned long __user *uaddr1, unsigned long __user *uaddr2,
+ int nr_wake, int nr_requeue, unsigned long *cmpval, int futex64)
{
union futex_key key1, key2;
struct futex_hash_bucket *hb1, *hb2;
@@ -780,9 +840,9 @@ retry:
double_lock_hb(hb1, hb2);

if (likely(cmpval != NULL)) {
- u32 curval;
+ unsigned long curval;

- ret = get_futex_value_locked(&curval, uaddr1);
+ ret = get_futex_value_locked(&curval, uaddr1, futex64);

if (unlikely(ret)) {
spin_unlock(&hb1->lock);
@@ -795,7 +855,7 @@ retry:
*/
up_read(&current->mm->mmap_sem);

- ret = get_user(curval, uaddr1);
+ ret = futex_get_user(&curval, uaddr1, futex64);

if (!ret)
goto retry;
@@ -822,7 +882,8 @@ retry:
int s;
/* do this only the first time we requeue someone */
s = lookup_pi_state_for_requeue(uaddr2, hb2,
- &key2, &pi_state2);
+ &key2, &pi_state2,
+ futex64);
if (s) {
ret = s;
goto out_unlock;
@@ -936,8 +997,8 @@ out:
* to this virtual address:
*/
static int
-futex_wake_op(u32 __user *uaddr1, u32 __user *uaddr2,
- int nr_wake, int nr_wake2, int op)
+futex_wake_op(unsigned long __user *uaddr1, unsigned long __user *uaddr2,
+ int nr_wake, int nr_wake2, int op, int futex64)
{
union futex_key key1, key2;
struct futex_hash_bucket *hb1, *hb2;
@@ -961,9 +1022,16 @@ retryfull:
retry:
double_lock_hb(hb1, hb2);

- op_ret = futex_atomic_op_inuser(op, uaddr2);
+#ifdef CONFIG_64BIT
+ if (futex64)
+ op_ret = futex_atomic_op_inuser64(op, (u64 __user *)uaddr2);
+ else
+ op_ret = futex_atomic_op_inuser(op, (int __user *)uaddr2);
+#else
+ op_ret = futex_atomic_op_inuser(op, (int __user *)uaddr2);
+#endif
if (unlikely(op_ret < 0)) {
- u32 dummy;
+ unsigned long dummy;

spin_unlock(&hb1->lock);
if (hb1 != hb2)
@@ -1005,7 +1073,7 @@ retry:
*/
up_read(&current->mm->mmap_sem);

- ret = get_user(dummy, uaddr2);
+ ret = futex_get_user(&dummy, uaddr2, futex64);
if (ret)
return ret;

@@ -1048,8 +1116,9 @@ out:
* Requeue all waiters hashed on one physical page to another
* physical page.
*/
-static int futex_requeue(u32 __user *uaddr1, u32 __user *uaddr2,
- int nr_wake, int nr_requeue, u32 *cmpval)
+static int
+futex_requeue(unsigned long __user *uaddr1, unsigned long __user *uaddr2,
+ int nr_wake, int nr_requeue, unsigned long *cmpval, int futex64)
{
union futex_key key1, key2;
struct futex_hash_bucket *hb1, *hb2;
@@ -1073,9 +1142,9 @@ static int futex_requeue(u32 __user *uad
double_lock_hb(hb1, hb2);

if (likely(cmpval != NULL)) {
- u32 curval;
+ unsigned long curval;

- ret = get_futex_value_locked(&curval, uaddr1);
+ ret = get_futex_value_locked(&curval, uaddr1, futex64);

if (unlikely(ret)) {
spin_unlock(&hb1->lock);
@@ -1088,7 +1157,7 @@ static int futex_requeue(u32 __user *uad
*/
up_read(&current->mm->mmap_sem);

- ret = get_user(curval, uaddr1);
+ ret = futex_get_user(&curval, uaddr1, futex64);

if (!ret)
goto retry;
@@ -1273,13 +1342,13 @@ static void unqueue_me_pi(struct futex_q
* The cur->mm semaphore must be held, it is released at return of this
* function.
*/
-static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
+static int fixup_pi_state_owner(unsigned long __user *uaddr, struct futex_q *q,
struct futex_hash_bucket *hb,
- struct task_struct *curr)
+ struct task_struct *curr, int futex64)
{
- u32 newtid = curr->pid | FUTEX_WAITERS;
+ unsigned long newtid = curr->pid | FUTEX_WAITERS;
struct futex_pi_state *pi_state = q->pi_state;
- u32 uval, curval, newval;
+ unsigned long uval, curval, newval;
int ret;

/* Owner died? */
@@ -1306,12 +1375,12 @@ static int fixup_pi_state_owner(u32 __us
* TID. This must be atomic as we have preserve the
* owner died bit here.
*/
- ret = get_user(uval, uaddr);
+ ret = futex_get_user(&uval, uaddr, futex64);
while (!ret) {
newval = (uval & FUTEX_OWNER_DIED) | newtid;
newval |= (uval & FUTEX_WAITER_REQUEUED);
- curval = futex_atomic_cmpxchg_inatomic(uaddr,
- uval, newval);
+ curval = futex_cmpxchg_inatomic(uaddr,uval,
+ newval, futex64);
if (curval == -EFAULT)
ret = -EFAULT;
if (curval == uval)
@@ -1322,13 +1391,14 @@ static int fixup_pi_state_owner(u32 __us
}

static long futex_wait_restart(struct restart_block *restart);
-static int futex_wait(u32 __user *uaddr, u32 val, ktime_t *abs_time)
+static int futex_wait(unsigned long __user *uaddr, unsigned long val,
+ ktime_t *abs_time, int futex64)
{
struct task_struct *curr = current;
DECLARE_WAITQUEUE(wait, curr);
struct futex_hash_bucket *hb;
struct futex_q q;
- u32 uval;
+ unsigned long uval;
int ret;
struct hrtimer_sleeper t, *to = NULL;
int rem = 0;
@@ -1363,7 +1433,7 @@ static int futex_wait(u32 __user *uaddr,
* We hold the mmap semaphore, so the mapping cannot have changed
* since we looked it up in get_futex_key.
*/
- ret = get_futex_value_locked(&uval, uaddr);
+ ret = get_futex_value_locked(&uval, uaddr, futex64);

if (unlikely(ret)) {
queue_unlock(&q, hb);
@@ -1373,8 +1443,7 @@ static int futex_wait(u32 __user *uaddr,
* start all over again.
*/
up_read(&curr->mm->mmap_sem);
-
- ret = get_user(uval, uaddr);
+ ret = futex_get_user(&uval, uaddr, futex64);

if (!ret)
goto retry;
@@ -1486,7 +1555,7 @@ static int futex_wait(u32 __user *uaddr,

/* mmap_sem and hash_bucket lock are unlocked at
return of this function */
- ret = fixup_pi_state_owner(uaddr, &q, hb, curr);
+ ret = fixup_pi_state_owner(uaddr, &q, hb, curr, futex64);
} else {
/*
* Catch the rare case, where the lock was released
@@ -1526,8 +1595,9 @@ static int futex_wait(u32 __user *uaddr,
restart = &current_thread_info()->restart_block;
restart->fn = futex_wait_restart;
restart->arg0 = (unsigned long)uaddr;
- restart->arg1 = (unsigned long)val;
+ restart->arg1 = val;
restart->arg2 = (unsigned long)abs_time;
+ restart->arg3 = (unsigned long)futex64;
return -ERESTART_RESTARTBLOCK;
}

@@ -1542,12 +1612,13 @@ static int futex_wait(u32 __user *uaddr,

static long futex_wait_restart(struct restart_block *restart)
{
- u32 __user *uaddr = (u32 __user *)restart->arg0;
- u32 val = (u32)restart->arg1;
+ unsigned long __user *uaddr = (unsigned long __user *)restart->arg0;
+ unsigned long val = restart->arg1;
ktime_t *abs_time = (ktime_t *)restart->arg2;
+ int futex64 = (int)restart->arg3;

restart->fn = do_no_restart_syscall;
- return (long)futex_wait(uaddr, val, abs_time);
+ return (long)futex_wait(uaddr, val, abs_time, futex64);
}


@@ -1602,13 +1673,13 @@ static void set_pi_futex_owner(struct fu
* if there are waiters then it will block, it does PI, etc. (Due to
* races the kernel might see a 0 value of the futex too.)
*/
-static int futex_lock_pi(u32 __user *uaddr, int detect, ktime_t *time,
- int trylock)
+static int futex_lock_pi(unsigned long __user *uaddr, int detect, ktime_t *time,
+ int trylock, int futex64)
{
struct hrtimer_sleeper timeout, *to = NULL;
struct task_struct *curr = current;
struct futex_hash_bucket *hb;
- u32 uval, newval, curval;
+ unsigned long uval, newval, curval;
struct futex_q q;
int ret, lock_held, attempt = 0;

@@ -1643,7 +1714,7 @@ static int futex_lock_pi(u32 __user *uad
newval = current->pid;

pagefault_disable();
- curval = futex_atomic_cmpxchg_inatomic(uaddr, 0, newval);
+ curval = futex_cmpxchg_inatomic(uaddr, 0, newval, futex64);
pagefault_enable();

if (unlikely(curval == -EFAULT))
@@ -1688,7 +1759,7 @@ static int futex_lock_pi(u32 __user *uad
newval = curval | FUTEX_WAITERS;

pagefault_disable();
- curval = futex_atomic_cmpxchg_inatomic(uaddr, uval, newval);
+ curval = futex_cmpxchg_inatomic(uaddr, uval, newval, futex64);
pagefault_enable();

if (unlikely(curval == -EFAULT))
@@ -1725,8 +1796,8 @@ static int futex_lock_pi(u32 __user *uad
FUTEX_OWNER_DIED | FUTEX_WAITERS;

pagefault_disable();
- curval = futex_atomic_cmpxchg_inatomic(uaddr,
- uval, newval);
+ curval = futex_cmpxchg_inatomic(uaddr, uval,
+ newval, futex64);
pagefault_enable();

if (unlikely(curval == -EFAULT))
@@ -1770,7 +1841,7 @@ static int futex_lock_pi(u32 __user *uad
*/
if (!ret && q.pi_state->owner != curr)
/* mmap_sem is unlocked at return of this function */
- ret = fixup_pi_state_owner(uaddr, &q, hb, curr);
+ ret = fixup_pi_state_owner(uaddr, &q, hb, curr, futex64);
else {
/*
* Catch the rare case, where the lock was released
@@ -1816,7 +1887,7 @@ static int futex_lock_pi(u32 __user *uad
queue_unlock(&q, hb);
up_read(&curr->mm->mmap_sem);

- ret = get_user(uval, uaddr);
+ ret = futex_get_user(&uval, uaddr, futex64);
if (!ret && (uval != -EFAULT))
goto retry;

@@ -1828,17 +1899,17 @@ static int futex_lock_pi(u32 __user *uad
* This is the in-kernel slowpath: we look up the PI state (if any),
* and do the rt-mutex unlock.
*/
-static int futex_unlock_pi(u32 __user *uaddr)
+static int futex_unlock_pi(unsigned long __user *uaddr, int futex64)
{
struct futex_hash_bucket *hb;
struct futex_q *this, *next;
- u32 uval;
+ unsigned long uval;
struct plist_head *head;
union futex_key key;
int ret, attempt = 0;

retry:
- if (get_user(uval, uaddr))
+ if (futex_get_user(&uval, uaddr, futex64))
return -EFAULT;
/*
* We release only a lock we actually own:
@@ -1865,7 +1936,7 @@ retry_locked:
*/
if (!(uval & FUTEX_OWNER_DIED)) {
pagefault_disable();
- uval = futex_atomic_cmpxchg_inatomic(uaddr, current->pid, 0);
+ uval = futex_cmpxchg_inatomic(uaddr, current->pid, 0, futex64);
pagefault_enable();
}

@@ -1887,7 +1958,7 @@ retry_locked:
plist_for_each_entry_safe(this, next, head, list) {
if (!match_futex (&this->key, &key))
continue;
- ret = wake_futex_pi(uaddr, uval, this);
+ ret = wake_futex_pi(uaddr, uval, this, futex64);
/*
* The atomic access to the futex value
* generated a pagefault, so retry the
@@ -1901,7 +1972,7 @@ retry_locked:
* No waiters - kernel unlocks the futex:
*/
if (!(uval & FUTEX_OWNER_DIED)) {
- ret = unlock_futex_pi(uaddr, uval);
+ ret = unlock_futex_pi(uaddr, uval, futex64);
if (ret == -EFAULT)
goto pi_faulted;
}
@@ -1931,7 +2002,7 @@ pi_faulted:
spin_unlock(&hb->lock);
up_read(&current->mm->mmap_sem);

- ret = get_user(uval, uaddr);
+ ret = futex_get_user(&uval, uaddr, futex64);
if (!ret && (uval != -EFAULT))
goto retry;

@@ -2167,7 +2238,7 @@ retry:
*/
if (!pi) {
if (uval & FUTEX_WAITERS)
- futex_wake(uaddr, 1);
+ futex_wake((unsigned long __user *)uaddr, 1);
}
}
return 0;
@@ -2223,7 +2294,8 @@ void exit_robust_list(struct task_struct
return;

if (pending)
- handle_futex_death((void __user *)pending + futex_offset, curr, pip);
+ handle_futex_death((void __user *)pending + futex_offset,
+ curr, pip);

while (entry != &head->list) {
/*
@@ -2249,42 +2321,46 @@ void exit_robust_list(struct task_struct
}
}

-long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
- u32 __user *uaddr2, u32 val2, u32 val3)
+long do_futex(unsigned long __user *uaddr, int op, unsigned long val,
+ ktime_t *timeout, unsigned long __user *uaddr2,
+ unsigned long val2, unsigned long val3, int fut64)
{
int ret;

switch (op) {
case FUTEX_WAIT:
- ret = futex_wait(uaddr, val, timeout);
+ ret = futex_wait(uaddr, val, timeout, fut64);
break;
case FUTEX_WAKE:
ret = futex_wake(uaddr, val);
break;
case FUTEX_FD:
- /* non-zero val means F_SETOWN(getpid()) & F_SETSIG(val) */
- ret = futex_fd(uaddr, val);
+ if (fut64)
+ ret = -ENOSYS;
+ else
+ /* non-zero val means F_SETOWN(getpid())&F_SETSIG(val) */
+ ret = futex_fd((u32 __user *)uaddr, val);
break;
case FUTEX_REQUEUE:
- ret = futex_requeue(uaddr, uaddr2, val, val2, NULL);
+ ret = futex_requeue(uaddr, uaddr2, val, val2, NULL, fut64);
break;
case FUTEX_CMP_REQUEUE:
- ret = futex_requeue(uaddr, uaddr2, val, val2, &val3);
+ ret = futex_requeue(uaddr, uaddr2, val, val2, &val3, fut64);
break;
case FUTEX_WAKE_OP:
- ret = futex_wake_op(uaddr, uaddr2, val, val2, val3);
+ ret = futex_wake_op(uaddr, uaddr2, val, val2, val3, fut64);
break;
case FUTEX_LOCK_PI:
- ret = futex_lock_pi(uaddr, val, timeout, 0);
+ ret = futex_lock_pi(uaddr, val, timeout, 0, fut64);
break;
case FUTEX_UNLOCK_PI:
- ret = futex_unlock_pi(uaddr);
+ ret = futex_unlock_pi(uaddr, fut64);
break;
case FUTEX_TRYLOCK_PI:
- ret = futex_lock_pi(uaddr, 0, timeout, 1);
+ ret = futex_lock_pi(uaddr, 0, timeout, 1, fut64);
break;
case FUTEX_CMP_REQUEUE_PI:
- ret = futex_requeue_pi(uaddr, uaddr2, val, val2, &val3);
+ ret = futex_requeue_pi(uaddr, uaddr2, val, val2, &val3, fut64);
break;
default:
ret = -ENOSYS;
@@ -2292,6 +2368,37 @@ long do_futex(u32 __user *uaddr, int op,
return ret;
}

+#ifdef CONFIG_64BIT
+
+asmlinkage long
+sys_futex64(u64 __user *uaddr, int op, u64 val,
+ struct timespec __user *utime, u64 __user *uaddr2, u64 val3)
+{
+ struct timespec ts;
+ ktime_t t, *tp = NULL;
+ u64 val2 = 0;
+
+ if (utime && (op == FUTEX_WAIT || op == FUTEX_LOCK_PI)) {
+ if (copy_from_user(&ts, utime, sizeof(ts)) != 0)
+ return -EFAULT;
+ if (!timespec_valid(&ts))
+ return -EINVAL;
+ if (op == FUTEX_WAIT)
+ t = ktime_add(ktime_get(), timespec_to_ktime(ts));
+ tp = &t;
+ }
+ /*
+ * requeue parameter in 'utime' if op == FUTEX_REQUEUE.
+ */
+ if (op == FUTEX_REQUEUE || op == FUTEX_CMP_REQUEUE
+ || op == FUTEX_CMP_REQUEUE_PI)
+ val2 = (unsigned long) utime;
+
+ return do_futex((unsigned long __user*)uaddr, op, val, tp,
+ (unsigned long __user*)uaddr2, val2, val3, 1);
+}
+
+#endif

asmlinkage long sys_futex(u32 __user *uaddr, int op, u32 val,
struct timespec __user *utime, u32 __user *uaddr2,
@@ -2317,7 +2424,8 @@ asmlinkage long sys_futex(u32 __user *ua
|| op == FUTEX_CMP_REQUEUE_PI)
val2 = (u32) (unsigned long) utime;

- return do_futex(uaddr, op, val, tp, uaddr2, val2, val3);
+ return do_futex((unsigned long __user*)uaddr, op, val, tp,
+ (unsigned long __user*)uaddr2, val2, val3, 0);
}

static int futexfs_get_sb(struct file_system_type *fs_type,
Index: b/kernel/sys_ni.c
===================================================================
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -41,6 +41,7 @@ cond_syscall(sys_sendmsg);
cond_syscall(sys_recvmsg);
cond_syscall(sys_socketcall);
cond_syscall(sys_futex);
+cond_syscall(sys_futex64);
cond_syscall(compat_sys_futex);
cond_syscall(sys_set_robust_list);
cond_syscall(compat_sys_set_robust_list);
Index: b/include/linux/futex.h
===================================================================
--- a/include/linux/futex.h
+++ b/include/linux/futex.h
@@ -101,8 +101,9 @@ struct robust_list_head {
#define ROBUST_LIST_LIMIT 2048

#ifdef __KERNEL__
-long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
- u32 __user *uaddr2, u32 val2, u32 val3);
+long do_futex(unsigned long __user *uaddr, int op, unsigned long val,
+ ktime_t *timeout, unsigned long __user *uaddr2,
+ unsigned long val2, unsigned long val3, int futex64);

extern int
handle_futex_death(u32 __user *uaddr, struct task_struct *curr, int pi);
@@ -116,7 +117,7 @@ handle_futex_death(u32 __user *uaddr, st
* We set bit 0 to indicate if it's an inode-based key.
*/
union futex_key {
- u32 __user *uaddr;
+ unsigned long __user *uaddr;
struct {
unsigned long pgoff;
struct inode *inode;
@@ -133,7 +134,7 @@ union futex_key {
int offset;
} both;
};
-int get_futex_key(u32 __user *uaddr, union futex_key *key);
+int get_futex_key(void __user *uaddr, union futex_key *key);
void get_futex_key_refs(union futex_key *key);
void drop_futex_key_refs(union futex_key *key);

Index: b/kernel/futex_compat.c
===================================================================
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -158,5 +158,6 @@ asmlinkage long compat_sys_futex(u32 __u
|| op == FUTEX_CMP_REQUEUE_PI)
val2 = (int) (unsigned long) utime;

- return do_futex(uaddr, op, val, tp, uaddr2, val2, val3);
+ return do_futex((unsigned long __user*)uaddr, op, val, tp,
+ (unsigned long __user*)uaddr2, val2, val3, 0);
}
--
Pierre Peiffer
-
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