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futex: Propagate flags into get_futex_key()

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Instead of only passing FLAGS_SHARED as a boolean, pass down flags as
a whole.

No functional change intended.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230921105248.282857501@noisy.programming.kicks-ass.net
This commit is contained in:
peterz@infradead.org 2023-09-21 12:45:13 +02:00 committed by Peter Zijlstra
parent cb8c4312af
commit 3b63a55f49
5 changed files with 18 additions and 15 deletions
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7
kernel/futex/core.c
View File

@ -193,7 +193,7 @@ static u64 get_inode_sequence_number(struct inode *inode)
/**
* get_futex_key() - Get parameters which are the keys for a futex
* @uaddr: virtual address of the futex
* @fshared: false for a PROCESS_PRIVATE futex, true for PROCESS_SHARED
* @flags: FLAGS_*
* @key: address where result is stored.
* @rw: mapping needs to be read/write (values: FUTEX_READ,
* FUTEX_WRITE)
@ -217,7 +217,7 @@ static u64 get_inode_sequence_number(struct inode *inode)
*
* lock_page() might sleep, the caller should not hold a spinlock.
*/
int get_futex_key(u32 __user *uaddr, bool fshared, union futex_key *key,
int get_futex_key(u32 __user *uaddr, unsigned int flags, union futex_key *key,
enum futex_access rw)
{
unsigned long address = (unsigned long)uaddr;
@ -226,6 +226,9 @@ int get_futex_key(u32 __user *uaddr, bool fshared, union futex_key *key,
struct folio *folio;
struct address_space *mapping;
int err, ro = 0;
bool fshared;
fshared = flags & FLAGS_SHARED;
/*
* The futex address must be "naturally" aligned.

2
kernel/futex/futex.h
View File

@ -184,7 +184,7 @@ enum futex_access {
FUTEX_WRITE
};
extern int get_futex_key(u32 __user *uaddr, bool fshared, union futex_key *key,
extern int get_futex_key(u32 __user *uaddr, unsigned int flags, union futex_key *key,
enum futex_access rw);
extern struct hrtimer_sleeper *

4
kernel/futex/pi.c
View File

@ -933,7 +933,7 @@ int futex_lock_pi(u32 __user *uaddr, unsigned int flags, ktime_t *time, int tryl
to = futex_setup_timer(time, &timeout, flags, 0);
retry:
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &q.key, FUTEX_WRITE);
ret = get_futex_key(uaddr, flags, &q.key, FUTEX_WRITE);
if (unlikely(ret != 0))
goto out;
@ -1129,7 +1129,7 @@ int futex_unlock_pi(u32 __user *uaddr, unsigned int flags)
if ((uval & FUTEX_TID_MASK) != vpid)
return -EPERM;
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &key, FUTEX_WRITE);
ret = get_futex_key(uaddr, flags, &key, FUTEX_WRITE);
if (ret)
return ret;

6
kernel/futex/requeue.c
View File

@ -424,10 +424,10 @@ int futex_requeue(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2,
}
retry:
ret = get_futex_key(uaddr1, flags & FLAGS_SHARED, &key1, FUTEX_READ);
ret = get_futex_key(uaddr1, flags, &key1, FUTEX_READ);
if (unlikely(ret != 0))
return ret;
ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2,
ret = get_futex_key(uaddr2, flags, &key2,
requeue_pi ? FUTEX_WRITE : FUTEX_READ);
if (unlikely(ret != 0))
return ret;
@ -789,7 +789,7 @@ int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
*/
rt_mutex_init_waiter(&rt_waiter);
ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, FUTEX_WRITE);
ret = get_futex_key(uaddr2, flags, &key2, FUTEX_WRITE);
if (unlikely(ret != 0))
goto out;

14
kernel/futex/waitwake.c
View File

@ -145,13 +145,13 @@ int futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
struct futex_hash_bucket *hb;
struct futex_q *this, *next;
union futex_key key = FUTEX_KEY_INIT;
int ret;
DEFINE_WAKE_Q(wake_q);
int ret;
if (!bitset)
return -EINVAL;
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &key, FUTEX_READ);
ret = get_futex_key(uaddr, flags, &key, FUTEX_READ);
if (unlikely(ret != 0))
return ret;
@ -248,10 +248,10 @@ int futex_wake_op(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2,
DEFINE_WAKE_Q(wake_q);
retry:
ret = get_futex_key(uaddr1, flags & FLAGS_SHARED, &key1, FUTEX_READ);
ret = get_futex_key(uaddr1, flags, &key1, FUTEX_READ);
if (unlikely(ret != 0))
return ret;
ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, FUTEX_WRITE);
ret = get_futex_key(uaddr2, flags, &key2, FUTEX_WRITE);
if (unlikely(ret != 0))
return ret;
@ -426,7 +426,7 @@ static int futex_wait_multiple_setup(struct futex_vector *vs, int count, int *wo
continue;
ret = get_futex_key(u64_to_user_ptr(vs[i].w.uaddr),
vs[i].w.flags & FLAGS_SHARED,
vs[i].w.flags,
&vs[i].q.key, FUTEX_READ);
if (unlikely(ret))
@ -438,7 +438,7 @@ static int futex_wait_multiple_setup(struct futex_vector *vs, int count, int *wo
for (i = 0; i < count; i++) {
u32 __user *uaddr = (u32 __user *)(unsigned long)vs[i].w.uaddr;
struct futex_q *q = &vs[i].q;
u32 val = (u32)vs[i].w.val;
u32 val = vs[i].w.val;
hb = futex_q_lock(q);
ret = futex_get_value_locked(&uval, uaddr);
@ -602,7 +602,7 @@ int futex_wait_setup(u32 __user *uaddr, u32 val, unsigned int flags,
* while the syscall executes.
*/
retry:
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &q->key, FUTEX_READ);
ret = get_futex_key(uaddr, flags, &q->key, FUTEX_READ);
if (unlikely(ret != 0))
return ret;