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ucount: Remove the atomicity from ucount->count

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am: ee6f7ee1e4

Change-Id: I222bf26458f918b2481e0c14ce2b0bf5fd3c85d8
This commit is contained in:
Eric W. Biederman
2017-03-18 11:33:08 +00:00
committed by android-build-merger
parent 86791b193d ee6f7ee1e4
commit 4ee06d54ee
2 changed files with 12 additions and 8 deletions
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2
include/linux/user_namespace.h
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@@ -65,7 +65,7 @@ struct ucounts {
struct hlist_node node;
struct user_namespace *ns;
kuid_t uid;
atomic_t count;
int count;
atomic_t ucount[UCOUNT_COUNTS];
};

18
kernel/ucount.c
View File

@@ -139,7 +139,7 @@ static struct ucounts *get_ucounts(struct user_namespace *ns, kuid_t uid)
new->ns = ns;
new->uid = uid;
atomic_set(&new->count, 0);
new->count = 0;
spin_lock_irq(&ucounts_lock);
ucounts = find_ucounts(ns, uid, hashent);
@@ -150,8 +150,10 @@ static struct ucounts *get_ucounts(struct user_namespace *ns, kuid_t uid)
ucounts = new;
}
}
if (!atomic_add_unless(&ucounts->count, 1, INT_MAX))
if (ucounts->count == INT_MAX)
ucounts = NULL;
else
ucounts->count += 1;
spin_unlock_irq(&ucounts_lock);
return ucounts;
}
@@ -160,13 +162,15 @@ static void put_ucounts(struct ucounts *ucounts)
{
unsigned long flags;
if (atomic_dec_and_test(&ucounts->count)) {
spin_lock_irqsave(&ucounts_lock, flags);
spin_lock_irqsave(&ucounts_lock, flags);
ucounts->count -= 1;
if (!ucounts->count)
hlist_del_init(&ucounts->node);
spin_unlock_irqrestore(&ucounts_lock, flags);
else
ucounts = NULL;
spin_unlock_irqrestore(&ucounts_lock, flags);
kfree(ucounts);
}
kfree(ucounts);
}
static inline bool atomic_inc_below(atomic_t *v, int u)