xol_free_insn_slot

Name:xol_free_insn_slot - If slot was earlier allocated by*@xol_get_insn_slot(), make the slot available for* subsequent requests.

Proto:static void xol_free_insn_slot(struct task_struct *tsk)

Type:void

Parameter:

Type	Parameter	Name
struct task_struct *	tsk

1642

If Not mm || Not xol_area || Not utask Then Return

1645

slot_addr = xol_vaddr

1646

If Value for the false possibility is greater at compile time(!slot_addr) Then Return

1649

area = xol_area

1650

vma_end = Page(s) of instruction slots + PAGE_SIZE

1651

If Page(s) of instruction slots <= slot_addr && slot_addr < vma_end Then

1655

offset = slot_addr - Page(s) of instruction slots

1656

slot_nr = offset / keep it cache aligned

1657

If slot_nr >= UINSNS_PER_PAGE Then Return

1660

lear_bit - Clears a bit in memory*@nr: Bit to clear*@addr: Address to start counting from* This is a relaxed atomic operation (no implied memory barriers).

1661

atomic_dec( & umber of in-use slots )

1662

smp_mb__after_atomic()

1663

If waitqueue_active -- locklessly test for waiters on the queue*@wq_head: the waitqueue to test for waiters* returns true if the wait list is not empty* NOTE: this function is lockless and requires care, incorrect usage _will_ Then wake_up( & all slots are busy )

1666

**Caller**
Name	Describe
uprobe_free_utask	Called with no locks held.* Called in context of an exiting or an exec-ing thread.
pre_ssout	Prepare to single-step probed instruction out of line.
handle_singlestep	Perform required fix-ups and disable singlestep.* Allow pending signals to take effect.

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