region

Name:Examine the existing reserve map and determine how many* huge pages in the specified range [f, t) are NOT currently* represented. This routine is called before a subsequent* call to region_add that will actually modify the reserve

Proto:static long region_chg(struct resv_map *resv, long f, long t)

Type:long

Parameter:

Type	Parameter	Name
struct resv_map *	resv
long	f
long	t

372

chg = 0

374

spin_lock( & lock)

375

retry_locked :

376

adds_in_progress++

382

If adds_in_progress > region_cache_count Then

385

VM_BUG_ON(adds_in_progress - region_cache_count > 1)

387

adds_in_progress--

388

spin_unlock( & lock)

390

trg = kmalloc( size of trg , GFP_KERNEL)

391

If Not trg Then Return -ENOMEM

394

spin_lock( & lock)

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list_add - add a new entry*@new: new entry to be added*@head: list head to add it after* Insert a new entry after the specified head.* This is good for implementing stacks.

396

region_cache_count++

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Go to retry_locked

400

chg = Must be called with resv->lock held. Calling this with count_only == true* will count the number of pages to be added but will not modify the linked* list.

402

spin_unlock( & lock)

403

Return chg

**Caller**
Name	Describe
__vma_reservation_common
hugetlb_reserve_pages

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Function report