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idr: make idr_get_new* rcu-safe

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Make the idr_get_new* routines rcu-safe.

Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net>
Reviewed-by: "Paul E. McKenney" <paulmck@us.ibm.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: Jim Houston <jim.houston@comcast.net>
Cc: Pierre Peiffer <peifferp@gmail.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nadia Derbey 2008-07-25 01:48:00 -07:00 committed by Linus Torvalds
parent 944ca05c7b
commit 3219b3b745
1 changed files with 9 additions and 5 deletions
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14
lib/idr.c
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@ -6,6 +6,8 @@
* Modified by George Anzinger to reuse immediately and to use
* find bit instructions. Also removed _irq on spinlocks.
*
* Modified by Nadia Derbey to make it RCU safe.
*
* Small id to pointer translation service.
*
* It uses a radix tree like structure as a sparse array indexed
@ -96,7 +98,7 @@ static void idr_mark_full(struct idr_layer **pa, int id)
* @gfp_mask: memory allocation flags
*
* This function should be called prior to locking and calling the
* following function. It preallocates enough memory to satisfy
* idr_get_new* functions. It preallocates enough memory to satisfy
* the worst possible allocation.
*
* If the system is REALLY out of memory this function returns 0,
@ -170,7 +172,7 @@ static int sub_alloc(struct idr *idp, int *starting_id, struct idr_layer **pa)
new = get_from_free_list(idp);
if (!new)
return -1;
p->ary[m] = new;
rcu_assign_pointer(p->ary[m], new);
p->count++;
}
pa[l--] = p;
@ -226,7 +228,7 @@ build_up:
__set_bit(0, &new->bitmap);
p = new;
}
idp->top = p;
rcu_assign_pointer(idp->top, p);
idp->layers = layers;
v = sub_alloc(idp, &id, pa);
if (v == IDR_NEED_TO_GROW)
@ -245,7 +247,8 @@ static int idr_get_new_above_int(struct idr *idp, void *ptr, int starting_id)
* Successfully found an empty slot. Install the user
* pointer and mark the slot full.
*/
pa[0]->ary[id & IDR_MASK] = (struct idr_layer *)ptr;
rcu_assign_pointer(pa[0]->ary[id & IDR_MASK],
(struct idr_layer *)ptr);
pa[0]->count++;
idr_mark_full(pa, id);
}
@ -710,7 +713,8 @@ int ida_get_new_above(struct ida *ida, int starting_id, int *p_id)
return -EAGAIN;
memset(bitmap, 0, sizeof(struct ida_bitmap));
pa[0]->ary[idr_id & IDR_MASK] = (void *)bitmap;
rcu_assign_pointer(pa[0]->ary[idr_id & IDR_MASK],
(void *)bitmap);
pa[0]->count++;
}