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lib/idr.c: use RCU_INIT_POINTER(x, NULL) 

Replace rcu_assign_pointer(x, NULL) with RCU_INIT_POINTER(x, NULL)

The rcu_assign_pointer() ensures that the initialization of a structure
is carried out before storing a pointer to that structure.  And in the
case of the NULL pointer, there is no structure to initialize.

So, rcu_assign_pointer(p, NULL) can be safely converted to
RCU_INIT_POINTER(p, NULL)

Signed-off-by: Monam Agarwal <monamagarwal123@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Monam Agarwal 2014-04-07 15:38:54 -07:00 committed by Linus Torvalds
parent 90ae3ae539
commit 3f59b067c5
1 changed files with 2 additions and 2 deletions
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4
lib/idr.c
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@ -533,7 +533,7 @@ static void sub_remove(struct idr *idp, int shift, int id)
n = id & IDR_MASK; n = id & IDR_MASK;
if (likely(p != NULL && test_bit(n, p->bitmap))) { if (likely(p != NULL && test_bit(n, p->bitmap))) {
__clear_bit(n, p->bitmap); __clear_bit(n, p->bitmap);
rcu_assign_pointer(p->ary[n], NULL); RCU_INIT_POINTER(p->ary[n], NULL);
to_free = NULL; to_free = NULL;
while(*paa && ! --((**paa)->count)){ while(*paa && ! --((**paa)->count)){
if (to_free) if (to_free)
@ -602,7 +602,7 @@ static void __idr_remove_all(struct idr *idp)
n = idp->layers * IDR_BITS; n = idp->layers * IDR_BITS;
p = idp->top; p = idp->top;
rcu_assign_pointer(idp->top, NULL); RCU_INIT_POINTER(idp->top, NULL);
max = idr_max(idp->layers); max = idr_max(idp->layers);
id = 0; id = 0;