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ipc/util: drop ipc_rcu_alloc()

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No callers remain for ipc_rcu_alloc().  Drop the function.

[manfred@colorfullife.com: Rediff because the memset was temporarily inside ipc_rcu_free()]
Link: http://lkml.kernel.org/r/20170525185107.12869-13-manfred@colorfullife.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kees Cook 2017-07-12 14:35:10 -07:00 committed by Linus Torvalds
parent 52f908904e
commit c3f6fb6fe4
2 changed files with 0 additions and 24 deletions
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21
ipc/util.c
View file

@ -394,27 +394,6 @@ void ipc_rmid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp)
ipcp->deleted = true;
}
/**
* ipc_rcu_alloc - allocate ipc space
* @size: size desired
*
* Allocate memory for an ipc object.
* The first member must be struct kern_ipc_perm.
*/
struct kern_ipc_perm *ipc_rcu_alloc(int size)
{
/*
* We prepend the allocation with the rcu struct
*/
struct kern_ipc_perm *out = kvmalloc(size, GFP_KERNEL);
if (unlikely(!out))
return NULL;
memset(out, 0, size);
atomic_set(&out->refcount, 1);
return out;
}
int ipc_rcu_getref(struct kern_ipc_perm *ptr)
{
return atomic_inc_not_zero(&ptr->refcount);

3
ipc/util.h
View file

@ -112,10 +112,7 @@ int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flg);
* Objects are reference counted, they start with reference count 1.
* getref increases the refcount, the putref call that reduces the recount
* to 0 schedules the rcu destruction. Caller must guarantee locking.
*
* struct kern_ipc_perm must be the first member in the allocated structure.
*/
struct kern_ipc_perm *ipc_rcu_alloc(int size);
int ipc_rcu_getref(struct kern_ipc_perm *ptr);
void ipc_rcu_putref(struct kern_ipc_perm *ptr,
void (*func)(struct rcu_head *head));