GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-20 21:51:05 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

xarray: Destroy an XArray

Browse source 
This function frees all the internal memory allocated to the xarray
and reinitialises it to be empty.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox 2017-11-17 08:16:34 -05:00
parent 80a0a1a9a3
commit 687149fca1
3 changed files with 63 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

28
lib/xarray.c
View file

@ -1524,6 +1524,34 @@ unsigned int xa_extract(struct xarray *xa, void **dst, unsigned long start,
}
EXPORT_SYMBOL(xa_extract);
/**
* xa_destroy() - Free all internal data structures.
* @xa: XArray.
*
* After calling this function, the XArray is empty and has freed all memory
* allocated for its internal data structures. You are responsible for
* freeing the objects referenced by the XArray.
*
* Context: Any context. Takes and releases the xa_lock, interrupt-safe.
*/
void xa_destroy(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
unsigned long flags;
void *entry;
xas.xa_node = NULL;
xas_lock_irqsave(&xas, flags);
entry = xa_head_locked(xa);
RCU_INIT_POINTER(xa->xa_head, NULL);
xas_init_marks(&xas);
/* lockdep checks we're still holding the lock in xas_free_nodes() */
if (xa_is_node(entry))
xas_free_nodes(&xas, xa_to_node(entry));
xas_unlock_irqrestore(&xas, flags);
}
EXPORT_SYMBOL(xa_destroy);
#ifdef XA_DEBUG
void xa_dump_node(const struct xa_node *node)
{