On Tue 16-07-19 20:39:46, Dan Williams wrote:
On Fri, Jul 12, 2019 at 2:14 AM Jan Kara jack@suse.cz wrote:
On Thu 11-07-19 08:25:50, Matthew Wilcox wrote:
On Thu, Jul 11, 2019 at 07:13:50AM -0700, Matthew Wilcox wrote:
However, the XA_RETRY_ENTRY might be a good choice. It doesn't normally appear in an XArray (it may appear if you're looking at a deleted node, but since we're holding the lock, we can't see deleted nodes).
...
@@ -254,7 +267,7 @@ static void wait_entry_unlocked(struct xa_state *xas, void *entry) static void put_unlocked_entry(struct xa_state *xas, void *entry) { /* If we were the only waiter woken, wake the next one */
if (entry)
if (entry && dax_is_conflict(entry))This should be !dax_is_conflict(entry)...
dax_wake_entry(xas, entry, false);}
Otherwise the patch looks good to me so feel free to add:
Reviewed-by: Jan Kara jack@suse.cz
Looks good, and passes the test case. Now pushed out to libnvdimm-for-next for v5.3 inclusion:
https://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm.git/commit/?h=...
Thanks for picking up the patch but you didn't apply the fix I've mentioned above. So put_unlocked_entry() is not waking up anybody anymore... Since this got already to Linus' tree, I guess a separate fixup patch is needed (attached).
Honza