Commit f742267a authored Jul 30, 2018 by Huaisheng Ye Committed by Dave Jiang Jul 30, 2018

md/dm-writecache: Don't request pointer dummy_addr when not required



Function persistent_memory_claim doesn't need to get local pointer
dummy_addr from direct_access. Using NULL instead of having to pass
in a useless local pointer that caller then just throw away.

Suggested-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Huaisheng Ye <yehs1@lenovo.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

parent e0b401e3

drivers/md/dm-writecache.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -267,9 +267,8 @@ static int persistent_memory_claim(struct dm_writecache *wc)
		i = 0;
		do {
		long daa;
		void *dummy_addr;
		daa = dax_direct_access(wc->ssd_dev->dax_dev, i, p - i,
		&dummy_addr, &pfn);
		NULL, &pfn);
		if (daa <= 0) {
		r = daa ? daa : -EINVAL;
		goto err3;