[PATCH v5 11/14] software node: move small properties inline when copying

Dmitry Torokhov
2019-10-11T23:08:02Z

When copying/duplicating set of properties, move smaller properties that
were stored separately directly inside property entry structures. We can
move:

- up to 8 bytes from U8 arrays
- up to 4 words
- up to 2 double words
- one U64 value
- one or 2 strings.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
drivers/base/swnode.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index ae4b24ee2a54..546fc1b20095 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -277,6 +277,16 @@ static int property_entry_copy_data(struct property_entry *dst,
dst->value = src->value;
}

+ if (!dst->is_inline && dst->length <= sizeof(dst->value)) {
+ /* We have an opportunity to move the data inline */
+ const void *tmp = dst->pointer;
+
+ memcpy(&dst->value, tmp, dst->length);
+ dst->is_inline = true;
+
+ kfree(tmp);
+ }
+
dst->length = src->length;
dst->type = src->type;
dst->name = kstrdup(src->name, GFP_KERNEL);
--
2.23.0.700.g56cf767bdb-goog