software node: allow embedding of small arrays into property_entry

Browse source

We should not conflate whether a property data is an array or a single
value with where it is stored (embedded into property_entry structure or
out-of-line). All single-value properties are in effect 1-element
arrays, and we can figure the amount of data stored in a property by
examining its length and the data type. And arrays can be as easily
stored in property entry instances as single values are, provided that
we have enough space (we have up to 8 bytes). We can embed:

 - up to 8 bytes from U8 arrays
 - up to 4 words
 - up to 2 double words
 - one U64 value
 - one (on 64 bit architectures) or 2 (on 32 bit) strings.

This change also has an effect of switching properties with small amount
of data to embed it instead of keeping it separate when copying such
properties.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

...

This commit is contained in:

Dmitry Torokhov 2019-11-07 20:22:21 -08:00 • committed by Rafael J. Wysocki

parent e6bff4665c

commit 996b0830f9

2 changed files with 62 additions and 67 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

113

drivers/base/swnode.c

View file

14

include/linux/property.h

View file