AcoSail/kernel_optimize_test
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of: overlay: expand check of whether overlay changeset can be removed

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The test of whether it is safe to remove an overlay changeset
looked at whether any node in the overlay changeset was in a
subtree rooted at any more recently applied overlay changeset
node.

The test failed to determine whether any node in the overlay
changeset was the root of a subtree that contained a more
recently applied overlay changeset node.  Add this additional
check to the test.

The test is still lacking any check for any phandle dependencies.

Signed-off-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Frank Rowand 2017-10-17 16:36:27 -07:00 committed by Rob Herring
parent 24789c5ce5
commit 87f242c119
1 changed files with 13 additions and 7 deletions
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20
drivers/of/overlay.c
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@ -707,13 +707,13 @@ static int find_node(struct device_node *tree, struct device_node *np)
}
/*
* Is @remove_ce_np a child of or the same as any
* Is @remove_ce_node a child of, a parent of, or the same as any
* node in an overlay changeset more topmost than @remove_ovcs?
*
* Returns 1 if found, else 0
*/
static int node_in_later_cs(struct overlay_changeset *remove_ovcs,
struct device_node *remove_ce_np)
static int node_overlaps_later_cs(struct overlay_changeset *remove_ovcs,
struct device_node *remove_ce_node)
{
struct overlay_changeset *ovcs;
struct of_changeset_entry *ce;
@ -723,10 +723,16 @@ static int node_in_later_cs(struct overlay_changeset *remove_ovcs,
break;
list_for_each_entry(ce, &ovcs->cset.entries, node) {
if (find_node(ce->np, remove_ce_np)) {
pr_err("%s: #%d clashes #%d @%pOF\n",
if (find_node(ce->np, remove_ce_node)) {
pr_err("%s: #%d overlaps with #%d @%pOF\n",
__func__, remove_ovcs->id, ovcs->id,
remove_ce_np);
remove_ce_node);
return 1;
}
if (find_node(remove_ce_node, ce->np)) {
pr_err("%s: #%d overlaps with #%d @%pOF\n",
__func__, remove_ovcs->id, ovcs->id,
remove_ce_node);
return 1;
}
}
@ -750,7 +756,7 @@ static int overlay_removal_is_ok(struct overlay_changeset *remove_ovcs)
struct of_changeset_entry *remove_ce;
list_for_each_entry(remove_ce, &remove_ovcs->cset.entries, node) {
if (node_in_later_cs(remove_ovcs, remove_ce->np)) {
if (node_overlaps_later_cs(remove_ovcs, remove_ce->np)) {
pr_err("overlay #%d is not topmost\n", remove_ovcs->id);
return 0;
}