allocate_resource() accepts ->alignf() callback to perform custom
alignment beyond constraint->align. If alignf is NULL,
simple_align_resource() is used which only returns avail->start (no
change).
Using avail->start directly is natural and can be done with a
conditional in __find_resource_space() instead which avoids
unnecessarily using callback. It makes the code inside
__find_resource_space() more obvious and removes the need for the
caller to provide constraint->alignf unnecessarily.
This is preparation for exporting find_resource_space().
Tested-by: Lidong Wang <lidong.wang@xxxxxxxxx>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
---
kernel/resource.c | 20 +++++++-------------
1 file changed, 7 insertions(+), 13 deletions(-)
diff --git a/kernel/resource.c b/kernel/resource.c
index 26ad6f223652..35c44c23b037 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -621,14 +621,6 @@ void __weak arch_remove_reservations(struct resource *avail)
{
}
-static resource_size_t simple_align_resource(void *data,
- const struct resource *avail,
- resource_size_t size,
- resource_size_t align)
-{
- return avail->start;
-}
-
static void resource_clip(struct resource *res, resource_size_t min,
resource_size_t max)
{
@@ -648,6 +640,7 @@ static int __find_resource_space(struct resource *root, struct resource *old,
{
struct resource *this = root->child;
struct resource tmp = *new, avail, alloc;
+ resource_alignf alignf = constraint->alignf;
tmp.start = root->start;
/*
@@ -676,8 +669,12 @@ static int __find_resource_space(struct resource *root, struct resource *old,
avail.flags = new->flags & ~IORESOURCE_UNSET;
if (avail.start >= tmp.start) {
alloc.flags = avail.flags;
- alloc.start = constraint->alignf(constraint->alignf_data, &avail,
- size, constraint->align);
+ if (alignf) {
+ alloc.start = alignf(constraint->alignf_data,
+ &avail, size, constraint->align);
+ } else {
+ alloc.start = avail.start;
+ }
alloc.end = alloc.start + size - 1;
if (alloc.start <= alloc.end &&
resource_contains(&avail, &alloc)) {
@@ -788,9 +785,6 @@ int allocate_resource(struct resource *root, struct resource *new,
int err;
struct resource_constraint constraint;
- if (!alignf)
- alignf = simple_align_resource;
-
constraint.min = min;
constraint.max = max;
constraint.align = align;
--
2.39.2
