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Message-ID: <20240925154355.1170859-2-andriy.shevchenko@linux.intel.com>
Date: Wed, 25 Sep 2024 18:43:34 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: linux-kernel@...r.kernel.org
Cc: Andy Shevchenko <andy@...nel.org>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/2] resource: Replace open coded resource_intersection()
The __region_intersects() uses open coded resource_intersection().
Replace it with existing API which also make more clear what we
are checking.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
kernel/resource.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)
diff --git a/kernel/resource.c b/kernel/resource.c
index b730bd28b422..6880c0e283dd 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -539,17 +539,16 @@ static int __region_intersects(struct resource *parent, resource_size_t start,
size_t size, unsigned long flags,
unsigned long desc)
{
- resource_size_t ostart, oend;
int type = 0; int other = 0;
struct resource *p, *dp;
+ struct resource res, o;
bool is_type, covered;
- struct resource res;
res.start = start;
res.end = start + size - 1;
for (p = parent->child; p ; p = p->sibling) {
- if (!resource_overlaps(p, &res))
+ if (!resource_intersection(p, &res, &o))
continue;
is_type = (p->flags & flags) == flags &&
(desc == IORES_DESC_NONE || desc == p->desc);
@@ -570,8 +569,6 @@ static int __region_intersects(struct resource *parent, resource_size_t start,
* |-- "System RAM" --||-- "CXL Window 0a" --|
*/
covered = false;
- ostart = max(res.start, p->start);
- oend = min(res.end, p->end);
for_each_resource(p, dp, false) {
if (!resource_overlaps(dp, &res))
continue;
@@ -580,17 +577,17 @@ static int __region_intersects(struct resource *parent, resource_size_t start,
if (is_type) {
type++;
/*
- * Range from 'ostart' to 'dp->start'
+ * Range from 'o.start' to 'dp->start'
* isn't covered by matched resource.
*/
- if (dp->start > ostart)
+ if (dp->start > o.start)
break;
- if (dp->end >= oend) {
+ if (dp->end >= o.end) {
covered = true;
break;
}
/* Remove covered range */
- ostart = max(ostart, dp->end + 1);
+ o.start = max(o.start, dp->end + 1);
}
}
if (!covered)
--
2.43.0.rc1.1336.g36b5255a03ac
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