From 23fa18eaa71266feff7ba8d83022d9e1cc83c65a Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:42:03 +0000
Subject: [PATCH] disable pwm7
---
kernel/drivers/xen/xenbus/xenbus_probe_backend.c | 41 +++++++++++++++++++++++++++++++++++++++--
1 files changed, 39 insertions(+), 2 deletions(-)
diff --git a/kernel/drivers/xen/xenbus/xenbus_probe_backend.c b/kernel/drivers/xen/xenbus/xenbus_probe_backend.c
index 4bb6030..5abded9 100644
--- a/kernel/drivers/xen/xenbus/xenbus_probe_backend.c
+++ b/kernel/drivers/xen/xenbus/xenbus_probe_backend.c
@@ -45,9 +45,9 @@
#include <linux/mm.h>
#include <linux/notifier.h>
#include <linux/export.h>
+#include <linux/semaphore.h>
#include <asm/page.h>
-#include <asm/pgtable.h>
#include <asm/xen/hypervisor.h>
#include <asm/hypervisor.h>
#include <xen/xenbus.h>
@@ -205,7 +205,6 @@
.uevent = xenbus_uevent_backend,
.probe = xenbus_dev_probe,
.remove = xenbus_dev_remove,
- .shutdown = xenbus_dev_shutdown,
.dev_groups = xenbus_dev_groups,
},
};
@@ -255,6 +254,41 @@
return NOTIFY_DONE;
}
+static int backend_reclaim_memory(struct device *dev, void *data)
+{
+ const struct xenbus_driver *drv;
+ struct xenbus_device *xdev;
+
+ if (!dev->driver)
+ return 0;
+ drv = to_xenbus_driver(dev->driver);
+ if (drv && drv->reclaim_memory) {
+ xdev = to_xenbus_device(dev);
+ if (down_trylock(&xdev->reclaim_sem))
+ return 0;
+ drv->reclaim_memory(xdev);
+ up(&xdev->reclaim_sem);
+ }
+ return 0;
+}
+
+/*
+ * Returns 0 always because we are using shrinker to only detect memory
+ * pressure.
+ */
+static unsigned long backend_shrink_memory_count(struct shrinker *shrinker,
+ struct shrink_control *sc)
+{
+ bus_for_each_dev(&xenbus_backend.bus, NULL, NULL,
+ backend_reclaim_memory);
+ return 0;
+}
+
+static struct shrinker backend_memory_shrinker = {
+ .count_objects = backend_shrink_memory_count,
+ .seeks = DEFAULT_SEEKS,
+};
+
static int __init xenbus_probe_backend_init(void)
{
static struct notifier_block xenstore_notifier = {
@@ -271,6 +305,9 @@
register_xenstore_notifier(&xenstore_notifier);
+ if (register_shrinker(&backend_memory_shrinker))
+ pr_warn("shrinker registration failed\n");
+
return 0;
}
subsys_initcall(xenbus_probe_backend_init);
--
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