Re: [PATCH] drm/amdkfd: make kfd_class constant

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On 2024-03-05 7:15, Ricardo B. Marliere wrote:
Since commit 43a7206b0963 ("driver core: class: make class_register() take
a const *"), the driver core allows for struct class to be in read-only
memory, so move the kfd_class structure to be declared at build time
placing it into read-only memory, instead of having to be dynamically
allocated at boot time.

Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ricardo B. Marliere <ricardo@xxxxxxxxxxxx>

The patch looks good to me. Do you want me to apply this to Alex's amd-staging-drm-next?

Reviewed-by: Felix Kuehling <felix.kuehling@xxxxxxx>


---
  drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 21 +++++++++++----------
  1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index f030cafc5a0a..dfa8c69532d4 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -63,8 +63,10 @@ static const struct file_operations kfd_fops = {
  };
static int kfd_char_dev_major = -1;
-static struct class *kfd_class;
  struct device *kfd_device;
+static const struct class kfd_class = {
+	.name = kfd_dev_name,
+};
static inline struct kfd_process_device *kfd_lock_pdd_by_id(struct kfd_process *p, __u32 gpu_id)
  {
@@ -94,14 +96,13 @@ int kfd_chardev_init(void)
  	if (err < 0)
  		goto err_register_chrdev;
- kfd_class = class_create(kfd_dev_name);
-	err = PTR_ERR(kfd_class);
-	if (IS_ERR(kfd_class))
+	err = class_register(&kfd_class);
+	if (err)
  		goto err_class_create;
- kfd_device = device_create(kfd_class, NULL,
-					MKDEV(kfd_char_dev_major, 0),
-					NULL, kfd_dev_name);
+	kfd_device = device_create(&kfd_class, NULL,
+				   MKDEV(kfd_char_dev_major, 0),
+				   NULL, kfd_dev_name);
  	err = PTR_ERR(kfd_device);
  	if (IS_ERR(kfd_device))
  		goto err_device_create;
@@ -109,7 +110,7 @@ int kfd_chardev_init(void)
  	return 0;
err_device_create:
-	class_destroy(kfd_class);
+	class_unregister(&kfd_class);
  err_class_create:
  	unregister_chrdev(kfd_char_dev_major, kfd_dev_name);
  err_register_chrdev:
@@ -118,8 +119,8 @@ int kfd_chardev_init(void)
void kfd_chardev_exit(void)
  {
-	device_destroy(kfd_class, MKDEV(kfd_char_dev_major, 0));
-	class_destroy(kfd_class);
+	device_destroy(&kfd_class, MKDEV(kfd_char_dev_major, 0));
+	class_unregister(&kfd_class);
  	unregister_chrdev(kfd_char_dev_major, kfd_dev_name);
  	kfd_device = NULL;
  }

---
base-commit: 8bc75586ea01f1c645063d3472c115ecab03e76c
change-id: 20240305-class_cleanup-drm-amd-bdc7255b7540

Best regards,



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