HID: bpf: fix gcc warning and unify __u64 into u64

I've got multiple reports of:
error: cast from pointer to integer of different size
[-Werror=pointer-to-int-cast].

Let's use the same trick than kernel/bpf/helpers.c to shut up that warning.

Even if we were on an architecture with addresses on more than 64 bits,
this isn't much of an issue as the address is not used as a pointer,
but as an hash and the caller is not supposed to go back to the kernel
address ever.

And while we change those, make sure we use u64 instead of __u64 for
consistency

Reported-by: Stephen Rothwell <[e-mail]>
Reported-by: kernel test robot <[e-mail]>
Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]/
Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]/
Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]/
Reported-by: Mirsad Todorovac <[e-mail]>
Fixes: 67eccf151d76 ("HID: add source argument to HID low level functions")
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Benjamin Tissoires <[e-mail]>

drivers/hid/bpf/hid_bpf_dispatch.c

···
 					      size,
 					      rtype,
 					      reqtype,
-					      (__u64)ctx,
+					      (u64)(long)ctx,
 					      true); /* prevent infinite recursions */
 
 	if (ret > 0)
···
 	if (!dma_data)
 		return -ENOMEM;
 
-	ret = hid_ops->hid_hw_output_report(hdev, dma_data, size, (__u64)ctx, true);
+	ret = hid_ops->hid_hw_output_report(hdev, dma_data, size, (u64)(long)ctx, true);
 
 	kfree(dma_data);
 	return ret;
···
 	if (ret)
 		return ret;
 
-	return hid_ops->hid_input_report(ctx->hid, type, buf, size, 0, (__u64)ctx, true,
+	return hid_ops->hid_input_report(ctx->hid, type, buf, size, 0, (u64)(long)ctx, true,
 					 lock_already_taken);
 }
 

drivers/hid/bpf/hid_bpf_struct_ops.c

···
 	hid_put_device(hdev);
 }
 
-static int __hid_bpf_device_event(struct hid_bpf_ctx *ctx, enum hid_report_type type, __u64 source)
+static int __hid_bpf_device_event(struct hid_bpf_ctx *ctx, enum hid_report_type type, u64 source)
 {
 	return 0;
 }

drivers/hid/hid-core.c

···
 			 unsigned char reportnum, __u8 *buf,
 			 size_t len, enum hid_report_type rtype,
 			 enum hid_class_request reqtype,
-			 __u64 source, bool from_bpf)
+			 u64 source, bool from_bpf)
 {
 	unsigned int max_buffer_size = HID_MAX_BUFFER_SIZE;
 	int ret;
···
 }
 EXPORT_SYMBOL_GPL(hid_hw_raw_request);
 
-int __hid_hw_output_report(struct hid_device *hdev, __u8 *buf, size_t len, __u64 source,
+int __hid_hw_output_report(struct hid_device *hdev, __u8 *buf, size_t len, u64 source,
 			   bool from_bpf)
 {
 	unsigned int max_buffer_size = HID_MAX_BUFFER_SIZE;

drivers/hid/hidraw.c

···
 
 	if ((report_type == HID_OUTPUT_REPORT) &&
 	    !(dev->quirks & HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP)) {
-		ret = __hid_hw_output_report(dev, buf, count, (__u64)file, false);
+		ret = __hid_hw_output_report(dev, buf, count, (u64)(long)file, false);
 		/*
 		 * compatibility with old implementation of USB-HID and I2C-HID:
 		 * if the device does not support receiving output reports,
···
 	}
 
 	ret = __hid_hw_raw_request(dev, buf[0], buf, count, report_type,
-				   HID_REQ_SET_REPORT, (__u64)file, false);
+				   HID_REQ_SET_REPORT, (u64)(long)file, false);
 
 out_free:
 	kfree(buf);
···
 	}
 
 	ret = __hid_hw_raw_request(dev, report_number, buf, count, report_type,
-				   HID_REQ_GET_REPORT, (__u64)file, false);
+				   HID_REQ_GET_REPORT, (u64)(long)file, false);
 
 	if (ret < 0)
 		goto out_free;

include/linux/hid_bpf.h

···
 				  unsigned char reportnum, __u8 *buf,
 				  size_t len, enum hid_report_type rtype,
 				  enum hid_class_request reqtype,
-				  __u64 source, bool from_bpf);
+				  u64 source, bool from_bpf);
 	int (*hid_hw_output_report)(struct hid_device *hdev, __u8 *buf, size_t len,
-				    __u64 source, bool from_bpf);
+				    u64 source, bool from_bpf);
 	int (*hid_input_report)(struct hid_device *hid, enum hid_report_type type,
 				u8 *data, u32 size, int interrupt, u64 source, bool from_bpf,
 				bool lock_already_taken);
···
 	 * Context: Interrupt context.
 	 */
 	int (*hid_device_event)(struct hid_bpf_ctx *ctx, enum hid_report_type report_type,
-				__u64 source);
+				u64 source);
 
 	/**
 	 * @hid_rdesc_fixup: called when the probe function parses the report descriptor