linux-kernel - [for-next][PATCH 12/25] tracing/user_events: Split header into uapi and kernel

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Message-ID: <20230329194551.451527297@goodmis.org>
Date:   Wed, 29 Mar 2023 15:45:28 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Beau Belgrave <beaub@...ux.microsoft.com>
Subject: [for-next][PATCH 12/25] tracing/user_events: Split header into uapi and kernel

From: Beau Belgrave <beaub@...ux.microsoft.com>

The UAPI parts need to be split out from the kernel parts of user_events
now that other parts of the kernel will reference it. Do so by moving
the existing include/linux/user_events.h into
include/uapi/linux/user_events.h.

Link: https://lkml.kernel.org/r/20230328235219.203-2-beaub@linux.microsoft.com

Signed-off-by: Beau Belgrave <beaub@...ux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 include/linux/user_events.h      | 52 ++++----------------------------
 include/uapi/linux/user_events.h | 48 +++++++++++++++++++++++++++++
 kernel/trace/trace_events_user.c |  5 ---
 3 files changed, 54 insertions(+), 51 deletions(-)
 create mode 100644 include/uapi/linux/user_events.h

diff --git a/include/linux/user_events.h b/include/linux/user_events.h
index 592a3fbed98e..13689589d36e 100644
--- a/include/linux/user_events.h
+++ b/include/linux/user_events.h
@@ -1,54 +1,14 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (c) 2021, Microsoft Corporation.
+ * Copyright (c) 2022, Microsoft Corporation.
  *
  * Authors:
  *   Beau Belgrave <beaub@...ux.microsoft.com>
  */
-#ifndef _UAPI_LINUX_USER_EVENTS_H
-#define _UAPI_LINUX_USER_EVENTS_H
 
-#include <linux/types.h>
-#include <linux/ioctl.h>
+#ifndef _LINUX_USER_EVENTS_H
+#define _LINUX_USER_EVENTS_H
 
-#ifdef __KERNEL__
-#include <linux/uio.h>
-#else
-#include <sys/uio.h>
-#endif
+#include <uapi/linux/user_events.h>
 
-#define USER_EVENTS_SYSTEM "user_events"
-#define USER_EVENTS_PREFIX "u:"
-
-/* Create dynamic location entry within a 32-bit value */
-#define DYN_LOC(offset, size) ((size) << 16 | (offset))
-
-/*
- * Describes an event registration and stores the results of the registration.
- * This structure is passed to the DIAG_IOCSREG ioctl, callers at a minimum
- * must set the size and name_args before invocation.
- */
-struct user_reg {
-
-	/* Input: Size of the user_reg structure being used */
-	__u32 size;
-
-	/* Input: Pointer to string with event name, description and flags */
-	__u64 name_args;
-
-	/* Output: Bitwise index of the event within the status page */
-	__u32 status_bit;
-
-	/* Output: Index of the event to use when writing data */
-	__u32 write_index;
-} __attribute__((__packed__));
-
-#define DIAG_IOC_MAGIC '*'
-
-/* Requests to register a user_event */
-#define DIAG_IOCSREG _IOWR(DIAG_IOC_MAGIC, 0, struct user_reg*)
-
-/* Requests to delete a user_event */
-#define DIAG_IOCSDEL _IOW(DIAG_IOC_MAGIC, 1, char*)
-
-#endif /* _UAPI_LINUX_USER_EVENTS_H */
+#endif /* _LINUX_USER_EVENTS_H */
diff --git a/include/uapi/linux/user_events.h b/include/uapi/linux/user_events.h
new file mode 100644
index 000000000000..03f92366068d
--- /dev/null
+++ b/include/uapi/linux/user_events.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (c) 2021-2022, Microsoft Corporation.
+ *
+ * Authors:
+ *   Beau Belgrave <beaub@...ux.microsoft.com>
+ */
+#ifndef _UAPI_LINUX_USER_EVENTS_H
+#define _UAPI_LINUX_USER_EVENTS_H
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+#define USER_EVENTS_SYSTEM "user_events"
+#define USER_EVENTS_PREFIX "u:"
+
+/* Create dynamic location entry within a 32-bit value */
+#define DYN_LOC(offset, size) ((size) << 16 | (offset))
+
+/*
+ * Describes an event registration and stores the results of the registration.
+ * This structure is passed to the DIAG_IOCSREG ioctl, callers at a minimum
+ * must set the size and name_args before invocation.
+ */
+struct user_reg {
+
+	/* Input: Size of the user_reg structure being used */
+	__u32 size;
+
+	/* Input: Pointer to string with event name, description and flags */
+	__u64 name_args;
+
+	/* Output: Bitwise index of the event within the status page */
+	__u32 status_bit;
+
+	/* Output: Index of the event to use when writing data */
+	__u32 write_index;
+} __attribute__((__packed__));
+
+#define DIAG_IOC_MAGIC '*'
+
+/* Request to register a user_event */
+#define DIAG_IOCSREG _IOWR(DIAG_IOC_MAGIC, 0, struct user_reg *)
+
+/* Request to delete a user_event */
+#define DIAG_IOCSDEL _IOW(DIAG_IOC_MAGIC, 1, char *)
+
+#endif /* _UAPI_LINUX_USER_EVENTS_H */
diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c
index 908e8a13c675..070551480747 100644
--- a/kernel/trace/trace_events_user.c
+++ b/kernel/trace/trace_events_user.c
@@ -19,12 +19,7 @@
 #include <linux/tracefs.h>
 #include <linux/types.h>
 #include <linux/uaccess.h>
-/* Reminder to move to uapi when everything works */
-#ifdef CONFIG_COMPILE_TEST
 #include <linux/user_events.h>
-#else
-#include <uapi/linux/user_events.h>
-#endif
 #include "trace.h"
 #include "trace_dynevent.h"
 
-- 
2.39.1