[PATCH v2 00/11] Introduce kernel_clone(), kill _do_fork()

[PATCH v2 00/11] Introduce kernel_clone(), kill _do_fork()

[Christian Brauner]

Hey everyone,

This is a follow-up to the fork-related cleanup. It's based on a brief
discussion after the initial series was merged.
Last cycle we removed copy_thread_tls() and the associated Kconfig
option for each architecture. Now we are only left with copy_thread().
Part of this work was removing the old do_fork() legacy clone()-style
calling convention in favor of the new struct kernel_clone args calling
convention.
The only remaining function callable outside of kernel/fork.c is
_do_fork(). It doesn't really follow the naming of kernel-internal
syscall helpers as Christoph righly pointed out. Switch all callers and
references to kernel_clone() and remove _do_fork() once and for all also
switching the return value for kernel_clone() from long to pid_t since
that's what we use in all other places where we're dealing with process
identifiers.

For all architectures I have done a full git rebase v5.9-rc1 -x "make
-j31". There were no built failures and the changes were fairly
mechanical.

The only helpers we have left now are kernel_thread() and kernel_clone()
where kernel_thread() just calls kernel_clone().

Thanks!
Christian

Christian Brauner (11):
  fork: introduce kernel_clone()
  h8300: switch to kernel_clone()
  ia64: switch to kernel_clone()
  m68k: switch to kernel_clone()
  nios2: switch to kernel_clone()
  sparc: switch to kernel_clone()
  x86: switch to kernel_clone()
  kprobes: switch to kernel_clone()
  kgdbts: switch to kernel_clone()
  tracing: switch to kernel_clone()
  sched: remove _do_fork()

 Documentation/trace/histogram.rst             |  4 +-
 arch/h8300/kernel/process.c                   |  2 +-
 arch/ia64/kernel/process.c                    |  4 +-
 arch/m68k/kernel/process.c                    | 10 ++--
 arch/nios2/kernel/process.c                   |  2 +-
 arch/sparc/kernel/process.c                   |  6 +--
 arch/x86/kernel/sys_ia32.c                    |  2 +-
 drivers/misc/kgdbts.c                         | 48 +++++++++----------
 include/linux/sched/task.h                    |  2 +-
 kernel/fork.c                                 | 16 +++----
 samples/kprobes/kprobe_example.c              |  6 +--
 samples/kprobes/kretprobe_example.c           |  4 +-
 .../test.d/dynevent/add_remove_kprobe.tc      |  2 +-
 .../test.d/dynevent/clear_select_events.tc    |  2 +-
 .../test.d/dynevent/generic_clear_event.tc    |  2 +-
 .../test.d/ftrace/func-filter-stacktrace.tc   |  4 +-
 .../ftrace/test.d/kprobe/add_and_remove.tc    |  2 +-
 .../ftrace/test.d/kprobe/busy_check.tc        |  2 +-
 .../ftrace/test.d/kprobe/kprobe_args.tc       |  4 +-
 .../ftrace/test.d/kprobe/kprobe_args_comm.tc  |  2 +-
 .../test.d/kprobe/kprobe_args_string.tc       |  4 +-
 .../test.d/kprobe/kprobe_args_symbol.tc       | 10 ++--
 .../ftrace/test.d/kprobe/kprobe_args_type.tc  |  2 +-
 .../ftrace/test.d/kprobe/kprobe_ftrace.tc     | 14 +++---
 .../ftrace/test.d/kprobe/kprobe_multiprobe.tc |  2 +-
 .../test.d/kprobe/kprobe_syntax_errors.tc     | 12 ++---
 .../ftrace/test.d/kprobe/kretprobe_args.tc    |  4 +-
 .../selftests/ftrace/test.d/kprobe/profile.tc |  2 +-
 28 files changed, 88 insertions(+), 88 deletions(-)


base-commit: 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5
-- 
2.28.0

[PATCH v2 01/11] fork: introduce kernel_clone()

[Christian Brauner]

The old _do_fork() helper doesn't follow naming conventions of in-kernel
helpers for syscalls. The process creation cleanup in [1] didn't change the
name to something more reasonable mainly because _do_fork() was used in quite a
few places. So sending this as a separate series seemed the better strategy.

This commit does two things:
1. renames _do_fork() to kernel_clone() but keeps _do_fork() as a simple static
   inline wrapper around kernel_clone().
2. Changes the return type from long to pid_t. This aligns kernel_thread() and
   kernel_clone(). Also, the return value from kernel_clone that is surfaced in
   fork(), vfork(), clone(), and clone3() is taken from pid_vrn() which returns
   a pid_t too.

Follow-up patches will switch each caller of _do_fork() and each place where it
is referenced over to kernel_clone(). After all these changes are done, we can
remove _do_fork() completely and will only be left with kernel_clone().

[1]: 9ba27414f2ec ("Merge tag 'fork-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux")
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
- Matthew Wilcox (Oracle) <willy@infradead.org>:
  - make kernel_clone() return pid_t
---
 include/linux/sched/task.h |  6 +++++-
 kernel/fork.c              | 16 ++++++++--------
 2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index a98965007eef..d4428039c3c1 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -83,7 +83,11 @@ extern void do_group_exit(int);
 extern void exit_files(struct task_struct *);
 extern void exit_itimers(struct signal_struct *);
 
-extern long _do_fork(struct kernel_clone_args *kargs);
+extern pid_t kernel_clone(struct kernel_clone_args *kargs);
+static inline long _do_fork(struct kernel_clone_args *kargs)
+{
+	return kernel_clone(kargs);
+}
 struct task_struct *fork_idle(int);
 struct mm_struct *copy_init_mm(void);
 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
diff --git a/kernel/fork.c b/kernel/fork.c
index 4d32190861bd..d822c7a4b9c4 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2384,14 +2384,14 @@ struct mm_struct *copy_init_mm(void)
  *
  * args->exit_signal is expected to be checked for sanity by the caller.
  */
-long _do_fork(struct kernel_clone_args *args)
+pid_t kernel_clone(struct kernel_clone_args *args)
 {
 	u64 clone_flags = args->flags;
 	struct completion vfork;
 	struct pid *pid;
 	struct task_struct *p;
 	int trace = 0;
-	long nr;
+	pid_t nr;
 
 	/*
 	 * For legacy clone() calls, CLONE_PIDFD uses the parent_tid argument
@@ -2477,7 +2477,7 @@ pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
 		.stack_size	= (unsigned long)arg,
 	};
 
-	return _do_fork(&args);
+	return kernel_clone(&args);
 }
 
 #ifdef __ARCH_WANT_SYS_FORK
@@ -2488,7 +2488,7 @@ SYSCALL_DEFINE0(fork)
 		.exit_signal = SIGCHLD,
 	};
 
-	return _do_fork(&args);
+	return kernel_clone(&args);
 #else
 	/* can not support in nommu mode */
 	return -EINVAL;
@@ -2504,7 +2504,7 @@ SYSCALL_DEFINE0(vfork)
 		.exit_signal	= SIGCHLD,
 	};
 
-	return _do_fork(&args);
+	return kernel_clone(&args);
 }
 #endif
 
@@ -2542,7 +2542,7 @@ SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
 		.tls		= tls,
 	};
 
-	return _do_fork(&args);
+	return kernel_clone(&args);
 }
 #endif
 
@@ -2700,7 +2700,7 @@ SYSCALL_DEFINE2(clone3, struct clone_args __user *, uargs, size_t, size)
 	if (!clone3_args_valid(&kargs))
 		return -EINVAL;
 
-	return _do_fork(&kargs);
+	return kernel_clone(&kargs);
 }
 #endif
 
@@ -2863,7 +2863,7 @@ int unshare_fd(unsigned long unshare_flags, unsigned int max_fds,
 /*
  * unshare allows a process to 'unshare' part of the process
  * context which was originally shared using clone.  copy_*
- * functions used by _do_fork() cannot be used here directly
+ * functions used by kernel_clone() cannot be used here directly
  * because they modify an inactive task_struct that is being
  * constructed. Here we are modifying the current, active,
  * task_struct.
-- 
2.28.0

[PATCH v2 02/11] h8300: switch to kernel_clone()

[Christian Brauner]

The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
The latter adheres to naming conventions for kernel internal syscall helpers.

Cc: Greentime Hu <green.hu@gmail.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: uclinux-h8-devel@lists.sourceforge.jp
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
unchanged
---
 arch/h8300/kernel/process.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/h8300/kernel/process.c b/arch/h8300/kernel/process.c
index 83ce3caf7313..aea0a40b77a9 100644
--- a/arch/h8300/kernel/process.c
+++ b/arch/h8300/kernel/process.c
@@ -172,5 +172,5 @@ asmlinkage int sys_clone(unsigned long __user *args)
 	kargs.exit_signal	= (lower_32_bits(clone_flags) & CSIGNAL);
 	kargs.stack		= newsp;
 
-	return _do_fork(&kargs);
+	return kernel_clone(&kargs);
 }
-- 
2.28.0

[PATCH v2 03/11] ia64: switch to kernel_clone()

[Christian Brauner]

The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
The latter adheres to naming conventions for kernel internal syscall helpers.

Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: linux-ia64@vger.kernel.org
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
unchanged
---
 arch/ia64/kernel/process.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index f19cb97c0098..126f72490ec7 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -310,7 +310,7 @@ ia64_load_extra (struct task_struct *task)
  *
  *	<clone syscall>	        <some kernel call frames>
  *	sys_clone		   :
- *	_do_fork		_do_fork
+ *	kernel_clone		kernel_clone
  *	copy_thread		copy_thread
  *
  * This means that the stack layout is as follows:
@@ -455,7 +455,7 @@ asmlinkage long ia64_clone(unsigned long clone_flags, unsigned long stack_start,
 		.tls		= tls,
 	};
 
-	return _do_fork(&args);
+	return kernel_clone(&args);
 }
 
 static void
-- 
2.28.0

[PATCH v2 04/11] m68k: switch to kernel_clone()

[Christian Brauner]

The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
The latter adheres to naming conventions for kernel internal syscall helpers.

Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Kars de Jong <jongk@linux-m68k.org>
Cc: linux-m68k@lists.linux-m68k.org
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
unchanged
---
 arch/m68k/kernel/process.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index 6492a2c54dbc..08359a6e058f 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -107,10 +107,10 @@ void flush_thread(void)
  * on top of pt_regs, which means that sys_clone() arguments would be
  * buried.  We could, of course, copy them, but it's too costly for no
  * good reason - generic clone() would have to copy them *again* for
- * _do_fork() anyway.  So in this case it's actually better to pass pt_regs *
- * and extract arguments for _do_fork() from there.  Eventually we might
- * go for calling _do_fork() directly from the wrapper, but only after we
- * are finished with _do_fork() prototype conversion.
+ * kernel_clone() anyway.  So in this case it's actually better to pass pt_regs *
+ * and extract arguments for kernel_clone() from there.  Eventually we might
+ * go for calling kernel_clone() directly from the wrapper, but only after we
+ * are finished with kernel_clone() prototype conversion.
  */
 asmlinkage int m68k_clone(struct pt_regs *regs)
 {
@@ -125,7 +125,7 @@ asmlinkage int m68k_clone(struct pt_regs *regs)
 		.tls		= regs->d5,
 	};
 
-	return _do_fork(&args);
+	return kernel_clone(&args);
 }
 
 /*
-- 
2.28.0

[PATCH v2 05/11] nios2: switch to kernel_clone()

[Christian Brauner]

The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
The latter adheres to naming conventions for kernel internal syscall helpers.

Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
unchanged
---
 arch/nios2/kernel/process.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/nios2/kernel/process.c b/arch/nios2/kernel/process.c
index 88a4ec03edab..4ffe857e6ada 100644
--- a/arch/nios2/kernel/process.c
+++ b/arch/nios2/kernel/process.c
@@ -266,5 +266,5 @@ asmlinkage int nios2_clone(unsigned long clone_flags, unsigned long newsp,
 		.tls		= tls,
 	};
 
-	return _do_fork(&args);
+	return kernel_clone(&args);
 }
-- 
2.28.0

[PATCH v2 06/11] sparc: switch to kernel_clone()

[Christian Brauner]

The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
The latter adheres to naming conventions for kernel internal syscall helpers.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
unchanged
---
 arch/sparc/kernel/process.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/sparc/kernel/process.c b/arch/sparc/kernel/process.c
index 5234b5ccc0b9..0442ab00518d 100644
--- a/arch/sparc/kernel/process.c
+++ b/arch/sparc/kernel/process.c
@@ -25,7 +25,7 @@ asmlinkage long sparc_fork(struct pt_regs *regs)
 		.stack		= regs->u_regs[UREG_FP],
 	};
 
-	ret = _do_fork(&args);
+	ret = kernel_clone(&args);
 
 	/* If we get an error and potentially restart the system
 	 * call, we're screwed because copy_thread() clobbered
@@ -50,7 +50,7 @@ asmlinkage long sparc_vfork(struct pt_regs *regs)
 		.stack		= regs->u_regs[UREG_FP],
 	};
 
-	ret = _do_fork(&args);
+	ret = kernel_clone(&args);
 
 	/* If we get an error and potentially restart the system
 	 * call, we're screwed because copy_thread() clobbered
@@ -96,7 +96,7 @@ asmlinkage long sparc_clone(struct pt_regs *regs)
 	else
 		args.stack = regs->u_regs[UREG_FP];
 
-	ret = _do_fork(&args);
+	ret = kernel_clone(&args);
 
 	/* If we get an error and potentially restart the system
 	 * call, we're screwed because copy_thread() clobbered
-- 
2.28.0

Re: [PATCH v2 06/11] sparc: switch to kernel_clone()

[David Miller]

From: Christian Brauner <christian.brauner@ubuntu.com>
Date: Wed, 19 Aug 2020 12:46:50 +0200

> The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
> The latter adheres to naming conventions for kernel internal syscall helpers.
> 
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: sparclinux@vger.kernel.org
> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Acked-by: David S. Miller <davem@davemloft.net>

[PATCH v2 07/11] x86: switch to kernel_clone()

[Christian Brauner]

The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
The latter adheres to naming conventions for kernel internal syscall helpers.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: x86@kernel.org
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
unchanged
---
 arch/x86/kernel/sys_ia32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/sys_ia32.c b/arch/x86/kernel/sys_ia32.c
index 720cde885042..6cf65397d225 100644
--- a/arch/x86/kernel/sys_ia32.c
+++ b/arch/x86/kernel/sys_ia32.c
@@ -251,6 +251,6 @@ COMPAT_SYSCALL_DEFINE5(ia32_clone, unsigned long, clone_flags,
 		.tls		= tls_val,
 	};
 
-	return _do_fork(&args);
+	return kernel_clone(&args);
 }
 #endif /* CONFIG_IA32_EMULATION */
-- 
2.28.0

[PATCH v2 08/11] kprobes: switch to kernel_clone()

[Christian Brauner]

The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
The latter adheres to naming conventions for kernel internal syscall helpers.

Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Cc: Alexandre Chartre <alexandre.chartre@oracle.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
unchanged
---
 samples/kprobes/kprobe_example.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
index 240f2435ce6f..a02f53836ee1 100644
--- a/samples/kprobes/kprobe_example.c
+++ b/samples/kprobes/kprobe_example.c
@@ -2,13 +2,13 @@
 /*
  * NOTE: This example is works on x86 and powerpc.
  * Here's a sample kernel module showing the use of kprobes to dump a
- * stack trace and selected registers when _do_fork() is called.
+ * stack trace and selected registers when kernel_clone() is called.
  *
  * For more information on theory of operation of kprobes, see
  * Documentation/staging/kprobes.rst
  *
  * You will see the trace data in /var/log/messages and on the console
- * whenever _do_fork() is invoked to create a new process.
+ * whenever kernel_clone() is invoked to create a new process.
  */
 
 #include <linux/kernel.h>
@@ -16,7 +16,7 @@
 #include <linux/kprobes.h>
 
 #define MAX_SYMBOL_LEN	64
-static char symbol[MAX_SYMBOL_LEN] = "_do_fork";
+static char symbol[MAX_SYMBOL_LEN] = "kernel_clone";
 module_param_string(symbol, symbol, sizeof(symbol), 0644);
 
 /* For each probe you need to allocate a kprobe structure */
-- 
2.28.0

Re: [PATCH v2 08/11] kprobes: switch to kernel_clone()

[Masami Hiramatsu]

Hi,

On Wed, 19 Aug 2020 12:46:52 +0200
Christian Brauner <christian.brauner@ubuntu.com> wrote:

> The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
> The latter adheres to naming conventions for kernel internal syscall helpers.

This looks good to me.

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>

Thank you!

> 
> Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> Cc: Alexandre Chartre <alexandre.chartre@oracle.com>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: Masami Hiramatsu <mhiramat@kernel.org>
> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
> ---
> /* v2 */
> unchanged
> ---
>  samples/kprobes/kprobe_example.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
> index 240f2435ce6f..a02f53836ee1 100644
> --- a/samples/kprobes/kprobe_example.c
> +++ b/samples/kprobes/kprobe_example.c
> @@ -2,13 +2,13 @@
>  /*
>   * NOTE: This example is works on x86 and powerpc.
>   * Here's a sample kernel module showing the use of kprobes to dump a
> - * stack trace and selected registers when _do_fork() is called.
> + * stack trace and selected registers when kernel_clone() is called.
>   *
>   * For more information on theory of operation of kprobes, see
>   * Documentation/staging/kprobes.rst
>   *
>   * You will see the trace data in /var/log/messages and on the console
> - * whenever _do_fork() is invoked to create a new process.
> + * whenever kernel_clone() is invoked to create a new process.
>   */
>  
>  #include <linux/kernel.h>
> @@ -16,7 +16,7 @@
>  #include <linux/kprobes.h>
>  
>  #define MAX_SYMBOL_LEN	64
> -static char symbol[MAX_SYMBOL_LEN] = "_do_fork";
> +static char symbol[MAX_SYMBOL_LEN] = "kernel_clone";
>  module_param_string(symbol, symbol, sizeof(symbol), 0644);
>  
>  /* For each probe you need to allocate a kprobe structure */
> -- 
> 2.28.0
> 


-- 
Masami Hiramatsu <mhiramat@kernel.org>

[PATCH v2 09/11] kgdbts: switch to kernel_clone()

[Christian Brauner]

The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
The latter adheres to naming conventions for kernel internal syscall helpers.

Cc: Douglas Anderson <dianders@chromium.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: kgdb-bugreport@lists.sourceforge.net
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
unchanged
---
 drivers/misc/kgdbts.c | 48 +++++++++++++++++++++----------------------
 1 file changed, 24 insertions(+), 24 deletions(-)

diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c
index d5d2af4d10e6..945701bce553 100644
--- a/drivers/misc/kgdbts.c
+++ b/drivers/misc/kgdbts.c
@@ -33,16 +33,16 @@
  * You can also specify optional tests:
  * N## = Go to sleep with interrupts of for ## seconds
  *       to test the HW NMI watchdog
- * F## = Break at do_fork for ## iterations
+ * F## = Break at kernel_clone for ## iterations
  * S## = Break at sys_open for ## iterations
  * I## = Run the single step test ## iterations
  *
- * NOTE: that the do_fork and sys_open tests are mutually exclusive.
+ * NOTE: that the kernel_clone and sys_open tests are mutually exclusive.
  *
  * To invoke the kgdb test suite from boot you use a kernel start
  * argument as follows:
  * 	kgdbts=V1 kgdbwait
- * Or if you wanted to perform the NMI test for 6 seconds and do_fork
+ * Or if you wanted to perform the NMI test for 6 seconds and kernel_clone
  * test for 100 forks, you could use:
  * 	kgdbts=V1N6F100 kgdbwait
  *
@@ -74,7 +74,7 @@
  * echo kgdbts=V1S10000 > /sys/module/kgdbts/parameters/kgdbts
  * fg # and hit control-c
  * fg # and hit control-c
- * ## This tests break points on do_fork
+ * ## This tests break points on kernel_clone
  * while [ 1 ] ; do date > /dev/null ; done &
  * while [ 1 ] ; do date > /dev/null ; done &
  * echo kgdbts=V1F1000 > /sys/module/kgdbts/parameters/kgdbts
@@ -209,8 +209,8 @@ static unsigned long lookup_addr(char *arg)
 		addr = (unsigned long)kgdbts_break_test;
 	else if (!strcmp(arg, "sys_open"))
 		addr = (unsigned long)do_sys_open;
-	else if (!strcmp(arg, "do_fork"))
-		addr = (unsigned long)_do_fork;
+	else if (!strcmp(arg, "kernel_clone"))
+		addr = (unsigned long)kernel_clone;
 	else if (!strcmp(arg, "hw_break_val"))
 		addr = (unsigned long)&hw_break_val;
 	addr = (unsigned long) dereference_function_descriptor((void *)addr);
@@ -310,7 +310,7 @@ static int check_and_rewind_pc(char *put_str, char *arg)
 
 	if (arch_needs_sstep_emulation && sstep_addr &&
 	    ip + offset == sstep_addr &&
-	    ((!strcmp(arg, "sys_open") || !strcmp(arg, "do_fork")))) {
+	    ((!strcmp(arg, "sys_open") || !strcmp(arg, "kernel_clone")))) {
 		/* This is special case for emulated single step */
 		v2printk("Emul: rewind hit single step bp\n");
 		restart_from_top_after_write = 1;
@@ -596,19 +596,19 @@ static struct test_struct singlestep_break_test[] = {
 };
 
 /*
- * Test for hitting a breakpoint at do_fork for what ever the number
+ * Test for hitting a breakpoint at kernel_clone for what ever the number
  * of iterations required by the variable repeat_test.
  */
-static struct test_struct do_fork_test[] = {
+static struct test_struct do_kernel_clone_test[] = {
 	{ "?", "S0*" }, /* Clear break points */
-	{ "do_fork", "OK", sw_break, }, /* set sw breakpoint */
+	{ "kernel_clone", "OK", sw_break, }, /* set sw breakpoint */
 	{ "c", "T0*", NULL, get_thread_id_continue }, /* Continue */
-	{ "do_fork", "OK", sw_rem_break }, /*remove breakpoint */
-	{ "g", "do_fork", NULL, check_and_rewind_pc }, /* check location */
+	{ "kernel_clone", "OK", sw_rem_break }, /*remove breakpoint */
+	{ "g", "kernel_clone", NULL, check_and_rewind_pc }, /* check location */
 	{ "write", "OK", write_regs, emul_reset }, /* Write registers */
 	{ "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
-	{ "g", "do_fork", NULL, check_single_step },
-	{ "do_fork", "OK", sw_break, }, /* set sw breakpoint */
+	{ "g", "kernel_clone", NULL, check_single_step },
+	{ "kernel_clone", "OK", sw_break, }, /* set sw breakpoint */
 	{ "7", "T0*", skip_back_repeat_test }, /* Loop based on repeat_test */
 	{ "D", "OK", NULL, final_ack_set }, /* detach and unregister I/O */
 	{ "", "", get_cont_catch, put_cont_catch },
@@ -935,11 +935,11 @@ static void run_bad_read_test(void)
 	kgdb_breakpoint();
 }
 
-static void run_do_fork_test(void)
+static void run_kernel_clone_test(void)
 {
 	init_simple_test();
-	ts.tst = do_fork_test;
-	ts.name = "do_fork_test";
+	ts.tst = do_kernel_clone_test;
+	ts.name = "do_kernel_clone_test";
 	/* Activate test with initial breakpoint */
 	kgdb_breakpoint();
 }
@@ -967,7 +967,7 @@ static void run_singlestep_break_test(void)
 static void kgdbts_run_tests(void)
 {
 	char *ptr;
-	int fork_test = 0;
+	int clone_test = 0;
 	int do_sys_open_test = 0;
 	int sstep_test = 1000;
 	int nmi_sleep = 0;
@@ -981,7 +981,7 @@ static void kgdbts_run_tests(void)
 
 	ptr = strchr(config, 'F');
 	if (ptr)
-		fork_test = simple_strtol(ptr + 1, NULL, 10);
+		clone_test = simple_strtol(ptr + 1, NULL, 10);
 	ptr = strchr(config, 'S');
 	if (ptr)
 		do_sys_open_test = simple_strtol(ptr + 1, NULL, 10);
@@ -1025,16 +1025,16 @@ static void kgdbts_run_tests(void)
 		run_nmi_sleep_test(nmi_sleep);
 	}
 
-	/* If the do_fork test is run it will be the last test that is
+	/* If the kernel_clone test is run it will be the last test that is
 	 * executed because a kernel thread will be spawned at the very
 	 * end to unregister the debug hooks.
 	 */
-	if (fork_test) {
-		repeat_test = fork_test;
-		printk(KERN_INFO "kgdbts:RUN do_fork for %i breakpoints\n",
+	if (clone_test) {
+		repeat_test = clone_test;
+		printk(KERN_INFO "kgdbts:RUN kernel_clone for %i breakpoints\n",
 			repeat_test);
 		kthread_run(kgdbts_unreg_thread, NULL, "kgdbts_unreg");
-		run_do_fork_test();
+		run_kernel_clone_test();
 		return;
 	}
 
-- 
2.28.0

Re: [PATCH v2 09/11] kgdbts: switch to kernel_clone()

[Daniel Thompson]

On Wed, Aug 19, 2020 at 12:46:53PM +0200, Christian Brauner wrote:
> The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
> The latter adheres to naming conventions for kernel internal syscall helpers.
> 
> Cc: Douglas Anderson <dianders@chromium.org>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jason Wessel <jason.wessel@windriver.com>
> Cc: kgdb-bugreport@lists.sourceforge.net
> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Tested-by: Daniel Thompson <daniel.thompson@linaro.org>


Daniel.

> ---
> /* v2 */
> unchanged
> ---
>  drivers/misc/kgdbts.c | 48 +++++++++++++++++++++----------------------
>  1 file changed, 24 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c
> index d5d2af4d10e6..945701bce553 100644
> --- a/drivers/misc/kgdbts.c
> +++ b/drivers/misc/kgdbts.c
> @@ -33,16 +33,16 @@
>   * You can also specify optional tests:
>   * N## = Go to sleep with interrupts of for ## seconds
>   *       to test the HW NMI watchdog
> - * F## = Break at do_fork for ## iterations
> + * F## = Break at kernel_clone for ## iterations
>   * S## = Break at sys_open for ## iterations
>   * I## = Run the single step test ## iterations
>   *
> - * NOTE: that the do_fork and sys_open tests are mutually exclusive.
> + * NOTE: that the kernel_clone and sys_open tests are mutually exclusive.
>   *
>   * To invoke the kgdb test suite from boot you use a kernel start
>   * argument as follows:
>   * 	kgdbts=V1 kgdbwait
> - * Or if you wanted to perform the NMI test for 6 seconds and do_fork
> + * Or if you wanted to perform the NMI test for 6 seconds and kernel_clone
>   * test for 100 forks, you could use:
>   * 	kgdbts=V1N6F100 kgdbwait
>   *
> @@ -74,7 +74,7 @@
>   * echo kgdbts=V1S10000 > /sys/module/kgdbts/parameters/kgdbts
>   * fg # and hit control-c
>   * fg # and hit control-c
> - * ## This tests break points on do_fork
> + * ## This tests break points on kernel_clone
>   * while [ 1 ] ; do date > /dev/null ; done &
>   * while [ 1 ] ; do date > /dev/null ; done &
>   * echo kgdbts=V1F1000 > /sys/module/kgdbts/parameters/kgdbts
> @@ -209,8 +209,8 @@ static unsigned long lookup_addr(char *arg)
>  		addr = (unsigned long)kgdbts_break_test;
>  	else if (!strcmp(arg, "sys_open"))
>  		addr = (unsigned long)do_sys_open;
> -	else if (!strcmp(arg, "do_fork"))
> -		addr = (unsigned long)_do_fork;
> +	else if (!strcmp(arg, "kernel_clone"))
> +		addr = (unsigned long)kernel_clone;
>  	else if (!strcmp(arg, "hw_break_val"))
>  		addr = (unsigned long)&hw_break_val;
>  	addr = (unsigned long) dereference_function_descriptor((void *)addr);
> @@ -310,7 +310,7 @@ static int check_and_rewind_pc(char *put_str, char *arg)
>  
>  	if (arch_needs_sstep_emulation && sstep_addr &&
>  	    ip + offset == sstep_addr &&
> -	    ((!strcmp(arg, "sys_open") || !strcmp(arg, "do_fork")))) {
> +	    ((!strcmp(arg, "sys_open") || !strcmp(arg, "kernel_clone")))) {
>  		/* This is special case for emulated single step */
>  		v2printk("Emul: rewind hit single step bp\n");
>  		restart_from_top_after_write = 1;
> @@ -596,19 +596,19 @@ static struct test_struct singlestep_break_test[] = {
>  };
>  
>  /*
> - * Test for hitting a breakpoint at do_fork for what ever the number
> + * Test for hitting a breakpoint at kernel_clone for what ever the number
>   * of iterations required by the variable repeat_test.
>   */
> -static struct test_struct do_fork_test[] = {
> +static struct test_struct do_kernel_clone_test[] = {
>  	{ "?", "S0*" }, /* Clear break points */
> -	{ "do_fork", "OK", sw_break, }, /* set sw breakpoint */
> +	{ "kernel_clone", "OK", sw_break, }, /* set sw breakpoint */
>  	{ "c", "T0*", NULL, get_thread_id_continue }, /* Continue */
> -	{ "do_fork", "OK", sw_rem_break }, /*remove breakpoint */
> -	{ "g", "do_fork", NULL, check_and_rewind_pc }, /* check location */
> +	{ "kernel_clone", "OK", sw_rem_break }, /*remove breakpoint */
> +	{ "g", "kernel_clone", NULL, check_and_rewind_pc }, /* check location */
>  	{ "write", "OK", write_regs, emul_reset }, /* Write registers */
>  	{ "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
> -	{ "g", "do_fork", NULL, check_single_step },
> -	{ "do_fork", "OK", sw_break, }, /* set sw breakpoint */
> +	{ "g", "kernel_clone", NULL, check_single_step },
> +	{ "kernel_clone", "OK", sw_break, }, /* set sw breakpoint */
>  	{ "7", "T0*", skip_back_repeat_test }, /* Loop based on repeat_test */
>  	{ "D", "OK", NULL, final_ack_set }, /* detach and unregister I/O */
>  	{ "", "", get_cont_catch, put_cont_catch },
> @@ -935,11 +935,11 @@ static void run_bad_read_test(void)
>  	kgdb_breakpoint();
>  }
>  
> -static void run_do_fork_test(void)
> +static void run_kernel_clone_test(void)
>  {
>  	init_simple_test();
> -	ts.tst = do_fork_test;
> -	ts.name = "do_fork_test";
> +	ts.tst = do_kernel_clone_test;
> +	ts.name = "do_kernel_clone_test";
>  	/* Activate test with initial breakpoint */
>  	kgdb_breakpoint();
>  }
> @@ -967,7 +967,7 @@ static void run_singlestep_break_test(void)
>  static void kgdbts_run_tests(void)
>  {
>  	char *ptr;
> -	int fork_test = 0;
> +	int clone_test = 0;
>  	int do_sys_open_test = 0;
>  	int sstep_test = 1000;
>  	int nmi_sleep = 0;
> @@ -981,7 +981,7 @@ static void kgdbts_run_tests(void)
>  
>  	ptr = strchr(config, 'F');
>  	if (ptr)
> -		fork_test = simple_strtol(ptr + 1, NULL, 10);
> +		clone_test = simple_strtol(ptr + 1, NULL, 10);
>  	ptr = strchr(config, 'S');
>  	if (ptr)
>  		do_sys_open_test = simple_strtol(ptr + 1, NULL, 10);
> @@ -1025,16 +1025,16 @@ static void kgdbts_run_tests(void)
>  		run_nmi_sleep_test(nmi_sleep);
>  	}
>  
> -	/* If the do_fork test is run it will be the last test that is
> +	/* If the kernel_clone test is run it will be the last test that is
>  	 * executed because a kernel thread will be spawned at the very
>  	 * end to unregister the debug hooks.
>  	 */
> -	if (fork_test) {
> -		repeat_test = fork_test;
> -		printk(KERN_INFO "kgdbts:RUN do_fork for %i breakpoints\n",
> +	if (clone_test) {
> +		repeat_test = clone_test;
> +		printk(KERN_INFO "kgdbts:RUN kernel_clone for %i breakpoints\n",
>  			repeat_test);
>  		kthread_run(kgdbts_unreg_thread, NULL, "kgdbts_unreg");
> -		run_do_fork_test();
> +		run_kernel_clone_test();
>  		return;
>  	}
>  
> -- 
> 2.28.0
> 

[PATCH v2 10/11] tracing: switch to kernel_clone()

[Christian Brauner]

The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
The latter adheres to naming conventions for kernel internal syscall helpers.

Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Cc: Alexandre Chartre <alexandre.chartre@oracle.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Xiao Yang <yangx.jy@cn.fujitsu.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: linux-doc@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
unchanged
---
 Documentation/trace/histogram.rst                  |  4 ++--
 samples/kprobes/kretprobe_example.c                |  4 ++--
 .../ftrace/test.d/dynevent/add_remove_kprobe.tc    |  2 +-
 .../ftrace/test.d/dynevent/clear_select_events.tc  |  2 +-
 .../ftrace/test.d/dynevent/generic_clear_event.tc  |  2 +-
 .../ftrace/test.d/ftrace/func-filter-stacktrace.tc |  4 ++--
 .../ftrace/test.d/kprobe/add_and_remove.tc         |  2 +-
 .../selftests/ftrace/test.d/kprobe/busy_check.tc   |  2 +-
 .../selftests/ftrace/test.d/kprobe/kprobe_args.tc  |  4 ++--
 .../ftrace/test.d/kprobe/kprobe_args_comm.tc       |  2 +-
 .../ftrace/test.d/kprobe/kprobe_args_string.tc     |  4 ++--
 .../ftrace/test.d/kprobe/kprobe_args_symbol.tc     | 10 +++++-----
 .../ftrace/test.d/kprobe/kprobe_args_type.tc       |  2 +-
 .../ftrace/test.d/kprobe/kprobe_ftrace.tc          | 14 +++++++-------
 .../ftrace/test.d/kprobe/kprobe_multiprobe.tc      |  2 +-
 .../ftrace/test.d/kprobe/kprobe_syntax_errors.tc   | 12 ++++++------
 .../ftrace/test.d/kprobe/kretprobe_args.tc         |  4 ++--
 .../selftests/ftrace/test.d/kprobe/profile.tc      |  2 +-
 18 files changed, 39 insertions(+), 39 deletions(-)

diff --git a/Documentation/trace/histogram.rst b/Documentation/trace/histogram.rst
index 8408670d0328..f93333524a44 100644
--- a/Documentation/trace/histogram.rst
+++ b/Documentation/trace/histogram.rst
@@ -1495,7 +1495,7 @@ Extended error information
     #
 
     { stacktrace:
-             _do_fork+0x18e/0x330
+             kernel_clone+0x18e/0x330
              kernel_thread+0x29/0x30
              kthreadd+0x154/0x1b0
              ret_from_fork+0x3f/0x70
@@ -1588,7 +1588,7 @@ Extended error information
              SYSC_sendto+0xef/0x170
     } hitcount:         88
     { stacktrace:
-             _do_fork+0x18e/0x330
+             kernel_clone+0x18e/0x330
              SyS_clone+0x19/0x20
              entry_SYSCALL_64_fastpath+0x12/0x6a
     } hitcount:        244
diff --git a/samples/kprobes/kretprobe_example.c b/samples/kprobes/kretprobe_example.c
index 78a2da6fb3cd..0c40f7236989 100644
--- a/samples/kprobes/kretprobe_example.c
+++ b/samples/kprobes/kretprobe_example.c
@@ -8,7 +8,7 @@
  *
  * usage: insmod kretprobe_example.ko func=<func_name>
  *
- * If no func_name is specified, _do_fork is instrumented
+ * If no func_name is specified, kernel_clone is instrumented
  *
  * For more information on theory of operation of kretprobes, see
  * Documentation/staging/kprobes.rst
@@ -26,7 +26,7 @@
 #include <linux/limits.h>
 #include <linux/sched.h>
 
-static char func_name[NAME_MAX] = "_do_fork";
+static char func_name[NAME_MAX] = "kernel_clone";
 module_param_string(func, func_name, NAME_MAX, S_IRUGO);
 MODULE_PARM_DESC(func, "Function to kretprobe; this module will report the"
 			" function's execution time");
diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc
index 68550f97d3c3..3bcd4c3624ee 100644
--- a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc
@@ -6,7 +6,7 @@
 echo 0 > events/enable
 echo > dynamic_events
 
-PLACE=_do_fork
+PLACE=kernel_clone
 
 echo "p:myevent1 $PLACE" >> dynamic_events
 echo "r:myevent2 $PLACE" >> dynamic_events
diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc b/tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc
index c969be9eb7de..438961971b7e 100644
--- a/tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc
@@ -6,7 +6,7 @@
 echo 0 > events/enable
 echo > dynamic_events
 
-PLACE=_do_fork
+PLACE=kernel_clone
 
 setup_events() {
 echo "p:myevent1 $PLACE" >> dynamic_events
diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc b/tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc
index 16d543eaac88..a8603bd23e0d 100644
--- a/tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc
@@ -6,7 +6,7 @@
 echo 0 > events/enable
 echo > dynamic_events
 
-PLACE=_do_fork
+PLACE=kernel_clone
 
 setup_events() {
 echo "p:myevent1 $PLACE" >> dynamic_events
diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
index 0f41e441c203..98305d76bd04 100644
--- a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
@@ -4,9 +4,9 @@
 # requires: set_ftrace_filter
 # flags: instance
 
-echo _do_fork:stacktrace >> set_ftrace_filter
+echo kernel_clone:stacktrace >> set_ftrace_filter
 
-grep -q "_do_fork:stacktrace:unlimited" set_ftrace_filter
+grep -q "kernel_clone:stacktrace:unlimited" set_ftrace_filter
 
 (echo "forked"; sleep 1)
 
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc b/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
index eba858c21815..9737cd0578a7 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
@@ -3,7 +3,7 @@
 # description: Kprobe dynamic event - adding and removing
 # requires: kprobe_events
 
-echo p:myevent _do_fork > kprobe_events
+echo p:myevent kernel_clone > kprobe_events
 grep myevent kprobe_events
 test -d events/kprobes/myevent
 echo > kprobe_events
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc b/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
index d10bf4f05bc8..f9a40af76888 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
@@ -3,7 +3,7 @@
 # description: Kprobe dynamic event - busy event check
 # requires: kprobe_events
 
-echo p:myevent _do_fork > kprobe_events
+echo p:myevent kernel_clone > kprobe_events
 test -d events/kprobes/myevent
 echo 1 > events/kprobes/myevent/enable
 echo > kprobe_events && exit_fail # this must fail
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
index 61f2ac441aec..eb543d3cfe5f 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
@@ -3,13 +3,13 @@
 # description: Kprobe dynamic event with arguments
 # requires: kprobe_events
 
-echo 'p:testprobe _do_fork $stack $stack0 +0($stack)' > kprobe_events
+echo 'p:testprobe kernel_clone $stack $stack0 +0($stack)' > kprobe_events
 grep testprobe kprobe_events | grep -q 'arg1=\$stack arg2=\$stack0 arg3=+0(\$stack)'
 test -d events/kprobes/testprobe
 
 echo 1 > events/kprobes/testprobe/enable
 ( echo "forked")
-grep testprobe trace | grep '_do_fork' | \
+grep testprobe trace | grep 'kernel_clone' | \
   grep -q 'arg1=0x[[:xdigit:]]* arg2=0x[[:xdigit:]]* arg3=0x[[:xdigit:]]*$'
 
 echo 0 > events/kprobes/testprobe/enable
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc
index 05aaeed6987f..4e5b63be51c9 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc
@@ -5,7 +5,7 @@
 
 grep -A1 "fetcharg:" README | grep -q "\$comm" || exit_unsupported # this is too old
 
-echo 'p:testprobe _do_fork comm=$comm ' > kprobe_events
+echo 'p:testprobe kernel_clone comm=$comm ' > kprobe_events
 grep testprobe kprobe_events | grep -q 'comm=$comm'
 test -d events/kprobes/testprobe
 
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
index b5fa05443b39..a1d70588ab21 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
@@ -30,13 +30,13 @@ esac
 : "Test get argument (1)"
 echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):string" > kprobe_events
 echo 1 > events/kprobes/testprobe/enable
-echo "p:test _do_fork" >> kprobe_events
+echo "p:test kernel_clone" >> kprobe_events
 grep -qe "testprobe.* arg1=\"test\"" trace
 
 echo 0 > events/kprobes/testprobe/enable
 : "Test get argument (2)"
 echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):string arg2=+0(${ARG1}):string" > kprobe_events
 echo 1 > events/kprobes/testprobe/enable
-echo "p:test _do_fork" >> kprobe_events
+echo "p:test kernel_clone" >> kprobe_events
 grep -qe "testprobe.* arg1=\"test\" arg2=\"test\"" trace
 
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc
index b8c75a3d003c..bd25dd0ba0d0 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc
@@ -14,12 +14,12 @@ elif ! grep "$SYMBOL\$" /proc/kallsyms; then
 fi
 
 : "Test get basic types symbol argument"
-echo "p:testprobe_u _do_fork arg1=@linux_proc_banner:u64 arg2=@linux_proc_banner:u32 arg3=@linux_proc_banner:u16 arg4=@linux_proc_banner:u8" > kprobe_events
-echo "p:testprobe_s _do_fork arg1=@linux_proc_banner:s64 arg2=@linux_proc_banner:s32 arg3=@linux_proc_banner:s16 arg4=@linux_proc_banner:s8" >> kprobe_events
+echo "p:testprobe_u kernel_clone arg1=@linux_proc_banner:u64 arg2=@linux_proc_banner:u32 arg3=@linux_proc_banner:u16 arg4=@linux_proc_banner:u8" > kprobe_events
+echo "p:testprobe_s kernel_clone arg1=@linux_proc_banner:s64 arg2=@linux_proc_banner:s32 arg3=@linux_proc_banner:s16 arg4=@linux_proc_banner:s8" >> kprobe_events
 if grep -q "x8/16/32/64" README; then
-  echo "p:testprobe_x _do_fork arg1=@linux_proc_banner:x64 arg2=@linux_proc_banner:x32 arg3=@linux_proc_banner:x16 arg4=@linux_proc_banner:x8" >> kprobe_events
+  echo "p:testprobe_x kernel_clone arg1=@linux_proc_banner:x64 arg2=@linux_proc_banner:x32 arg3=@linux_proc_banner:x16 arg4=@linux_proc_banner:x8" >> kprobe_events
 fi
-echo "p:testprobe_bf _do_fork arg1=@linux_proc_banner:b8@4/32" >> kprobe_events
+echo "p:testprobe_bf kernel_clone arg1=@linux_proc_banner:b8@4/32" >> kprobe_events
 echo 1 > events/kprobes/enable
 (echo "forked")
 echo 0 > events/kprobes/enable
@@ -27,7 +27,7 @@ grep "testprobe_[usx]:.* arg1=.* arg2=.* arg3=.* arg4=.*" trace
 grep "testprobe_bf:.* arg1=.*" trace
 
 : "Test get string symbol argument"
-echo "p:testprobe_str _do_fork arg1=@linux_proc_banner:string" > kprobe_events
+echo "p:testprobe_str kernel_clone arg1=@linux_proc_banner:string" > kprobe_events
 echo 1 > events/kprobes/enable
 (echo "forked")
 echo 0 > events/kprobes/enable
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
index 0610e0b5587c..91fcce1c241c 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
@@ -4,7 +4,7 @@
 # requires: kprobe_events "x8/16/32/64":README
 
 gen_event() { # Bitsize
-  echo "p:testprobe _do_fork \$stack0:s$1 \$stack0:u$1 \$stack0:x$1 \$stack0:b4@4/$1"
+  echo "p:testprobe kernel_clone \$stack0:s$1 \$stack0:u$1 \$stack0:x$1 \$stack0:b4@4/$1"
 }
 
 check_types() { # s-type u-type x-type bf-type width
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
index 81d8b58c03bc..0d179094191f 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
@@ -5,29 +5,29 @@
 
 # prepare
 echo nop > current_tracer
-echo _do_fork > set_ftrace_filter
-echo 'p:testprobe _do_fork' > kprobe_events
+echo kernel_clone > set_ftrace_filter
+echo 'p:testprobe kernel_clone' > kprobe_events
 
 # kprobe on / ftrace off
 echo 1 > events/kprobes/testprobe/enable
 echo > trace
 ( echo "forked")
 grep testprobe trace
-! grep '_do_fork <-' trace
+! grep 'kernel_clone <-' trace
 
 # kprobe on / ftrace on
 echo function > current_tracer
 echo > trace
 ( echo "forked")
 grep testprobe trace
-grep '_do_fork <-' trace
+grep 'kernel_clone <-' trace
 
 # kprobe off / ftrace on
 echo 0 > events/kprobes/testprobe/enable
 echo > trace
 ( echo "forked")
 ! grep testprobe trace
-grep '_do_fork <-' trace
+grep 'kernel_clone <-' trace
 
 # kprobe on / ftrace on
 echo 1 > events/kprobes/testprobe/enable
@@ -35,11 +35,11 @@ echo function > current_tracer
 echo > trace
 ( echo "forked")
 grep testprobe trace
-grep '_do_fork <-' trace
+grep 'kernel_clone <-' trace
 
 # kprobe on / ftrace off
 echo nop > current_tracer
 echo > trace
 ( echo "forked")
 grep testprobe trace
-! grep '_do_fork <-' trace
+! grep 'kernel_clone <-' trace
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc
index 366b7e1b6718..45d90b6c763d 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc
@@ -4,7 +4,7 @@
 # requires: kprobe_events "Create/append/":README
 
 # Choose 2 symbols for target
-SYM1=_do_fork
+SYM1=kernel_clone
 SYM2=do_exit
 EVENT_NAME=kprobes/testevent
 
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
index b4d834675e59..c02ea50d63ea 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
@@ -86,15 +86,15 @@ esac
 
 # multiprobe errors
 if grep -q "Create/append/" README && grep -q "imm-value" README; then
-echo 'p:kprobes/testevent _do_fork' > kprobe_events
+echo 'p:kprobes/testevent kernel_clone' > kprobe_events
 check_error '^r:kprobes/testevent do_exit'	# DIFF_PROBE_TYPE
 
 # Explicitly use printf "%s" to not interpret \1
-printf "%s" 'p:kprobes/testevent _do_fork abcd=\1' > kprobe_events
-check_error 'p:kprobes/testevent _do_fork ^bcd=\1'	# DIFF_ARG_TYPE
-check_error 'p:kprobes/testevent _do_fork ^abcd=\1:u8'	# DIFF_ARG_TYPE
-check_error 'p:kprobes/testevent _do_fork ^abcd=\"foo"'	# DIFF_ARG_TYPE
-check_error '^p:kprobes/testevent _do_fork abcd=\1'	# SAME_PROBE
+printf "%s" 'p:kprobes/testevent kernel_clone abcd=\1' > kprobe_events
+check_error 'p:kprobes/testevent kernel_clone ^bcd=\1'	# DIFF_ARG_TYPE
+check_error 'p:kprobes/testevent kernel_clone ^abcd=\1:u8'	# DIFF_ARG_TYPE
+check_error 'p:kprobes/testevent kernel_clone ^abcd=\"foo"'	# DIFF_ARG_TYPE
+check_error '^p:kprobes/testevent kernel_clone abcd=\1'	# SAME_PROBE
 fi
 
 exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
index 523fde6d1aa5..7ae492c204a4 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
@@ -4,14 +4,14 @@
 # requires: kprobe_events
 
 # Add new kretprobe event
-echo 'r:testprobe2 _do_fork $retval' > kprobe_events
+echo 'r:testprobe2 kernel_clone $retval' > kprobe_events
 grep testprobe2 kprobe_events | grep -q 'arg1=\$retval'
 test -d events/kprobes/testprobe2
 
 echo 1 > events/kprobes/testprobe2/enable
 ( echo "forked")
 
-cat trace | grep testprobe2 | grep -q '<- _do_fork'
+cat trace | grep testprobe2 | grep -q '<- kernel_clone'
 
 echo 0 > events/kprobes/testprobe2/enable
 echo '-:testprobe2' >> kprobe_events
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/profile.tc b/tools/testing/selftests/ftrace/test.d/kprobe/profile.tc
index ff6c44adc8a0..c4093fc1a773 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/profile.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/profile.tc
@@ -4,7 +4,7 @@
 # requires: kprobe_events
 
 ! grep -q 'myevent' kprobe_profile
-echo p:myevent _do_fork > kprobe_events
+echo p:myevent kernel_clone > kprobe_events
 grep -q 'myevent[[:space:]]*0[[:space:]]*0$' kprobe_profile
 echo 1 > events/kprobes/myevent/enable
 ( echo "forked" )
-- 
2.28.0

Re: [PATCH v2 10/11] tracing: switch to kernel_clone()

[Masami Hiramatsu]

On Wed, 19 Aug 2020 12:46:54 +0200
Christian Brauner <christian.brauner@ubuntu.com> wrote:

> The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
> The latter adheres to naming conventions for kernel internal syscall helpers.
> 

This looks good to me.

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>

Thank you,

> Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> Cc: Alexandre Chartre <alexandre.chartre@oracle.com>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Masami Hiramatsu <mhiramat@kernel.org>
> Cc: Shuah Khan <shuah@kernel.org>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Cc: Xiao Yang <yangx.jy@cn.fujitsu.com>
> Cc: Tom Zanussi <zanussi@kernel.org>
> Cc: linux-doc@vger.kernel.org
> Cc: linux-kselftest@vger.kernel.org
> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
> ---
> /* v2 */
> unchanged
> ---
>  Documentation/trace/histogram.rst                  |  4 ++--
>  samples/kprobes/kretprobe_example.c                |  4 ++--
>  .../ftrace/test.d/dynevent/add_remove_kprobe.tc    |  2 +-
>  .../ftrace/test.d/dynevent/clear_select_events.tc  |  2 +-
>  .../ftrace/test.d/dynevent/generic_clear_event.tc  |  2 +-
>  .../ftrace/test.d/ftrace/func-filter-stacktrace.tc |  4 ++--
>  .../ftrace/test.d/kprobe/add_and_remove.tc         |  2 +-
>  .../selftests/ftrace/test.d/kprobe/busy_check.tc   |  2 +-
>  .../selftests/ftrace/test.d/kprobe/kprobe_args.tc  |  4 ++--
>  .../ftrace/test.d/kprobe/kprobe_args_comm.tc       |  2 +-
>  .../ftrace/test.d/kprobe/kprobe_args_string.tc     |  4 ++--
>  .../ftrace/test.d/kprobe/kprobe_args_symbol.tc     | 10 +++++-----
>  .../ftrace/test.d/kprobe/kprobe_args_type.tc       |  2 +-
>  .../ftrace/test.d/kprobe/kprobe_ftrace.tc          | 14 +++++++-------
>  .../ftrace/test.d/kprobe/kprobe_multiprobe.tc      |  2 +-
>  .../ftrace/test.d/kprobe/kprobe_syntax_errors.tc   | 12 ++++++------
>  .../ftrace/test.d/kprobe/kretprobe_args.tc         |  4 ++--
>  .../selftests/ftrace/test.d/kprobe/profile.tc      |  2 +-
>  18 files changed, 39 insertions(+), 39 deletions(-)
> 
> diff --git a/Documentation/trace/histogram.rst b/Documentation/trace/histogram.rst
> index 8408670d0328..f93333524a44 100644
> --- a/Documentation/trace/histogram.rst
> +++ b/Documentation/trace/histogram.rst
> @@ -1495,7 +1495,7 @@ Extended error information
>      #
>  
>      { stacktrace:
> -             _do_fork+0x18e/0x330
> +             kernel_clone+0x18e/0x330
>               kernel_thread+0x29/0x30
>               kthreadd+0x154/0x1b0
>               ret_from_fork+0x3f/0x70
> @@ -1588,7 +1588,7 @@ Extended error information
>               SYSC_sendto+0xef/0x170
>      } hitcount:         88
>      { stacktrace:
> -             _do_fork+0x18e/0x330
> +             kernel_clone+0x18e/0x330
>               SyS_clone+0x19/0x20
>               entry_SYSCALL_64_fastpath+0x12/0x6a
>      } hitcount:        244
> diff --git a/samples/kprobes/kretprobe_example.c b/samples/kprobes/kretprobe_example.c
> index 78a2da6fb3cd..0c40f7236989 100644
> --- a/samples/kprobes/kretprobe_example.c
> +++ b/samples/kprobes/kretprobe_example.c
> @@ -8,7 +8,7 @@
>   *
>   * usage: insmod kretprobe_example.ko func=<func_name>
>   *
> - * If no func_name is specified, _do_fork is instrumented
> + * If no func_name is specified, kernel_clone is instrumented
>   *
>   * For more information on theory of operation of kretprobes, see
>   * Documentation/staging/kprobes.rst
> @@ -26,7 +26,7 @@
>  #include <linux/limits.h>
>  #include <linux/sched.h>
>  
> -static char func_name[NAME_MAX] = "_do_fork";
> +static char func_name[NAME_MAX] = "kernel_clone";
>  module_param_string(func, func_name, NAME_MAX, S_IRUGO);
>  MODULE_PARM_DESC(func, "Function to kretprobe; this module will report the"
>  			" function's execution time");
> diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc
> index 68550f97d3c3..3bcd4c3624ee 100644
> --- a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc
> +++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_kprobe.tc
> @@ -6,7 +6,7 @@
>  echo 0 > events/enable
>  echo > dynamic_events
>  
> -PLACE=_do_fork
> +PLACE=kernel_clone
>  
>  echo "p:myevent1 $PLACE" >> dynamic_events
>  echo "r:myevent2 $PLACE" >> dynamic_events
> diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc b/tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc
> index c969be9eb7de..438961971b7e 100644
> --- a/tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc
> +++ b/tools/testing/selftests/ftrace/test.d/dynevent/clear_select_events.tc
> @@ -6,7 +6,7 @@
>  echo 0 > events/enable
>  echo > dynamic_events
>  
> -PLACE=_do_fork
> +PLACE=kernel_clone
>  
>  setup_events() {
>  echo "p:myevent1 $PLACE" >> dynamic_events
> diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc b/tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc
> index 16d543eaac88..a8603bd23e0d 100644
> --- a/tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc
> +++ b/tools/testing/selftests/ftrace/test.d/dynevent/generic_clear_event.tc
> @@ -6,7 +6,7 @@
>  echo 0 > events/enable
>  echo > dynamic_events
>  
> -PLACE=_do_fork
> +PLACE=kernel_clone
>  
>  setup_events() {
>  echo "p:myevent1 $PLACE" >> dynamic_events
> diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
> index 0f41e441c203..98305d76bd04 100644
> --- a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
> +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
> @@ -4,9 +4,9 @@
>  # requires: set_ftrace_filter
>  # flags: instance
>  
> -echo _do_fork:stacktrace >> set_ftrace_filter
> +echo kernel_clone:stacktrace >> set_ftrace_filter
>  
> -grep -q "_do_fork:stacktrace:unlimited" set_ftrace_filter
> +grep -q "kernel_clone:stacktrace:unlimited" set_ftrace_filter
>  
>  (echo "forked"; sleep 1)
>  
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc b/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
> index eba858c21815..9737cd0578a7 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/add_and_remove.tc
> @@ -3,7 +3,7 @@
>  # description: Kprobe dynamic event - adding and removing
>  # requires: kprobe_events
>  
> -echo p:myevent _do_fork > kprobe_events
> +echo p:myevent kernel_clone > kprobe_events
>  grep myevent kprobe_events
>  test -d events/kprobes/myevent
>  echo > kprobe_events
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc b/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
> index d10bf4f05bc8..f9a40af76888 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/busy_check.tc
> @@ -3,7 +3,7 @@
>  # description: Kprobe dynamic event - busy event check
>  # requires: kprobe_events
>  
> -echo p:myevent _do_fork > kprobe_events
> +echo p:myevent kernel_clone > kprobe_events
>  test -d events/kprobes/myevent
>  echo 1 > events/kprobes/myevent/enable
>  echo > kprobe_events && exit_fail # this must fail
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
> index 61f2ac441aec..eb543d3cfe5f 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args.tc
> @@ -3,13 +3,13 @@
>  # description: Kprobe dynamic event with arguments
>  # requires: kprobe_events
>  
> -echo 'p:testprobe _do_fork $stack $stack0 +0($stack)' > kprobe_events
> +echo 'p:testprobe kernel_clone $stack $stack0 +0($stack)' > kprobe_events
>  grep testprobe kprobe_events | grep -q 'arg1=\$stack arg2=\$stack0 arg3=+0(\$stack)'
>  test -d events/kprobes/testprobe
>  
>  echo 1 > events/kprobes/testprobe/enable
>  ( echo "forked")
> -grep testprobe trace | grep '_do_fork' | \
> +grep testprobe trace | grep 'kernel_clone' | \
>    grep -q 'arg1=0x[[:xdigit:]]* arg2=0x[[:xdigit:]]* arg3=0x[[:xdigit:]]*$'
>  
>  echo 0 > events/kprobes/testprobe/enable
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc
> index 05aaeed6987f..4e5b63be51c9 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_comm.tc
> @@ -5,7 +5,7 @@
>  
>  grep -A1 "fetcharg:" README | grep -q "\$comm" || exit_unsupported # this is too old
>  
> -echo 'p:testprobe _do_fork comm=$comm ' > kprobe_events
> +echo 'p:testprobe kernel_clone comm=$comm ' > kprobe_events
>  grep testprobe kprobe_events | grep -q 'comm=$comm'
>  test -d events/kprobes/testprobe
>  
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
> index b5fa05443b39..a1d70588ab21 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
> @@ -30,13 +30,13 @@ esac
>  : "Test get argument (1)"
>  echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):string" > kprobe_events
>  echo 1 > events/kprobes/testprobe/enable
> -echo "p:test _do_fork" >> kprobe_events
> +echo "p:test kernel_clone" >> kprobe_events
>  grep -qe "testprobe.* arg1=\"test\"" trace
>  
>  echo 0 > events/kprobes/testprobe/enable
>  : "Test get argument (2)"
>  echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):string arg2=+0(${ARG1}):string" > kprobe_events
>  echo 1 > events/kprobes/testprobe/enable
> -echo "p:test _do_fork" >> kprobe_events
> +echo "p:test kernel_clone" >> kprobe_events
>  grep -qe "testprobe.* arg1=\"test\" arg2=\"test\"" trace
>  
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc
> index b8c75a3d003c..bd25dd0ba0d0 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_symbol.tc
> @@ -14,12 +14,12 @@ elif ! grep "$SYMBOL\$" /proc/kallsyms; then
>  fi
>  
>  : "Test get basic types symbol argument"
> -echo "p:testprobe_u _do_fork arg1=@linux_proc_banner:u64 arg2=@linux_proc_banner:u32 arg3=@linux_proc_banner:u16 arg4=@linux_proc_banner:u8" > kprobe_events
> -echo "p:testprobe_s _do_fork arg1=@linux_proc_banner:s64 arg2=@linux_proc_banner:s32 arg3=@linux_proc_banner:s16 arg4=@linux_proc_banner:s8" >> kprobe_events
> +echo "p:testprobe_u kernel_clone arg1=@linux_proc_banner:u64 arg2=@linux_proc_banner:u32 arg3=@linux_proc_banner:u16 arg4=@linux_proc_banner:u8" > kprobe_events
> +echo "p:testprobe_s kernel_clone arg1=@linux_proc_banner:s64 arg2=@linux_proc_banner:s32 arg3=@linux_proc_banner:s16 arg4=@linux_proc_banner:s8" >> kprobe_events
>  if grep -q "x8/16/32/64" README; then
> -  echo "p:testprobe_x _do_fork arg1=@linux_proc_banner:x64 arg2=@linux_proc_banner:x32 arg3=@linux_proc_banner:x16 arg4=@linux_proc_banner:x8" >> kprobe_events
> +  echo "p:testprobe_x kernel_clone arg1=@linux_proc_banner:x64 arg2=@linux_proc_banner:x32 arg3=@linux_proc_banner:x16 arg4=@linux_proc_banner:x8" >> kprobe_events
>  fi
> -echo "p:testprobe_bf _do_fork arg1=@linux_proc_banner:b8@4/32" >> kprobe_events
> +echo "p:testprobe_bf kernel_clone arg1=@linux_proc_banner:b8@4/32" >> kprobe_events
>  echo 1 > events/kprobes/enable
>  (echo "forked")
>  echo 0 > events/kprobes/enable
> @@ -27,7 +27,7 @@ grep "testprobe_[usx]:.* arg1=.* arg2=.* arg3=.* arg4=.*" trace
>  grep "testprobe_bf:.* arg1=.*" trace
>  
>  : "Test get string symbol argument"
> -echo "p:testprobe_str _do_fork arg1=@linux_proc_banner:string" > kprobe_events
> +echo "p:testprobe_str kernel_clone arg1=@linux_proc_banner:string" > kprobe_events
>  echo 1 > events/kprobes/enable
>  (echo "forked")
>  echo 0 > events/kprobes/enable
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
> index 0610e0b5587c..91fcce1c241c 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
> @@ -4,7 +4,7 @@
>  # requires: kprobe_events "x8/16/32/64":README
>  
>  gen_event() { # Bitsize
> -  echo "p:testprobe _do_fork \$stack0:s$1 \$stack0:u$1 \$stack0:x$1 \$stack0:b4@4/$1"
> +  echo "p:testprobe kernel_clone \$stack0:s$1 \$stack0:u$1 \$stack0:x$1 \$stack0:b4@4/$1"
>  }
>  
>  check_types() { # s-type u-type x-type bf-type width
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
> index 81d8b58c03bc..0d179094191f 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_ftrace.tc
> @@ -5,29 +5,29 @@
>  
>  # prepare
>  echo nop > current_tracer
> -echo _do_fork > set_ftrace_filter
> -echo 'p:testprobe _do_fork' > kprobe_events
> +echo kernel_clone > set_ftrace_filter
> +echo 'p:testprobe kernel_clone' > kprobe_events
>  
>  # kprobe on / ftrace off
>  echo 1 > events/kprobes/testprobe/enable
>  echo > trace
>  ( echo "forked")
>  grep testprobe trace
> -! grep '_do_fork <-' trace
> +! grep 'kernel_clone <-' trace
>  
>  # kprobe on / ftrace on
>  echo function > current_tracer
>  echo > trace
>  ( echo "forked")
>  grep testprobe trace
> -grep '_do_fork <-' trace
> +grep 'kernel_clone <-' trace
>  
>  # kprobe off / ftrace on
>  echo 0 > events/kprobes/testprobe/enable
>  echo > trace
>  ( echo "forked")
>  ! grep testprobe trace
> -grep '_do_fork <-' trace
> +grep 'kernel_clone <-' trace
>  
>  # kprobe on / ftrace on
>  echo 1 > events/kprobes/testprobe/enable
> @@ -35,11 +35,11 @@ echo function > current_tracer
>  echo > trace
>  ( echo "forked")
>  grep testprobe trace
> -grep '_do_fork <-' trace
> +grep 'kernel_clone <-' trace
>  
>  # kprobe on / ftrace off
>  echo nop > current_tracer
>  echo > trace
>  ( echo "forked")
>  grep testprobe trace
> -! grep '_do_fork <-' trace
> +! grep 'kernel_clone <-' trace
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc
> index 366b7e1b6718..45d90b6c763d 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_multiprobe.tc
> @@ -4,7 +4,7 @@
>  # requires: kprobe_events "Create/append/":README
>  
>  # Choose 2 symbols for target
> -SYM1=_do_fork
> +SYM1=kernel_clone
>  SYM2=do_exit
>  EVENT_NAME=kprobes/testevent
>  
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
> index b4d834675e59..c02ea50d63ea 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
> @@ -86,15 +86,15 @@ esac
>  
>  # multiprobe errors
>  if grep -q "Create/append/" README && grep -q "imm-value" README; then
> -echo 'p:kprobes/testevent _do_fork' > kprobe_events
> +echo 'p:kprobes/testevent kernel_clone' > kprobe_events
>  check_error '^r:kprobes/testevent do_exit'	# DIFF_PROBE_TYPE
>  
>  # Explicitly use printf "%s" to not interpret \1
> -printf "%s" 'p:kprobes/testevent _do_fork abcd=\1' > kprobe_events
> -check_error 'p:kprobes/testevent _do_fork ^bcd=\1'	# DIFF_ARG_TYPE
> -check_error 'p:kprobes/testevent _do_fork ^abcd=\1:u8'	# DIFF_ARG_TYPE
> -check_error 'p:kprobes/testevent _do_fork ^abcd=\"foo"'	# DIFF_ARG_TYPE
> -check_error '^p:kprobes/testevent _do_fork abcd=\1'	# SAME_PROBE
> +printf "%s" 'p:kprobes/testevent kernel_clone abcd=\1' > kprobe_events
> +check_error 'p:kprobes/testevent kernel_clone ^bcd=\1'	# DIFF_ARG_TYPE
> +check_error 'p:kprobes/testevent kernel_clone ^abcd=\1:u8'	# DIFF_ARG_TYPE
> +check_error 'p:kprobes/testevent kernel_clone ^abcd=\"foo"'	# DIFF_ARG_TYPE
> +check_error '^p:kprobes/testevent kernel_clone abcd=\1'	# SAME_PROBE
>  fi
>  
>  exit 0
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
> index 523fde6d1aa5..7ae492c204a4 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_args.tc
> @@ -4,14 +4,14 @@
>  # requires: kprobe_events
>  
>  # Add new kretprobe event
> -echo 'r:testprobe2 _do_fork $retval' > kprobe_events
> +echo 'r:testprobe2 kernel_clone $retval' > kprobe_events
>  grep testprobe2 kprobe_events | grep -q 'arg1=\$retval'
>  test -d events/kprobes/testprobe2
>  
>  echo 1 > events/kprobes/testprobe2/enable
>  ( echo "forked")
>  
> -cat trace | grep testprobe2 | grep -q '<- _do_fork'
> +cat trace | grep testprobe2 | grep -q '<- kernel_clone'
>  
>  echo 0 > events/kprobes/testprobe2/enable
>  echo '-:testprobe2' >> kprobe_events
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/profile.tc b/tools/testing/selftests/ftrace/test.d/kprobe/profile.tc
> index ff6c44adc8a0..c4093fc1a773 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/profile.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/profile.tc
> @@ -4,7 +4,7 @@
>  # requires: kprobe_events
>  
>  ! grep -q 'myevent' kprobe_profile
> -echo p:myevent _do_fork > kprobe_events
> +echo p:myevent kernel_clone > kprobe_events
>  grep -q 'myevent[[:space:]]*0[[:space:]]*0$' kprobe_profile
>  echo 1 > events/kprobes/myevent/enable
>  ( echo "forked" )
> -- 
> 2.28.0
> 


-- 
Masami Hiramatsu <mhiramat@kernel.org>

[PATCH v2 11/11] sched: remove _do_fork()

[Christian Brauner]

Now that all callers of _do_fork() have been switched to kernel_clone() remove
the _do_fork() helper.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
unchanged
---
 include/linux/sched/task.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index d4428039c3c1..85fb2f34c59b 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -84,10 +84,6 @@ extern void exit_files(struct task_struct *);
 extern void exit_itimers(struct signal_struct *);
 
 extern pid_t kernel_clone(struct kernel_clone_args *kargs);
-static inline long _do_fork(struct kernel_clone_args *kargs)
-{
-	return kernel_clone(kargs);
-}
 struct task_struct *fork_idle(int);
 struct mm_struct *copy_init_mm(void);
 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-- 
2.28.0