linux-kernel - Re: [PATCH v2 3/7] ftrace: Expose __ftrace_replace

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Message-ID: <20190627103636.21122b0d@gandalf.local.home>
Date:   Thu, 27 Jun 2019 10:36:36 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/7] ftrace: Expose __ftrace_replace_code()

On Thu, 27 Jun 2019 16:53:51 +0530
"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> wrote:

> While over-riding ftrace_replace_code(), we still want to reuse the
> existing __ftrace_replace_code() function. Rename the function and
> make it available for other kernel code.
> 
> Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> ---
>  include/linux/ftrace.h | 1 +
>  kernel/trace/ftrace.c  | 8 ++++----
>  2 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
> index e97789c95c4e..fa653a561da5 100644
> --- a/include/linux/ftrace.h
> +++ b/include/linux/ftrace.h
> @@ -456,6 +456,7 @@ ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
>  /* defined in arch */
>  extern int ftrace_ip_converted(unsigned long ip);
>  extern int ftrace_dyn_arch_init(void);
> +extern int ftrace_replace_code_rec(struct dyn_ftrace *rec, int enable);
>  extern void ftrace_replace_code(int enable);
>  extern int ftrace_update_ftrace_func(ftrace_func_t func);
>  extern void ftrace_caller(void);
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 5710a6b3edc1..21d8e201ee80 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -2351,8 +2351,8 @@ unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec)
>  		return (unsigned long)FTRACE_ADDR;
>  }
>  
> -static int
> -__ftrace_replace_code(struct dyn_ftrace *rec, int enable)
> +int
> +ftrace_replace_code_rec(struct dyn_ftrace *rec, int enable)

Make this a single line, as it removes static and "__" which should
keep it normal.

Other than that,

Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve


>  {
>  	unsigned long ftrace_old_addr;
>  	unsigned long ftrace_addr;
> @@ -2403,7 +2403,7 @@ void __weak ftrace_replace_code(int mod_flags)
>  		if (rec->flags & FTRACE_FL_DISABLED)
>  			continue;
>  
> -		failed = __ftrace_replace_code(rec, enable);
> +		failed = ftrace_replace_code_rec(rec, enable);
>  		if (failed) {
>  			ftrace_bug(failed, rec);
>  			/* Stop processing */
> @@ -5827,7 +5827,7 @@ void ftrace_module_enable(struct module *mod)
>  		rec->flags = cnt;
>  
>  		if (ftrace_start_up && cnt) {
> -			int failed = __ftrace_replace_code(rec, 1);
> +			int failed = ftrace_replace_code_rec(rec, 1);
>  			if (failed) {
>  				ftrace_bug(failed, rec);
>  				goto out_loop;