linux-kernel - Re: [PATCH] tracing: Use linker magic instead of recasting ftrace_ops_list

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Date:   Thu, 18 Jun 2020 12:41:57 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Jann Horn <jannh@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Oscar Carter <oscar.carter@....com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] tracing: Use linker magic instead of recasting
 ftrace_ops_list_func()

On Thu, 18 Jun 2020 01:12:37 +0200
Jann Horn <jannh@...gle.com> wrote:

> static ftrace_func_t ftrace_ops_get_list_func(struct ftrace_ops *ops)
> +static ftrace_asm_func_t ftrace_ops_get_list_func(struct ftrace_ops *ops)
>  {
> +#if FTRACE_FORCE_LIST_FUNC
> +       return ftrace_ops_list_func;
> +#else
>         /*
>          * If this is a dynamic, RCU, or per CPU ops, or we force list func,
>          * then it needs to call the list anyway.
>          */
> -       if (ops->flags & (FTRACE_OPS_FL_DYNAMIC | FTRACE_OPS_FL_RCU) ||
> -           FTRACE_FORCE_LIST_FUNC)
> +       if (ops->flags & (FTRACE_OPS_FL_DYNAMIC | FTRACE_OPS_FL_RCU))
>                 return ftrace_ops_list_func;
> 
>         return ftrace_ops_get_func(ops);

But ftrace_ops_get_func() returns ftrace_func_t type, wont this complain?

-- Steve


> +#endif
>  }