linux-kernel - Re: [PATCH][next] ftrace: Fix -Wcast-function-type warnings on powerpc64

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Date:   Tue, 5 Oct 2021 12:51:32 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] ftrace: Fix -Wcast-function-type warnings on
 powerpc64

On Tue, 5 Oct 2021 11:50:27 -0500
"Gustavo A. R. Silva" <gustavoars@...nel.org> wrote:

> Nop; there are still some warnings (ppc64_defconfig):

Thanks, I'll take a look, and compile it against ppc64_defconfig.

-- Steve

> 
> kernel/trace/ftrace.c: In function ‘ftrace_ops_get_list_func’:
> kernel/trace/ftrace.c:171:10: error: returning ‘void (*)(long unsigned int,  long unsigned int,  struct ftrace_ops *, struct ftrace_regs *)’ from a function with incompatible return type ‘ftrace_func_t’ {aka ‘void (*)(long unsigned int,  long unsigned int)’} [-Werror=incompatible-pointer-types]
>   171 |   return ftrace_ops_list_func;
>       |          ^~~~~~~~~~~~~~~~~~~~
> kernel/trace/ftrace.c: In function ‘update_ftrace_function’:
> kernel/trace/ftrace.c:204:8: error: assignment to ‘ftrace_func_t’ {aka ‘void (*)(long unsigned int,  long unsigned int)’} from incompatible pointer type ‘void (*)(long unsigned int,  long unsigned int,  struct ftrace_ops *, struct ftrace_regs *)’ [-Werror=incompatible-pointer-types]
>   204 |   func = ftrace_ops_list_func;
>       |        ^
> kernel/trace/ftrace.c:217:11: warning: comparison of distinct pointer types lacks a cast
>   217 |  if (func == ftrace_ops_list_func) {
>       |           ^~
> kernel/trace/ftrace.c: In function ‘ftrace_modify_all_code’:
> kernel/trace/ftrace.c:2695:35: error: passing argument 1 of ‘ftrace_update_ftrace_func’ from incompatible pointer type [-Werror=incompatible-pointer-types]
>  2695 |   err = ftrace_update_ftrace_func(ftrace_ops_list_func);
>       |                                   ^~~~~~~~~~~~~~~~~~~~
>       |                                   |
>       |                                   void (*)(long unsigned int,  long unsigned int,  struct ftrace_ops *, struct ftrace_regs *)
> In file included from kernel/trace/ftrace.c:29:
> ./include/linux/ftrace.h:585:52: note: expected ‘ftrace_func_t’ {aka ‘void (*)(long unsigned int,  long unsigned int)’} but argument is of type ‘void (*)(long unsigned int,  long unsigned int,  struct ftrace_ops *, struct ftrace_regs *)’
>   585 | extern int ftrace_update_ftrace_func(ftrace_func_t func);
>       |                                      ~~~~~~~~~~~~~~^~~~
> kernel/trace/ftrace.c:2705:38: warning: comparison of distinct pointer types lacks a cast
>  2705 |  if (update && ftrace_trace_function != ftrace_ops_list_func) {
>       |                                      ^~