Re: [PATCH v1 1/1] arm64: remove unnecessary ifdefs around is_compat_task()

["Arnd Bergmann" <arnd@arndb.de>]

On Fri, Jan 5, 2024, at 14:14, Mark Rutland wrote:
> On Fri, Jan 05, 2024 at 01:15:00AM -0300, Leonardo Bras wrote:
> arch/arm64/kernel/ptrace.c:2121:25: note: each undeclared identifier is 
> reported only once for each function it appears in
> arch/arm64/kernel/ptrace.c:2123:25: error: 'user_aarch32_ptrace_view' 
> undeclared (first use in this function)
>  2123 |                 return &user_aarch32_ptrace_view;
>       |                         ^~~~~~~~~~~~~~~~~~~~~~~~
> make[4]: *** [scripts/Makefile.build:243: arch/arm64/kernel/ptrace.o] 
> Error 1
> make[3]: *** [scripts/Makefile.build:480: arch/arm64/kernel] Error 2
> make[2]: *** [scripts/Makefile.build:480: arch/arm64] Error 2
> make[1]: *** [/home/mark/src/linux/Makefile:1911: .] Error 2
> make: *** [Makefile:234: __sub-make] Error 2
>
> ... and looking at the code, user_aarch32_view and user_aarch32_ptrace_view are
> both defined under ifdeffery for CONFIG_COMPAT, so that's obviously not going
> to work...

I suspect it's enough to remove all of the other
"#ifdef CONFIG_COMPAT" checks in this file and rely on
dead code elimination to remove the rest, but there might
be additional problems if some extern declarations are
hidden in an #ifdef as well.

    Arnd