linux-kernel - Re: [PATCH v2] m68k: Avoid CONFIG

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Date: Fri, 23 Feb 2024 09:13:03 +0100
From: Thomas Huth <thuth@...hat.com>
To: Arnd Bergmann <arnd@...db.de>, Greg Ungerer <gerg@...ux-m68k.org>,
 linux-m68k@...ts.linux-m68k.org, Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH v2] m68k: Avoid CONFIG_COLDFIRE switch in uapi header

On 20/02/2024 16.09, Arnd Bergmann wrote:
> On Tue, Feb 20, 2024, at 15:13, Greg Ungerer wrote:
>> On 20/2/24 02:01, Thomas Huth wrote:
>>> We should not use any CONFIG switches in uapi headers since these
>>> only work during kernel compilation; they are not defined for
>>> userspace. Fix it by moving the struct pt_regs to the kernel-internal
>>> header instead - struct pt_regs does not seem to be required for
>>> the userspace headers on m68k at all.
>>>
>>> Suggested-by: Greg Ungerer <gerg@...ux-m68k.org>
>>> Signed-off-by: Thomas Huth <thuth@...hat.com>
>>> ---
>>>    v2: Move the struct instead of changing the #ifdef
>>>
>>>    See previous discussion here:
>>>    https://lore.kernel.org/lkml/6e3f2a2e-2430-4b4f-9ead-d9a4d5e42713@linux-m68k.org/
>>
>> I am fine with this. FWIW the following architectures do
>> not define pt_regs in their uapi/ptrace.h header either:
>> arc, arm64, loongarch, nios2, openrisc, riscv, s390, xtensa
>> Though quite a few of them have a user_pt_regs instead.
>>
>> So for me:
>>
>> Acked-by: Greg Ungerer <gerg@...ux-m68k.org>
>>
>> Geert, Arnd, do you have any thoughts on this?
> 
> It clearly doesn't change the ABI, so that part is fine.
> 
> If asm/ptrace.h is included by some userspace tool to
> get the definition, it might cause a compile-time error
> that needs a trivial source change.
> 
> This could be needed for ptrace (gdb, strace) or signal
> handling and setjmp (libc), though it's more likely that these
> already have their own copies.

If we still feel unsure, we should maybe rather go with v1:

  https://lore.kernel.org/lkml/20231110103120.387517-1-thuth@redhat.com/

?

  Thomas