Re: [RFC PATCH] m68k: Avoid CONFIG_COLDFIRE switch in uapi header

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On Fri, Nov 10, 2023, at 11:31, 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. Let's use the __mcoldfire__ switch from the
compiler here instead.

Signed-off-by: Thomas Huth <thuth@xxxxxxxxxx>
---
 Marked as RFC since I didn't test it - I'd appreciate if someone
 could give it a try on a real system.

 arch/m68k/include/uapi/asm/ptrace.h | 2 +-
 scripts/headers_install.sh          | 1 -
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/m68k/include/uapi/asm/ptrace.h 
b/arch/m68k/include/uapi/asm/ptrace.h
index 5b50ea592e00..ebd9fccb3d11 100644
--- a/arch/m68k/include/uapi/asm/ptrace.h
+++ b/arch/m68k/include/uapi/asm/ptrace.h
@@ -39,7 +39,7 @@ struct pt_regs {
   long     d0;
   long     orig_d0;
   long     stkadj;
-#ifdef CONFIG_COLDFIRE
+#ifdef __mcoldfire__
   unsigned format :  4; /* frame format specifier */
   unsigned vector : 12; /* vector offset */
   unsigned short sr;

I think this should be harmless, but I'm not sure we even
need the structure in a uapi header: about half the architectures
define this in a user-visible way, while the others don't.

On csky, powerpc and microblaze, pt_regs is used inside
of the 'struct sigcontext' definition, but I don't think
this was ever the case on m68k.

The other one that is accessed in userspace is 'struct
user_regs_struct', but this one is actually not in the
uapi headers on m68k or x86.

     Arnd



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