[PATCH V3] powerpc/bug: Add ARCH_WARN_ASM and refactor _EMIT_BUG_ENTRY for Rust support

[Mukesh Kumar Chaurasiya]

On Thu, Sep 10, 2026 at 05:08:48PM +0200, Christophe Leroy (CS GROUP) wrote:
> 
[...]
> > -/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
> > -   sizeof(struct bug_entry), respectively */
> >   #ifdef CONFIG_DEBUG_BUGVERBOSE
> > -#define _EMIT_BUG_ENTRY				\
> > -	".section __bug_table,\"aw\"\n"		\
> > -	"2:	.4byte 1b - .\n"		\
> > -	"	.4byte %0 - .\n"		\
> > -	"	.short %1, %2\n"		\
> > -	".org 2b+%3\n"				\
> > -	".previous\n"
> > +#define _EMIT_BUG_ENTRY(label, file, line, flags)	\
> > +	".section __bug_table,\"aw\"\n"			\
> > +	"2:	.4byte " label "b - .\n"		\
> 
> Ah, you left the b here. The label is 1b which mean "the first 1: you find
> going backward". Could as well be "1f" instead meaning "the first 1: you
> find going forward".
> 
> So I think you should use 1b or 1f as the label, not just 1.
Hey Christophe,

Thanks for the clear explanation, this helps a lot.
> 
> I would also try to use #label to stringigy the label in order to avoid
> having to put the arguments into quotes (untested), same for other ones.
> 
Ohk, letme try that.

> Cdlt
> Christophe
> 

Regards,
Mukesh
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