Re: [PATCH 2/2] powerpc/text-patching: Fix possible stringop-overread compilation error

[Xie Yuanbin]

Hi, Christophe Leroy!

On Mon, 9 Feb 2026 14:41:51 +0100, Christophe Leroy (CS GROUP) wrote:
> On 09/02/2026 14:25, Xie Yuanbin wrote:
>> When CONFIG_PPC64_ELF_ABI_V1=y, it seems that the try of lookupinp
>> the original non-dot symbol is missing.
>>
>> What about this (Only the compilation test is performed):
>> ```c
>> static inline unsigned long __ppc_kallsyms_lookup_name(const char *name)
>> {
>> 	unsigned long addr = kallsyms_lookup_name(name);
>>
>> 	if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V2) && addr)
>> 		addr = ppc_function_entry((void *)addr);
>>
>> 	return addr;
>> }
>>
>> #define ppc_kallsyms_lookup_name(x) ({					\
>> 		unsigned long addr = 0;					\
>> 		if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V1))		\
>> 			addr = __ppc_kallsyms_lookup_name("." x);	\
>> 		if (!addr)						\
>> 			addr = __ppc_kallsyms_lookup_name(x);		\
>> 		addr;							\
>> 	})
>> ```
>
> Good point.
>
> To avoid duplicating the string I'd suggest:
>
> static inline unsigned long __ppc_kallsyms_lookup_name(const char *name)
> {
> 	unsigned long addr = kallsyms_lookup_name(name);
>
> 	if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V1) && !addr)
> 		addr = kallsyms_lookup_name(name + 1);
> 	if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V2) && addr)
> 		addr = ppc_function_entry((void *)addr);
>
> 	return addr;
> }
>
> #ifdef CONFIG_PPC64_ELF_ABI_V1
> #define ppc_kallsyms_lookup_name(x)	__ppc_kallsyms_lookup_name("." x);
> #else
> #define ppc_kallsyms_lookup_name(x)	__ppc_kallsyms_lookup_name(x)
> #endif

I would like to submit the modification as a new patch, and include you
as Co-developer. Do you agree?

Full of the patch:
```patch