On Mon, 9 Feb 2026 14:41:51 +0100, Christophe Leroy (CS GROUP) wrote:
> Le 09/02/2026 ?? 14:25, Xie Yuanbin a ??crit :
>> On Fri, 6 Feb 2026 20:53:55 +0100, Christophe Leroy (CS GROUP) wrote:
>>> ppc_kallsyms_lookup_name() only has two callers and they call it with a
>>> built-in string. I think we can do something a lot simpler, something
>>> like (untested):
>>>
>>> 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;
>>> }
>>>
>>> #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
>>>
>>> Christophe
>>
>> 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
This seems good, but there seems to be an extra ';' after
'__ppc_kallsyms_lookup_name("." x)' ?
After removing the extra ';', I performed a compilation test,
no warnings.
