Le 18/05/2022 à 13:19, Michael Ellerman a écrit :
> "Naveen N. Rao" <naveen.n....@linux.vnet.ibm.com> writes:
>> Christophe Leroy wrote:
>>> A lot of #ifdefs can be replaced by IS_ENABLED()
>>>
>>> Do so.
>>>
>>> This requires to have kernel_toc_addr() defined at all time
>>> as well as PPC_INST_LD_TOC and PPC_INST_STD_LR.
>>>
>>> Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
>>> ---
>>> v2: Moved the setup of pop outside of the big if()/else() in
>>> __ftrace_make_nop()
>>> ---
>>> arch/powerpc/include/asm/code-patching.h | 2 -
>>> arch/powerpc/include/asm/module.h | 2 -
>>> arch/powerpc/include/asm/sections.h | 24 +--
>>> arch/powerpc/kernel/trace/ftrace.c | 182 +++++++++++------------
>>> 4 files changed, 103 insertions(+), 107 deletions(-)
>>>
>>
>> <snip>
>>
>>> @@ -710,6 +707,9 @@ void arch_ftrace_update_code(int command)
>>>
>>> #ifdef CONFIG_PPC64
>>> #define PACATOC offsetof(struct paca_struct, kernel_toc)
>>> +#else
>>> +#define PACATOC 0
>>> +#endif
>>
>> This conflicts with my fix for the ftrace init tramp:
>> https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20220516071422.463738-1-naveen.n....@linux.vnet.ibm.com/
>>
>> It probably makes sense to retain #ifdef CONFIG_PPC64, so that we can
>> get rid of the PACATOC. Here is an incremental diff:
>
> Where is the incremental diff meant to apply?
>
> It doesn't apply on top of patch 19, or at the end of the series.
White space damage it seems.
I'll send you a proper fixup for that patch in a few minutes.
>
> cheers
>
>> diff --git a/arch/powerpc/kernel/trace/ftrace.c
>> b/arch/powerpc/kernel/trace/ftrace.c
>> index da1a2f8ebb72f3..28169a1ccc7377 100644
>> --- a/arch/powerpc/kernel/trace/ftrace.c
>> +++ b/arch/powerpc/kernel/trace/ftrace.c
>> @@ -701,11 +701,6 @@ void arch_ftrace_update_code(int command)
>> }
>>
>> #ifdef CONFIG_PPC64
>> -#define PACATOC offsetof(struct paca_struct, kernel_toc)
>> -#else
>> -#define PACATOC 0
>> -#endif
>> -
>> extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[];
>>
>> void ftrace_free_init_tramp(void)
>> @@ -724,7 +719,7 @@ int __init ftrace_dyn_arch_init(void)
>> int i;
>> unsigned int *tramp[] = { ftrace_tramp_text, ftrace_tramp_init };
>> u32 stub_insns[] = {
>> - PPC_RAW_LD(_R12, _R13, PACATOC),
>> + PPC_RAW_LD(_R12, _R13, offsetof(struct paca_struct,
>> kernel_toc)),
>> PPC_RAW_ADDIS(_R12, _R12, 0),
>> PPC_RAW_ADDI(_R12, _R12, 0),
>> PPC_RAW_MTCTR(_R12),
>> @@ -733,9 +728,6 @@ int __init ftrace_dyn_arch_init(void)
>> unsigned long addr;
>> long reladdr;
>>
>> - if (IS_ENABLED(CONFIG_PPC32))
>> - return 0;
>> -
>> addr = ppc_global_function_entry((void *)FTRACE_REGS_ADDR);
>> reladdr = addr - kernel_toc_addr();
>>
>> @@ -754,6 +746,7 @@ int __init ftrace_dyn_arch_init(void)
>>
>> return 0;
>> }
>> +#endif
>>
>> #ifdef CONFIG_FUNCTION_GRAPH_TRACER
>>
>>
>> - Naveen
