[PATCH kernel] powerpc/llvm/lto: Allow LLVM LTO builds

[Alexey Kardashevskiy]

On 5/4/22 07:24, Nick Desaulniers wrote:
> On Thu, Apr 28, 2022 at 11:46 PM Alexey Kardashevskiy <aik at ozlabs.ru> wrote:
>>
>> diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
>> index b66dd6f775a4..5b783bd51260 100644
>> --- a/arch/powerpc/kernel/exceptions-64s.S
>> +++ b/arch/powerpc/kernel/exceptions-64s.S
>> @@ -476,9 +476,11 @@ DEFINE_FIXED_SYMBOL(\name\()_common_real, text)
>>                  .if IHSRR_IF_HVMODE
>>                  BEGIN_FTR_SECTION
>>                  bne     masked_Hinterrupt
>> +               b       4f
>>                  FTR_SECTION_ELSE
> 
> Do you need to have the ELSE even if there's nothing in it; should it
> have a nop?  The rest of the assembler changes LGTM, but withholding
> RB tag until we have Kconfig dependencies in better shape.


The FTR patcher will add the necessary amount of "nop"s there and 
dropping "FTR_SECTION_ELSE" breaks the build as it does some 
"pushsection" magic.


> 
>> -               bne     masked_interrupt
>>                  ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
>> +               bne     masked_interrupt
>> +4:
>>                  .elseif IHSRR
>>                  bne     masked_Hinterrupt
>>                  .else
>