Re: [PATCH 8/9] target/ppc: silence the compiler warnings

[Thomas Huth <thuth@redhat.com>]

On 28/10/2020 10.56, Philippe Mathieu-Daudé wrote:
> On 10/28/20 5:18 AM, Chen Qun wrote:
>> When using -Wimplicit-fallthrough in our CFLAGS, the compiler showed warning:
>> target/ppc/mmu_helper.c: In function ‘dump_mmu’:
>> target/ppc/mmu_helper.c:1351:12: warning: this statement may fall through [-Wimplicit-fallthrough=]
>>  1351 |         if (ppc64_v3_radix(env_archcpu(env))) {
>>       |            ^
>> target/ppc/mmu_helper.c:1358:5: note: here
>>  1358 |     default:
>>       |     ^~~~~~~
>>
>> Add the corresponding "fall through" comment to fix it.
>>
>> Reported-by: Euler Robot <euler.robot@huawei.com>
>> Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
>> ---
>> Cc: David Gibson <david@gibson.dropbear.id.au>
>> ---
>>  target/ppc/mmu_helper.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/target/ppc/mmu_helper.c b/target/ppc/mmu_helper.c
>> index 8972714775..51749b62df 100644
>> --- a/target/ppc/mmu_helper.c
>> +++ b/target/ppc/mmu_helper.c
>> @@ -1355,6 +1355,7 @@ void dump_mmu(CPUPPCState *env)
>>              break;
>>          }
>>  #endif
>> +        /* fall through */
> 
> I'm surprise the compiler emit a warning for missing comment,
> but don't emit one for superfluous and confusing ones (when
> building a ppc32-only target). You'd need to put this before
> the #endif.
> 
> But instead of this band-aid to silent warning, replace the
> TODO by a LOG_UNIMP call, and add a break before the #endif.

+1 for replacing the TODO with a LOG_UNIMP call and adding a break instead,
that would look way less messy than the current code.

 Thanks,
  Thomas