linux-kernel - Re: [PATCH] net: stmmac: xgmac: fix initializer element is not constant error

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Date: Wed, 14 Feb 2024 22:07:58 +0000
From: Mark O'Donovan <shiftee@...teo.net>
To: Jacob Keller <jacob.e.keller@...el.com>, linux-kernel@...r.kernel.org
Cc: alexandre.torgue@...s.st.com, joabreu@...opsys.com, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 mcoquelin.stm32@...il.com, netdev@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] net: stmmac: xgmac: fix initializer element is not
 constant error

On 14/02/2024 20:31, Jacob Keller wrote:
> 
> 
> On 2/12/2024 7:43 AM, Mark O'Donovan wrote:
>> GCC prior to 8.x gives an "initializer element is not constant"
>> error for the uses of dpp_tx_err in dwxgmac3_dma_dpp_errors.
>> Newer compilers accept either version.
>>
>> More info here:
>> https://lore.kernel.org/all/20240103-fix-bq24190_charger-vbus_desc-non-const-v1-1-115ddf798c70@kernel.org
>>
>> Signed-off-by: Mark O'Donovan <shiftee@...teo.net>
>> ---
> 
> I'm not sure whether the Linux kernel project has an explicit cutoff for
> what versions of GCC (or other compilers) are supported. GCC 8 was first
> released in 2018.
> 
> The fix provided here is fairly straight forward, and while I do think
> the benefit of using builtin types vs using the macros is nice, I don't
> see that as a strong enough reason to hold up supporting the older compiler.
> 
> Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
> 
>>   drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
>> index 323c57f03c93..c02c035b81c0 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
>> @@ -830,8 +830,8 @@ static const struct dwxgmac3_error_desc dwxgmac3_dma_errors[32]= {
>>   	{ false, "UNKNOWN", "Unknown Error" }, /* 31 */
>>   };
>>   
>> -static const char * const dpp_rx_err = "Read Rx Descriptor Parity checker Error";
>> -static const char * const dpp_tx_err = "Read Tx Descriptor Parity checker Error";
>> +#define dpp_rx_err "Read Rx Descriptor Parity checker Error"
>> +#define dpp_tx_err "Read Tx Descriptor Parity checker Error"
>>   static const struct dwxgmac3_error_desc dwxgmac3_dma_dpp_errors[32] = {
>>   	{ true, "TDPES0", dpp_tx_err },
>>   	{ true, "TDPES1", dpp_tx_err },
>>
>> base-commit: 841c35169323cd833294798e58b9bf63fa4fa1de

Thanks Jacob.

The minimum versions for compilers and other tools are documented here:
https://www.kernel.org/doc/html/latest/process/changes.html

I am using a SLES 15 server to build, the first version of which came out in 2017.

Mark