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

From: Jacob Keller <jacob.e.keller@intel.com>
To: Mark O'Donovan <shiftee@posteo.net>, <linux-kernel@vger.kernel.org>
Cc: <alexandre.torgue@foss.st.com>, <joabreu@synopsys.com>,
	<davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
	<pabeni@redhat.com>, <mcoquelin.stm32@gmail.com>,
	<netdev@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] net: stmmac: xgmac: fix initializer element is not constant error
Date: Thu, 15 Feb 2024 09:31:23 -0800	[thread overview]
Message-ID: <ff53b219-201d-4544-ab37-014286c299ae@intel.com> (raw)
In-Reply-To: <867da21e-7f30-4caf-9f78-260d426e4186@posteo.net>

On 2/14/2024 2:07 PM, Mark O'Donovan wrote:
> 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@posteo.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@intel.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

Thanks for pointing this out, I failed to find it with grep. Useful to
have this as a reference.

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