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

[Paolo Abeni <pabeni@redhat.com>]

Hi,

On Wed, 2024-02-14 at 22:07 +0000, 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.

Note that we already have net commit
1692b9775e745f84b69dc8ad0075b0855a43db4e addressing this issue.

Thanks,

Paolo