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Message-ID: <3e15fbcc6cc87f4bafea8bc0a7164366cb1f4439.camel@redhat.com>
Subject: Re: [PATCH] net: stmmac: xgmac: fix initializer element is not
 constant error
From: Paolo Abeni <pabeni@redhat.com>
To: Mark O'Donovan <shiftee@posteo.net>, Jacob Keller
 <jacob.e.keller@intel.com>,  linux-kernel@vger.kernel.org
Cc: alexandre.torgue@foss.st.com, joabreu@synopsys.com, davem@davemloft.net,
  edumazet@google.com, kuba@kernel.org, mcoquelin.stm32@gmail.com, 
 netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, 
 linux-arm-kernel@lists.infradead.org
Date: Thu, 15 Feb 2024 11:47:20 +0100
In-Reply-To: <867da21e-7f30-4caf-9f78-260d426e4186@posteo.net>
References: <20240212154319.907447-1-shiftee@posteo.net>
	 <44c29a45-86fa-4e41-b4b5-e69187f0712e@intel.com>
	 <867da21e-7f30-4caf-9f78-260d426e4186@posteo.net>
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Hi,

On Wed, 2024-02-14 at 22:07 +0000, Mark O'Donovan wrote:
> On 14/02/2024 20:31, Jacob Keller wrote:
> >=20
> >=20
> > 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.
> > >=20
> > > More info here:
> > > https://lore.kernel.org/all/20240103-fix-bq24190_charger-vbus_desc-no=
n-const-v1-1-115ddf798c70@kernel.org
> > >=20
> > > Signed-off-by: Mark O'Donovan <shiftee@posteo.net>
> > > ---
> >=20
> > I'm not sure whether the Linux kernel project has an explicit cutoff fo=
r
> > what versions of GCC (or other compilers) are supported. GCC 8 was firs=
t
> > released in 2018.
> >=20
> > 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 comp=
iler.
> >=20
> > Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
> >=20
> > >   drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c | 4 ++--
> > >   1 file changed, 2 insertions(+), 2 deletions(-)
> > >=20
> > > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c b/dr=
ivers/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]=3D {
> > >   	{ false, "UNKNOWN", "Unknown Error" }, /* 31 */
> > >   };
> > >  =20
> > > -static const char * const dpp_rx_err =3D "Read Rx Descriptor Parity =
checker Error";
> > > -static const char * const dpp_tx_err =3D "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]=
 =3D {
> > >   	{ true, "TDPES0", dpp_tx_err },
> > >   	{ true, "TDPES1", dpp_tx_err },
> > >=20
> > > base-commit: 841c35169323cd833294798e58b9bf63fa4fa1de
>=20
> Thanks Jacob.
>=20
> The minimum versions for compilers and other tools are documented here:
> https://www.kernel.org/doc/html/latest/process/changes.html
>=20
> 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