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net: stmmac: xgmac: use #define for string constants
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commit 1692b97 upstream.

The cited commit introduces and uses the string constants dpp_tx_err and
dpp_rx_err. These are assigned to constant fields of the array
dwxgmac3_error_desc.

It has been reported that on GCC 6 and 7.5.0 this results in warnings
such as:

  .../dwxgmac2_core.c:836:20: error: initialiser element is not constant
   { true, "TDPES0", dpp_tx_err },

I have been able to reproduce this using: GCC 7.5.0, 8.4.0, 9.4.0 and 10.5.0.
But not GCC 13.2.0.

So it seems this effects older compilers but not newer ones.
As Jon points out in his report, the minimum compiler supported by
the kernel is GCC 5.1, so it does seem that this ought to be fixed.

It is not clear to me what combination of 'const', if any, would address
this problem.  So this patch takes of using #defines for the string
constants

Compile tested only.

Fixes: 46eba19 ("net: stmmac: xgmac: fix handling of DPP safety error for DMA channels")
Reported-by: Jon Hunter <jonathanh@nvidia.com>
Closes: https://lore.kernel.org/netdev/c25eb595-8d91-40ea-9f52-efa15ebafdbc@nvidia.com/
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202402081135.lAxxBXHk-lkp@intel.com/
Signed-off-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240208-xgmac-const-v1-1-e69a1eeabfc8@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@horms @gregkh
horms authored and gregkh committed Feb 16, 2024
1 parent 50d0dff commit 9b16230
Showing 1 changed file with 35 additions and 34 deletions.
69 changes: 35 additions & 34 deletions drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -830,41 +830,42 @@ 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 },
{ true, "TDPES2", dpp_tx_err },
{ true, "TDPES3", dpp_tx_err },
{ true, "TDPES4", dpp_tx_err },
{ true, "TDPES5", dpp_tx_err },
{ true, "TDPES6", dpp_tx_err },
{ true, "TDPES7", dpp_tx_err },
{ true, "TDPES8", dpp_tx_err },
{ true, "TDPES9", dpp_tx_err },
{ true, "TDPES10", dpp_tx_err },
{ true, "TDPES11", dpp_tx_err },
{ true, "TDPES12", dpp_tx_err },
{ true, "TDPES13", dpp_tx_err },
{ true, "TDPES14", dpp_tx_err },
{ true, "TDPES15", dpp_tx_err },
{ true, "RDPES0", dpp_rx_err },
{ true, "RDPES1", dpp_rx_err },
{ true, "RDPES2", dpp_rx_err },
{ true, "RDPES3", dpp_rx_err },
{ true, "RDPES4", dpp_rx_err },
{ true, "RDPES5", dpp_rx_err },
{ true, "RDPES6", dpp_rx_err },
{ true, "RDPES7", dpp_rx_err },
{ true, "RDPES8", dpp_rx_err },
{ true, "RDPES9", dpp_rx_err },
{ true, "RDPES10", dpp_rx_err },
{ true, "RDPES11", dpp_rx_err },
{ true, "RDPES12", dpp_rx_err },
{ true, "RDPES13", dpp_rx_err },
{ true, "RDPES14", dpp_rx_err },
{ true, "RDPES15", dpp_rx_err },
{ true, "TDPES0", DPP_TX_ERR },
{ true, "TDPES1", DPP_TX_ERR },
{ true, "TDPES2", DPP_TX_ERR },
{ true, "TDPES3", DPP_TX_ERR },
{ true, "TDPES4", DPP_TX_ERR },
{ true, "TDPES5", DPP_TX_ERR },
{ true, "TDPES6", DPP_TX_ERR },
{ true, "TDPES7", DPP_TX_ERR },
{ true, "TDPES8", DPP_TX_ERR },
{ true, "TDPES9", DPP_TX_ERR },
{ true, "TDPES10", DPP_TX_ERR },
{ true, "TDPES11", DPP_TX_ERR },
{ true, "TDPES12", DPP_TX_ERR },
{ true, "TDPES13", DPP_TX_ERR },
{ true, "TDPES14", DPP_TX_ERR },
{ true, "TDPES15", DPP_TX_ERR },
{ true, "RDPES0", DPP_RX_ERR },
{ true, "RDPES1", DPP_RX_ERR },
{ true, "RDPES2", DPP_RX_ERR },
{ true, "RDPES3", DPP_RX_ERR },
{ true, "RDPES4", DPP_RX_ERR },
{ true, "RDPES5", DPP_RX_ERR },
{ true, "RDPES6", DPP_RX_ERR },
{ true, "RDPES7", DPP_RX_ERR },
{ true, "RDPES8", DPP_RX_ERR },
{ true, "RDPES9", DPP_RX_ERR },
{ true, "RDPES10", DPP_RX_ERR },
{ true, "RDPES11", DPP_RX_ERR },
{ true, "RDPES12", DPP_RX_ERR },
{ true, "RDPES13", DPP_RX_ERR },
{ true, "RDPES14", DPP_RX_ERR },
{ true, "RDPES15", DPP_RX_ERR },
};

static void dwxgmac3_handle_dma_err(struct net_device *ndev,
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