netdev - Re: [PATCH iwl-net] ice: health.c: fix compilation on gcc 7.5

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Message-ID: <20250205204546.GM554665@kernel.org>
Date: Wed, 5 Feb 2025 20:45:46 +0000
From: Simon Horman <horms@...nel.org>
To: Przemek Kitszel <przemyslaw.kitszel@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org,
	Tony Nguyen <anthony.l.nguyen@...el.com>, netdev@...r.kernel.org,
	Konrad Knitter <konrad.knitter@...el.com>,
	Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
	Qiuxu Zhuo <qiuxu.zhuo@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kees Cook <kees@...nel.org>,
	Nick Desaulniers <nick.desaulniers@...il.com>,
	Jiri Slaby <jirislaby@...nel.org>
Subject: Re: [PATCH iwl-net] ice: health.c: fix compilation on gcc 7.5

+ Jiri

On Wed, Feb 05, 2025 at 11:42:12AM +0100, Przemek Kitszel wrote:
> GCC 7 is not as good as GCC 8+ in telling what is a compile-time const,
> and thus could be used for static storage. So we could not use variables
> for that, no matter how much "const" keyword is sprinkled around.
> 
> Excerpt from the report:
> My GCC is: gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0.
> 
>   CC [M]  drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.o
> drivers/net/ethernet/intel/ice/devlink/health.c:35:3: error: initializer element is not constant
>    ice_common_port_solutions, {ice_port_number_label}},
>    ^~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/ethernet/intel/ice/devlink/health.c:35:3: note: (near initialization for 'ice_health_status_lookup[0].solution')
> drivers/net/ethernet/intel/ice/devlink/health.c:35:31: error: initializer element is not constant
>    ice_common_port_solutions, {ice_port_number_label}},
>                                ^~~~~~~~~~~~~~~~~~~~~
> drivers/net/ethernet/intel/ice/devlink/health.c:35:31: note: (near initialization for 'ice_health_status_lookup[0].data_label[0]')
> drivers/net/ethernet/intel/ice/devlink/health.c:37:46: error: initializer element is not constant
>    "Change or replace the module or cable.", {ice_port_number_label}},
>                                               ^~~~~~~~~~~~~~~~~~~~~
> drivers/net/ethernet/intel/ice/devlink/health.c:37:46: note: (near initialization for 'ice_health_status_lookup[1].data_label[0]')
> drivers/net/ethernet/intel/ice/devlink/health.c:39:3: error: initializer element is not constant
>    ice_common_port_solutions, {ice_port_number_label}},
>    ^~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Fixes: 85d6164ec56d ("ice: add fw and port health reporters")
> Reported-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
> Closes: https://lore.kernel.org/netdev/CY8PR11MB7134BF7A46D71E50D25FA7A989F72@CY8PR11MB7134.namprd11.prod.outlook.com
> Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> ---
> I would really like to bump min gcc to 8.5 (RH 8 family),
> instead of supporting old Ubuntu. However SLES 15 is also stuck with gcc 7.5 :(
> 
> CC: Linus Torvalds <torvalds@...ux-foundation.org>
> CC: Kees Cook <kees@...nel.org>
> CC: Nick Desaulniers <nick.desaulniers@...il.com>

Hi Prezemek,

I ran into a similar problem not so long ago and I'm wondering if
the following, based on a suggestion by Jiri Slaby, resolves your
problem.

diff --git a/drivers/net/ethernet/intel/ice/devlink/health.c b/drivers/net/ethernet/intel/ice/devlink/health.c
index ea40f7941259..19c3d37aa768 100644
--- a/drivers/net/ethernet/intel/ice/devlink/health.c
+++ b/drivers/net/ethernet/intel/ice/devlink/health.c
@@ -25,10 +25,10 @@ struct ice_health_status {
  * The below lookup requires to be sorted by code.
  */
 
-static const char *const ice_common_port_solutions =
+static const char ice_common_port_solutions[] =
 	"Check your cable connection. Change or replace the module or cable. Manually set speed and duplex.";
-static const char *const ice_port_number_label = "Port Number";
-static const char *const ice_update_nvm_solution = "Update to the latest NVM image.";
+static const char ice_port_number_label[] = "Port Number";
+static const char ice_update_nvm_solution[] = "Update to the latest NVM image.";
 
 static const struct ice_health_status ice_health_status_lookup[] = {
 	{ICE_AQC_HEALTH_STATUS_ERR_UNKNOWN_MOD_STRICT, "An unsupported module was detected.",


Link: https://lore.kernel.org/netdev/485dbc5a-a04b-40c2-9481-955eaa5ce2e2@kernel.org/
Link: https://git.kernel.org/netdev/net-next/c/36fb51479e3c