Re: [linux-next:master 2051/2153] alpha-linux-ld: drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.o:undefined reference to `stmmac_simple_pm_ops'

["Russell King (Oracle)" <linux@armlinux.org.uk>]

Hi Rafael,

It seems that in the config below, CONFIG_PM is not set, which leads
EXPORT_SIMPLE_DEV_PM_OPS() not to export the ops, and define it static.

However, if I instead do:

DEFINE_SIMPLE_DEV_PM_OPS(name, ...);
EXPORT_SYMBOL_GPL(name);

then the symbol will obviously still be exported, and it also won't be
static, but the struct will be empty.

Essentially, EXPORT_SIMPLE_DEV_PM_OPS() is not semantically the same as
DEFINE_SIMPLE_DEV_PM_OPS() + EXPORT_SYMBOL_GPL() which is not what I
expected.

First question is, is this expected behaviour?

Second, should I be using DEFINE_SIMPLE_DEV_PM_OPS() +
EXPORT_SYMBOL_GPL() instead for this case? If not, should I use
pm_ptr() in all the drivers that reference the
EXPORT_SIMPLE_DEV_PM_OPS() symbol?

Thanks.

On Wed, Aug 13, 2025 at 08:19:37PM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   43c3c17f0c805882d1b48818b1085747a68c80ec
> commit: 38772638d6d1989655f5a05b273dc62a026e0ef1 [2051/2153] net: stmmac: loongson: convert to suspend()/resume() methods
> config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20250813/202508132051.a7hJXkrd-lkp@intel.com/config)
> compiler: alpha-linux-gcc (GCC) 15.1.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250813/202508132051.a7hJXkrd-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202508132051.a7hJXkrd-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>    `xe_configfs_exit' referenced in section `.data.rel.ro' of drivers/gpu/drm/xe/xe_module.o: defined in discarded section `.exit.text' of drivers/gpu/drm/xe/xe_configfs.o
> >> alpha-linux-ld: drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.o:(.data.rel+0xe0): undefined reference to `stmmac_simple_pm_ops'
> 
> -- 
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
> 

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