From: Arnd Bergmann <[email protected]>
Date: Wed, 4 Apr 2018 12:38:40 +0200
> The new of_get_nvmem_mac_address() helper function causes a link error
> with CONFIG_NVMEM=m:
>
> drivers/of/of_net.o: In function `of_get_nvmem_mac_address':
> of_net.c:(.text+0x168): undefined reference to `of_nvmem_cell_get'
> of_net.c:(.text+0x19c): undefined reference to `nvmem_cell_read'
> of_net.c:(.text+0x1a8): undefined reference to `nvmem_cell_put'
>
> I could not come up with a good solution for this, as the code is always
> built-in. Using an #if IS_REACHABLE() check around it would solve the
> link time issue but then stop it from working in that configuration.
> Making of_nvmem_cell_get() an inline function could also solve that, but
> seems a bit ugly since it's somewhat larger than most inline functions,
> and it would just bring that problem into the callers. Splitting the
> function into a separate file might be an alternative.
>
> This uses the big hammer by making CONFIG_NVMEM itself a 'bool' symbol,
> which avoids the problem entirely but makes the vmlinux larger for anyone
> that might use NVMEM support but doesn't need it built-in otherwise.
>
> Fixes: 9217e566bdee ("of_net: Implement of_get_nvmem_mac_address helper")
> Cc: Mike Looijmans <[email protected]>
> Cc: Florian Fainelli <[email protected]>
> Cc: Andrew Lunn <[email protected]>
> Cc: David S. Miller <[email protected]>
> Cc: [email protected]
> Signed-off-by: Arnd Bergmann <[email protected]>
> ---
> The problem arrived through the networking tree, but it's now in
> mainline, so the fix could go through either tree
Ok, applied, thanks Arnd.
