Re: [PATCH 04/11] powerpc/xive: Introduce xive_core_debugfs_create()

[Michael Ellerman <mpe@ellerman.id.au>]

Cédric Le Goater <clg@kaod.org> writes:

> and fix some compile issues when !CONFIG_DEBUG_FS.
>
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
>  arch/powerpc/sysdev/xive/common.c | 17 ++++++++++++++---
>  1 file changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c
> index 3d558cad1f19..b71cc1020296 100644
> --- a/arch/powerpc/sysdev/xive/common.c
> +++ b/arch/powerpc/sysdev/xive/common.c
...
> @@ -1779,10 +1782,18 @@ static int xive_core_debug_show(struct seq_file *m, void *private)
>  }
>  DEFINE_SHOW_ATTRIBUTE(xive_core_debug);
>  
> +static void xive_core_debugfs_create(void)
> +{
> +	debugfs_create_file("xive", 0400, arch_debugfs_dir,
> +			    NULL, &xive_core_debug_fops);
> +}
> +
> +#endif /* CONFIG_DEBUG_FS */
> +
>  int xive_core_debug_init(void)
>  {
> -	if (xive_enabled())
> -		debugfs_create_file("xive", 0400, arch_debugfs_dir,
> -				    NULL, &xive_core_debug_fops);
> +	if (xive_enabled() && IS_ENABLED(CONFIG_DEBUG_FS))
> +		xive_core_debugfs_create();
> +
>  	return 0;
>  }

For skiroot_defconfig this gives me:

  arch/powerpc/sysdev/xive/common.c: In function ‘xive_core_init’:
  arch/powerpc/sysdev/xive/common.c:1676:2: error: implicit declaration of function ‘xive_core_debugfs_create’; did you mean ‘xive_core_debug_init’? [-Werror=implicit-function-declaration]
   1676 |  xive_core_debugfs_create();
        |  ^~~~~~~~~~~~~~~~~~~~~~~~
        |  xive_core_debug_init
  cc1: all warnings being treated as errors


We need an empty inline stub of xive_core_debugfs_create() for the
CONFIG_DEBUG_FS=n case.

I'm wondering though why do we have xive_core_debug_init() at all, why
don't we just initialise the debugfs files in xive_core_init()?

cheers