Hi Julia,
On Thursday, March 29, 2018 9:12:06 PM CEST Julia Lawall wrote:
> Use DEFINE_DEBUGFS_ATTRIBUTE rather than DEFINE_SIMPLE_ATTRIBUTE
> for debugfs files.
>
> Semantic patch information:
> Rationale: DEFINE_SIMPLE_ATTRIBUTE + debugfs_create_file()
> imposes some significant overhead as compared to
> DEFINE_DEBUGFS_ATTRIBUTE + debugfs_create_file_unsafe().
>
> Generated by: scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci
We've dropped the debugfs bits from intel_pstate entirely, so this change
is not applicable any more.
Thanks!
> Fixes: 9eec7989e762 ("OPTIONAL: cpufreq/intel_pstate: Expose LP controller
> parameters via debugfs.")
> CC: Francisco Jerez <curroje...@riseup.net>
> Signed-off-by: Fengguang Wu <fengguang...@intel.com>
> Signed-off-by: Julia Lawall <julia.law...@lip6.fr>
> ---
>
> I don't actually know anything about this issue. The change was suggested
> by kbuild.
>
> intel_pstate.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -885,7 +885,7 @@ static int lp_param_get(void *data, u64
> *val = *(u32 *)data;
> return 0;
> }
> -DEFINE_SIMPLE_ATTRIBUTE(fops_lp_param, lp_param_get, lp_param_set, "%llu\n");
> +DEFINE_DEBUGFS_ATTRIBUTE(fops_lp_param, lp_param_get, lp_param_set,
> "%llu\n");
>
> static struct dentry *debugfs_parent;
>
> @@ -922,9 +922,10 @@ static void intel_pstate_debug_expose_pa
> for (i = 0; lp_files[i].name; i++) {
> struct dentry *dentry;
>
> - dentry = debugfs_create_file(lp_files[i].name, 0660,
> - debugfs_parent, lp_files[i].value,
> - &fops_lp_param);
> + dentry = debugfs_create_file_unsafe(lp_files[i].name, 0660,
> + debugfs_parent,
> + lp_files[i].value,
> + &fops_lp_param);
> if (!IS_ERR(dentry))
> lp_files[i].dentry = dentry;
> }
>
