[PATCH v2 3/7] acpi/cppc: Modify show_cppc_data macro

["Natarajan, Janakarajan" <Janakarajan.Natarajan@amd.com>]

From: Yazen Ghannam <Yazen.Ghannam@amd.com>

The show_cppc_data macro implicity uses define_one_cppc_ro. This will
prevent the creation of an attribute with read and write permissions.

Create a separate macro that defines a show attribute and creates
a read-only sysfs entry. This is in preparation for adding a macro
to create sysfs entries with read+write permission.

Signed-off-by: Yazen Ghannam <Yazen.Ghannam@amd.com>
[ carved out into a patch, cleaned up, productized ]
Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>
---
 drivers/acpi/cppc_acpi.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 37157d19d2df..10ae5a5818e6 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -159,17 +159,20 @@ __ATTR(_name, 0444, show_##_name, NULL)
 		return scnprintf(buf, PAGE_SIZE, "%llu\n",		\
 				(u64)st_name.member_name);		\
 	}								\
+
+#define show_cppc_data_ro(access_fn, struct_name, member_name)		\
+	show_cppc_data(access_fn, struct_name, member_name)		\
 	define_one_cppc_ro(member_name)
 
-show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, highest_perf);
-show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, lowest_perf);
-show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, nominal_perf);
-show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, lowest_nonlinear_perf);
-show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, lowest_freq);
-show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, nominal_freq);
+show_cppc_data_ro(cppc_get_perf_caps, cppc_perf_caps, highest_perf);
+show_cppc_data_ro(cppc_get_perf_caps, cppc_perf_caps, lowest_perf);
+show_cppc_data_ro(cppc_get_perf_caps, cppc_perf_caps, nominal_perf);
+show_cppc_data_ro(cppc_get_perf_caps, cppc_perf_caps, lowest_nonlinear_perf);
+show_cppc_data_ro(cppc_get_perf_caps, cppc_perf_caps, lowest_freq);
+show_cppc_data_ro(cppc_get_perf_caps, cppc_perf_caps, nominal_freq);
 
-show_cppc_data(cppc_get_perf_ctrs, cppc_perf_fb_ctrs, reference_perf);
-show_cppc_data(cppc_get_perf_ctrs, cppc_perf_fb_ctrs, wraparound_time);
+show_cppc_data_ro(cppc_get_perf_ctrs, cppc_perf_fb_ctrs, reference_perf);
+show_cppc_data_ro(cppc_get_perf_ctrs, cppc_perf_fb_ctrs, wraparound_time);
 
 static ssize_t show_feedback_ctrs(struct kobject *kobj,
 		struct attribute *attr, char *buf)
-- 
2.17.1