On 28/05/18 16:41, Arnd Bergmann wrote:
When the arm-cci driver is enabled, but both CONFIG_ARM_CCI5xx_PMU and
CONFIG_ARM_CCI400_PMU are not, we get a warning about how parts of
the driver are never used:
drivers/perf/arm-cci.c:1454:29: error: 'cci_pmu_models' defined but not used
[-Werror=unused-variable]
drivers/perf/arm-cci.c:693:16: error: 'cci_pmu_event_show' defined but not used
[-Werror=unused-function]
drivers/perf/arm-cci.c:685:16: error: 'cci_pmu_format_show' defined but not
used [-Werror=unused-function]
Marking all three functions as __maybe_unused avoids the warnings in
randconfig builds. I'm doing this lacking any ideas for a better fix.
Yeah, it's a bit of a silly configuration to allow building a driver
supporting no PMU types, but I couldn't find a way to enforce "at least
one sub-option enabled" logic without introducing mutually-exclusive
dependencies which kbuild thinks are recursive.
An alternative would be to remove the CCI400/CCI5x0 configurability
altogether - I've not not looked in detail at how much difference that
actually makes.
Otherwise, as an immediate quick-fix:
Reviewed-by: Robin Murphy <[email protected]>
Thanks,
Robin.
Fixes: 3de6be7a3dd8 ("drivers/bus: Split Arm CCI driver")
Signed-off-by: Arnd Bergmann <[email protected]>
---
drivers/perf/arm-cci.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/perf/arm-cci.c b/drivers/perf/arm-cci.c
index e6fadc8e1178..0d09d8e669cd 100644
--- a/drivers/perf/arm-cci.c
+++ b/drivers/perf/arm-cci.c
@@ -120,9 +120,9 @@ enum cci_models {
static void pmu_write_counters(struct cci_pmu *cci_pmu,
unsigned long *mask);
-static ssize_t cci_pmu_format_show(struct device *dev,
+static ssize_t __maybe_unused cci_pmu_format_show(struct device *dev,
struct device_attribute *attr, char *buf);
-static ssize_t cci_pmu_event_show(struct device *dev,
+static ssize_t __maybe_unused cci_pmu_event_show(struct device *dev,
struct device_attribute *attr, char *buf);
#define CCI_EXT_ATTR_ENTRY(_name, _func, _config) \
@@ -1451,7 +1451,7 @@ static int cci_pmu_offline_cpu(unsigned int cpu)
return 0;
}
-static struct cci_pmu_model cci_pmu_models[] = {
+static __maybe_unused struct cci_pmu_model cci_pmu_models[] = {
#ifdef CONFIG_ARM_CCI400_PMU
[CCI400_R0] = {
.name = "CCI_400",
