From: Arnd Bergmann <[email protected]>
Clang points out a syntax error, as the etr_catu_buf_ops structure is
declared 'static' before the type is known:
In file included from drivers/hwtracing/coresight/coresight-tmc-etr.c:12:
drivers/hwtracing/coresight/coresight-catu.h:116:40: warning: tentative
definition of variable with internal linkage has incomplete non-array type
'const struct etr_buf_operations' [-Wtentative-definition-incomplete-type]
static const struct etr_buf_operations etr_catu_buf_ops;
^
drivers/hwtracing/coresight/coresight-catu.h:116:21: note: forward declaration
of 'struct etr_buf_operations'
static const struct etr_buf_operations etr_catu_buf_ops;
This seems worth fixing in the code, so replace pointer to the empty
constant structure with a NULL pointer. We need an extra NULL pointer
check here, but the result should be better object code otherwise,
avoiding the silly empty structure.
Fixes: 434d611cddef ("coresight: catu: Plug in CATU as a backend for ETR
buffer")
Signed-off-by: Arnd Bergmann <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
[Fixed line over 80 characters]
Signed-off-by: Mathieu Poirier <[email protected]>
---
drivers/hwtracing/coresight/coresight-catu.h | 5 -----
drivers/hwtracing/coresight/coresight-tmc-etr.c | 5 +++--
2 files changed, 3 insertions(+), 7 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-catu.h
b/drivers/hwtracing/coresight/coresight-catu.h
index 1b281f0dcccc..1d2ad183fd92 100644
--- a/drivers/hwtracing/coresight/coresight-catu.h
+++ b/drivers/hwtracing/coresight/coresight-catu.h
@@ -109,11 +109,6 @@ static inline bool coresight_is_catu_device(struct
coresight_device *csdev)
return true;
}
-#ifdef CONFIG_CORESIGHT_CATU
extern const struct etr_buf_operations etr_catu_buf_ops;
-#else
-/* Dummy declaration for the CATU ops */
-static const struct etr_buf_operations etr_catu_buf_ops;
-#endif
#endif
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c
b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index f684283890d3..cf7a32ce209d 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -772,7 +772,8 @@ static inline void tmc_etr_disable_catu(struct tmc_drvdata
*drvdata)
static const struct etr_buf_operations *etr_buf_ops[] = {
[ETR_MODE_FLAT] = &etr_flat_buf_ops,
[ETR_MODE_ETR_SG] = &etr_sg_buf_ops,
- [ETR_MODE_CATU] = &etr_catu_buf_ops,
+ [ETR_MODE_CATU] = IS_ENABLED(CONFIG_CORESIGHT_CATU)
+ ? &etr_catu_buf_ops : NULL,
};
static inline int tmc_etr_mode_alloc_buf(int mode,
@@ -786,7 +787,7 @@ static inline int tmc_etr_mode_alloc_buf(int mode,
case ETR_MODE_FLAT:
case ETR_MODE_ETR_SG:
case ETR_MODE_CATU:
- if (etr_buf_ops[mode]->alloc)
+ if (etr_buf_ops[mode] && etr_buf_ops[mode]->alloc)
rc = etr_buf_ops[mode]->alloc(drvdata, etr_buf,
node, pages);
if (!rc)
--
2.17.1
