| Message ID | 20190307103309.1574563-1-arnd@arndb.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | coresight: catu: fix clang build warning | expand |
Hi Arnd, On 07/03/2019 10:32, Arnd Bergmann wrote: > 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 <arnd@arndb.de> Thanks for the fix. Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
On Thu, 7 Mar 2019 at 03:48, Suzuki K Poulose <suzuki.poulose@arm.com> wrote: > > Hi Arnd, > > On 07/03/2019 10:32, Arnd Bergmann wrote: > > 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 <arnd@arndb.de> > > Thanks for the fix. > > Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Applied after fixing line over 80 characters. Thanks, Mathieu
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..6378c3dece6b 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -772,7 +772,7 @@ 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 +786,7 @@ 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)
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 <arnd@arndb.de> --- drivers/hwtracing/coresight/coresight-catu.h | 5 ----- drivers/hwtracing/coresight/coresight-tmc-etr.c | 4 ++-- 2 files changed, 2 insertions(+), 7 deletions(-)