Hi Arnd,

On 26/01/2023 16:35, Arnd Bergmann wrote:

From: Arnd Bergmann arnd@arndb.de

'remove' callbacks get called whenever a device is unbound from the driver, which can get triggered from user space.

Putting it into the __exit section means that the function gets dropped in for built-in drivers, as pointed out by this build warning:

`tpda_remove' referenced in section `.data' of drivers/hwtracing/coresight/coresight-tpda.o: defined in discarded section `.exit.text' of drivers/hwtracing/coresight/coresight-tpda.o `tpdm_remove' referenced in section `.data' of drivers/hwtracing/coresight/coresight-tpdm.o: defined in discarded section `.exit.text' of drivers/hwtracing/coresight/coresight-tpdm.o

Thanks for the fix, I will queue this. Btw, I did try to reproduce it locally, but couldn't trigger the warnings, even with

CONFIG_WERROR=y

and all CORESIGHT configs builtin. I see other drivers doing the same outside coresight too. Just curious to know why is this any different. Is it specific to "bus" driver (e.g. AMBA) ?

Suzuki

Fixes: 5b7916625c01 ("Coresight: Add TPDA link driver") Fixes: b3c71626a933 ("Coresight: Add coresight TPDM source driver") Signed-off-by: Arnd Bergmann arnd@arndb.de

---

drivers/hwtracing/coresight/coresight-tpda.c | 2 +- drivers/hwtracing/coresight/coresight-tpdm.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c index 19c25c9f6157..382d648529e7 100644 --- a/drivers/hwtracing/coresight/coresight-tpda.c +++ b/drivers/hwtracing/coresight/coresight-tpda.c @@ -174,7 +174,7 @@ static int tpda_probe(struct amba_device *adev, const struct amba_id *id) return 0; } -static void __exit tpda_remove(struct amba_device *adev) +static void tpda_remove(struct amba_device *adev) { struct tpda_drvdata *drvdata = dev_get_drvdata(&adev->dev); diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c index 349a82bb3270..9479a5e8c672 100644 --- a/drivers/hwtracing/coresight/coresight-tpdm.c +++ b/drivers/hwtracing/coresight/coresight-tpdm.c @@ -223,7 +223,7 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id) return 0; } -static void __exit tpdm_remove(struct amba_device *adev) +static void tpdm_remove(struct amba_device *adev) { struct tpdm_drvdata *drvdata = dev_get_drvdata(&adev->dev);