Successfully identified regression in *linux* in CI configuration tcwg_kernel/llvm-release-aarch64-next-allmodconfig. So far, this commit has regressed CI configurations: - tcwg_kernel/llvm-release-aarch64-next-allmodconfig

Culprit: <cut> commit 3d463dd5023b5a58b3c37207d65eeb5acbac2be3 Author: Krzysztof Kozlowski krzysztof.kozlowski@canonical.com Date: Thu Jul 29 12:40:19 2021 +0200

nfc: fdp: constify several pointers

Several functions do not modify pointed data so arguments and local variables can be const for correctness and safety. This allows also making file-scope nci_core_get_config_otp_ram_version array const.

Signed-off-by: Krzysztof Kozlowski krzysztof.kozlowski@canonical.com Signed-off-by: David S. Miller davem@davemloft.net </cut>

Results regressed to (for first_bad == 3d463dd5023b5a58b3c37207d65eeb5acbac2be3) # reset_artifacts: -10 # build_abe binutils: -9 # build_llvm: -5 # build_abe qemu: -2 # linux_n_obj: 21802 # First few build errors in logs: # 00:03:45 drivers/nfc/fdp/fdp.c:116:60: error: passing 'const char *' to parameter of type '__u8 *' (aka 'unsigned char *') discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers] # 00:03:45 make[3]: *** [drivers/nfc/fdp/fdp.o] Error 1 # 00:03:49 make[2]: *** [drivers/nfc/fdp] Error 2 # 00:04:01 make[1]: *** [drivers/nfc] Error 2 # 00:09:25 make: *** [drivers] Error 2

from (for last_good == c3e26b6dc1b4e3e8f57be4f004b1f2a410c5c468) # reset_artifacts: -10 # build_abe binutils: -9 # build_llvm: -5 # build_abe qemu: -2 # linux_n_obj: 29857 # linux build successful: all # linux boot successful: boot

Artifacts of last_good build: https://ci.linaro.org/job/tcwg_kernel-llvm-bisect-llvm-release-aarch64-next-... Artifacts of first_bad build: https://ci.linaro.org/job/tcwg_kernel-llvm-bisect-llvm-release-aarch64-next-... Build top page/logs: https://ci.linaro.org/job/tcwg_kernel-llvm-bisect-llvm-release-aarch64-next-...

Configuration details: rr[linux_git]="https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git#cb163627..."

Reproduce builds: <cut> mkdir investigate-linux-3d463dd5023b5a58b3c37207d65eeb5acbac2be3 cd investigate-linux-3d463dd5023b5a58b3c37207d65eeb5acbac2be3

git clone https://git.linaro.org/toolchain/jenkins-scripts

mkdir -p artifacts/manifests curl -o artifacts/manifests/build-baseline.sh https://ci.linaro.org/job/tcwg_kernel-llvm-bisect-llvm-release-aarch64-next-... --fail curl -o artifacts/manifests/build-parameters.sh https://ci.linaro.org/job/tcwg_kernel-llvm-bisect-llvm-release-aarch64-next-... --fail curl -o artifacts/test.sh https://ci.linaro.org/job/tcwg_kernel-llvm-bisect-llvm-release-aarch64-next-... --fail chmod +x artifacts/test.sh

# Reproduce the baseline build (build all pre-requisites) ./jenkins-scripts/tcwg_kernel-build.sh @@ artifacts/manifests/build-baseline.sh

# Save baseline build state (which is then restored in artifacts/test.sh) mkdir -p ./bisect rsync -a --del --delete-excluded --exclude /bisect/ --exclude /artifacts/ --exclude /linux/ ./ ./bisect/baseline/

cd linux

# Reproduce first_bad build git checkout --detach 3d463dd5023b5a58b3c37207d65eeb5acbac2be3 ../artifacts/test.sh

# Reproduce last_good build git checkout --detach c3e26b6dc1b4e3e8f57be4f004b1f2a410c5c468 ../artifacts/test.sh

cd .. </cut>

History of pending regressions and results: https://git.linaro.org/toolchain/ci/base-artifacts.git/log/?h=linaro-local/c...

Artifacts: https://ci.linaro.org/job/tcwg_kernel-llvm-bisect-llvm-release-aarch64-next-... Build log: https://ci.linaro.org/job/tcwg_kernel-llvm-bisect-llvm-release-aarch64-next-...

Full commit (up to 1000 lines): <cut> commit 3d463dd5023b5a58b3c37207d65eeb5acbac2be3 Author: Krzysztof Kozlowski krzysztof.kozlowski@canonical.com Date: Thu Jul 29 12:40:19 2021 +0200

nfc: fdp: constify several pointers

Several functions do not modify pointed data so arguments and local variables can be const for correctness and safety. This allows also making file-scope nci_core_get_config_otp_ram_version array const.

Signed-off-by: Krzysztof Kozlowski krzysztof.kozlowski@canonical.com Signed-off-by: David S. Miller davem@davemloft.net --- drivers/nfc/fdp/fdp.c | 18 +++++++++--------- drivers/nfc/fdp/fdp.h | 2 +- drivers/nfc/fdp/i2c.c | 6 +++--- 3 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/nfc/fdp/fdp.c b/drivers/nfc/fdp/fdp.c index 3f5fba922c4d..c6b3334f24c9 100644 --- a/drivers/nfc/fdp/fdp.c +++ b/drivers/nfc/fdp/fdp.c @@ -52,7 +52,7 @@ struct fdp_nci_info { u32 limited_otp_version; u8 key_index;

- u8 *fw_vsc_cfg; + const u8 *fw_vsc_cfg; u8 clock_type; u32 clock_freq;

@@ -65,7 +65,7 @@ struct fdp_nci_info { wait_queue_head_t setup_wq; };

-static u8 nci_core_get_config_otp_ram_version[5] = { +static const u8 nci_core_get_config_otp_ram_version[5] = { 0x04, NCI_PARAM_ID_FW_RAM_VERSION, NCI_PARAM_ID_FW_OTP_VERSION, @@ -111,7 +111,7 @@ static inline int fdp_nci_patch_cmd(struct nci_dev *ndev, u8 type) }

static inline int fdp_nci_set_production_data(struct nci_dev *ndev, u8 len, - char *data) + const char *data) { return nci_prop_cmd(ndev, NCI_OP_PROP_SET_PDATA_OID, len, data); } @@ -236,7 +236,7 @@ static int fdp_nci_send_patch(struct nci_dev *ndev, u8 conn_id, u8 type)

static int fdp_nci_open(struct nci_dev *ndev) { - struct fdp_nci_info *info = nci_get_drvdata(ndev); + const struct fdp_nci_info *info = nci_get_drvdata(ndev);

return info->phy_ops->enable(info->phy); } @@ -260,7 +260,7 @@ static int fdp_nci_request_firmware(struct nci_dev *ndev) { struct fdp_nci_info *info = nci_get_drvdata(ndev); struct device *dev = &info->phy->i2c_dev->dev; - u8 *data; + const u8 *data; int r;

r = request_firmware(&info->ram_patch, FDP_RAM_PATCH_NAME, dev); @@ -269,7 +269,7 @@ static int fdp_nci_request_firmware(struct nci_dev *ndev) return r; }

- data = (u8 *) info->ram_patch->data; + data = info->ram_patch->data; info->ram_patch_version = data[FDP_FW_HEADER_SIZE] | (data[FDP_FW_HEADER_SIZE + 1] << 8) | @@ -610,9 +610,9 @@ static int fdp_nci_core_get_config_rsp_packet(struct nci_dev *ndev, { struct fdp_nci_info *info = nci_get_drvdata(ndev); struct device *dev = &info->phy->i2c_dev->dev; - struct nci_core_get_config_rsp *rsp = (void *) skb->data; + const struct nci_core_get_config_rsp *rsp = (void *) skb->data; unsigned int i; - u8 *p; + const u8 *p;

if (rsp->status == NCI_STATUS_OK) {

@@ -691,7 +691,7 @@ static const struct nci_ops nci_ops = { int fdp_nci_probe(struct fdp_i2c_phy *phy, const struct nfc_phy_ops *phy_ops, struct nci_dev **ndevp, int tx_headroom, int tx_tailroom, u8 clock_type, u32 clock_freq, - u8 *fw_vsc_cfg) + const u8 *fw_vsc_cfg) { struct device *dev = &phy->i2c_dev->dev; struct fdp_nci_info *info; diff --git a/drivers/nfc/fdp/fdp.h b/drivers/nfc/fdp/fdp.h index dc048d4b977e..2e9161a4d7bf 100644 --- a/drivers/nfc/fdp/fdp.h +++ b/drivers/nfc/fdp/fdp.h @@ -23,7 +23,7 @@ struct fdp_i2c_phy {

int fdp_nci_probe(struct fdp_i2c_phy *phy, const struct nfc_phy_ops *phy_ops, struct nci_dev **ndev, int tx_headroom, int tx_tailroom, - u8 clock_type, u32 clock_freq, u8 *fw_vsc_cfg); + u8 clock_type, u32 clock_freq, const u8 *fw_vsc_cfg); void fdp_nci_remove(struct nci_dev *ndev);

#endif /* __LOCAL_FDP_H_ */ diff --git a/drivers/nfc/fdp/i2c.c b/drivers/nfc/fdp/i2c.c index 98e1876c9468..051c43a2a52f 100644 --- a/drivers/nfc/fdp/i2c.c +++ b/drivers/nfc/fdp/i2c.c @@ -36,7 +36,7 @@ print_hex_dump(KERN_DEBUG, prefix": ", DUMP_PREFIX_OFFSET, \ 16, 1, (skb)->data, (skb)->len, 0)

-static void fdp_nci_i2c_reset(struct fdp_i2c_phy *phy) +static void fdp_nci_i2c_reset(const struct fdp_i2c_phy *phy) { /* Reset RST/WakeUP for at least 100 micro-second */ gpiod_set_value_cansleep(phy->power_gpio, FDP_POWER_OFF); @@ -47,7 +47,7 @@ static void fdp_nci_i2c_reset(struct fdp_i2c_phy *phy)

static int fdp_nci_i2c_enable(void *phy_id) { - struct fdp_i2c_phy *phy = phy_id; + const struct fdp_i2c_phy *phy = phy_id;

fdp_nci_i2c_reset(phy);

@@ -56,7 +56,7 @@ static int fdp_nci_i2c_enable(void *phy_id)

static void fdp_nci_i2c_disable(void *phy_id) { - struct fdp_i2c_phy *phy = phy_id; + const struct fdp_i2c_phy *phy = phy_id;

fdp_nci_i2c_reset(phy); } </cut>