:::::: :::::: Manual check reason: "low confidence static check warning: drivers/media/platform/st/sti/delta/delta-v4l2.c:63:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores]" :::::: CC: llvm(a)lists.linux.dev CC: kbuild-all(a)lists.01.org BCC: lkp(a)intel.com CC: linux-kernel(a)vger.kernel.org TO: Mauro Carvalho Chehab CC: linux-media(a)vger.kernel.org tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 50fd82b3a9a9335df5d50c7ddcb81c81d358c4fc commit: e7b8153e2a4f0c9c8d1450aa7328d54ea64fe8b2 media: platform: place stm32/ and sti/ under st/ dir date: 3 months ago :::::: branch date: 5 hours ago :::::: commit date: 3 months ago config: arm-randconfig-c002-20220531 (https://download.01.org/0day-ci/archive/20220603/202206031117.sZPa7VLG-lkp(a)intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c825abd6b0198fb088d9752f556a70705bc99dfd) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e7b8153e2a4f0c9c8d1450aa7328d54ea64fe8b2 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout e7b8153e2a4f0c9c8d1450aa7328d54ea64fe8b2 # save the config file COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm clang-analyzer If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot clang-analyzer warnings: (new ones prefixed by >>) __cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op)) ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:31:25: note: expanded from macro '__cmp_once' typeof(x) unique_x = (x); \ ^ drivers/hwmon/max31730.c:219:8: note: '?' condition is false val = clamp_val(val, MAX31730_TEMP_MIN, MAX31730_TEMP_MAX); ^ include/linux/minmax.h:137:32: note: expanded from macro 'clamp_val' #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi) ^ include/linux/minmax.h:124:48: note: expanded from macro 'clamp_t' #define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi) ^ include/linux/minmax.h:112:27: note: expanded from macro 'max_t' #define max_t(type, x, y) __careful_cmp((type)(x), (type)(y), >) ^ include/linux/minmax.h:38:3: note: expanded from macro '__careful_cmp' __cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op)) ^ include/linux/minmax.h:33:3: note: expanded from macro '__cmp_once' __cmp(unique_x, unique_y, op); }) ^ include/linux/minmax.h:28:26: note: expanded from macro '__cmp' #define __cmp(x, y, op) ((x) op (y) ? (x) : (y)) ^ drivers/hwmon/max31730.c:219:8: note: '__UNIQUE_ID___x243' is < '__UNIQUE_ID___y244' val = clamp_val(val, MAX31730_TEMP_MIN, MAX31730_TEMP_MAX); ^ include/linux/minmax.h:137:32: note: expanded from macro 'clamp_val' #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:124:36: note: expanded from macro 'clamp_t' #define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:104:27: note: expanded from macro 'min_t' #define min_t(type, x, y) __careful_cmp((type)(x), (type)(y), <) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:38:3: note: expanded from macro '__careful_cmp' __cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:33:3: note: expanded from macro '__cmp_once' __cmp(unique_x, unique_y, op); }) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/minmax.h:28:26: note: expanded from macro '__cmp' #define __cmp(x, y, op) ((x) op (y) ? (x) : (y)) ^~~ drivers/hwmon/max31730.c:219:8: note: '?' condition is true val = clamp_val(val, MAX31730_TEMP_MIN, MAX31730_TEMP_MAX); ^ include/linux/minmax.h:137:32: note: expanded from macro 'clamp_val' #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi) ^ include/linux/minmax.h:124:36: note: expanded from macro 'clamp_t' #define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi) ^ include/linux/minmax.h:104:27: note: expanded from macro 'min_t' #define min_t(type, x, y) __careful_cmp((type)(x), (type)(y), <) ^ include/linux/minmax.h:38:3: note: expanded from macro '__careful_cmp' __cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op)) ^ include/linux/minmax.h:33:3: note: expanded from macro '__cmp_once' __cmp(unique_x, unique_y, op); }) ^ include/linux/minmax.h:28:26: note: expanded from macro '__cmp' #define __cmp(x, y, op) ((x) op (y) ? (x) : (y)) ^ drivers/hwmon/max31730.c:219:2: note: The value -128000 is assigned to 'val' val = clamp_val(val, MAX31730_TEMP_MIN, MAX31730_TEMP_MAX); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/hwmon/max31730.c:220:30: note: The result of the left shift is undefined because the left operand is negative val = DIV_ROUND_CLOSEST(val << 4, 1000) << 4; ^ include/linux/math.h:87:18: note: expanded from macro 'DIV_ROUND_CLOSEST' typeof(x) __x = x; \ ^ 1 warning generated. Suppressed 1 warnings (1 with check filters). 1 warning generated. Suppressed 1 warnings (1 with check filters). 3 warnings generated. drivers/media/platform/st/sti/bdisp/bdisp-v4l2.c:699:20: warning: Value stored to 'ctx' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct bdisp_ctx *ctx = fh_to_ctx(fh); ^~~ drivers/media/platform/st/sti/bdisp/bdisp-v4l2.c:699:20: note: Value stored to 'ctx' during its initialization is never read struct bdisp_ctx *ctx = fh_to_ctx(fh); ^~~ drivers/media/platform/st/sti/bdisp/bdisp-v4l2.c:743:20: warning: Value stored to 'ctx' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct bdisp_ctx *ctx = fh_to_ctx(fh); ^~~ drivers/media/platform/st/sti/bdisp/bdisp-v4l2.c:743:20: note: Value stored to 'ctx' during its initialization is never read struct bdisp_ctx *ctx = fh_to_ctx(fh); ^~~ Suppressed 1 warnings (1 with check filters). 1 warning generated. Suppressed 1 warnings (1 with check filters). 1 warning generated. Suppressed 1 warnings (1 with check filters). 22 warnings generated. >> drivers/media/platform/st/sti/delta/delta-v4l2.c:63:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:63:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ >> drivers/media/platform/st/sti/delta/delta-v4l2.c:65:6: warning: Value stored to 'data' during its initialization is never read [clang-analyzer-deadcode.DeadStores] u8 *data = (u8 *)(au->vaddr); ^~~~ ~~~~~~~~~~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:65:6: note: Value stored to 'data' during its initialization is never read u8 *data = (u8 *)(au->vaddr); ^~~~ ~~~~~~~~~~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:79:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:79:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:81:6: warning: Value stored to 'data' during its initialization is never read [clang-analyzer-deadcode.DeadStores] u8 *data = (u8 *)(frame->vaddr); ^~~~ ~~~~~~~~~~~~~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:81:6: note: Value stored to 'data' during its initialization is never read u8 *data = (u8 *)(frame->vaddr); ^~~~ ~~~~~~~~~~~~~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:428:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:428:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ >> drivers/media/platform/st/sti/delta/delta-v4l2.c:431:16: warning: Value stored to 'str' during its initialization is never read [clang-analyzer-deadcode.DeadStores] unsigned char str[100] = ""; ^~~ ~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:431:16: note: Value stored to 'str' during its initialization is never read unsigned char str[100] = ""; ^~~ ~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:456:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:456:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:460:16: warning: Value stored to 'str' during its initialization is never read [clang-analyzer-deadcode.DeadStores] unsigned char str[100] = ""; ^~~ ~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:460:16: note: Value stored to 'str' during its initialization is never read unsigned char str[100] = ""; ^~~ ~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:495:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:495:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:549:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:549:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:609:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:609:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:645:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:645:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:649:16: warning: Value stored to 'str' during its initialization is never read [clang-analyzer-deadcode.DeadStores] unsigned char str[100] = ""; ^~~ ~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:649:16: note: Value stored to 'str' during its initialization is never read unsigned char str[100] = ""; ^~~ ~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:766:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:766:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:809:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:809:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:1045:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:1045:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:1055:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:1055:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:1118:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:1118:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ >> drivers/media/platform/st/sti/delta/delta-v4l2.c:1314:16: warning: Value stored to 'str1' during its initialization is never read [clang-analyzer-deadcode.DeadStores] unsigned char str1[100] = ""; ^~~~ ~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:1314:16: note: Value stored to 'str1' during its initialization is never read unsigned char str1[100] = ""; ^~~~ ~~ >> drivers/media/platform/st/sti/delta/delta-v4l2.c:1315:16: warning: Value stored to 'str2' during its initialization is never read [clang-analyzer-deadcode.DeadStores] unsigned char str2[100] = ""; ^~~~ ~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:1315:16: note: Value stored to 'str2' during its initialization is never read unsigned char str2[100] = ""; ^~~~ ~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:1420:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-v4l2.c:1420:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ Suppressed 1 warnings (1 with check filters). 1 warning generated. drivers/mtd/nand/raw/nand_bbt.c:579:3: warning: Value stored to 'bbtblocks' is never read [clang-analyzer-deadcode.DeadStores] bbtblocks = mtd->size >> this->bbt_erase_shift; ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/mtd/nand/raw/nand_bbt.c:579:3: note: Value stored to 'bbtblocks' is never read bbtblocks = mtd->size >> this->bbt_erase_shift; ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2 warnings generated. drivers/mtd/nand/raw/nand_onfi.c:254:6: warning: The result of the left shift is undefined because the right operand is negative [clang-analyzer-core.UndefinedBinaryOperatorResult] 1 << (fls(le32_to_cpu(p->pages_per_block)) - 1); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/mtd/nand/raw/nand_onfi.c:147:25: note: Calling 'nand_to_mtd' struct mtd_info *mtd = nand_to_mtd(chip); ^~~~~~~~~~~~~~~~~ include/linux/mtd/rawnand.h:1315:2: note: Returning without writing to 'chip->parameters.model', which participates in a condition later return &chip->base.mtd; ^ drivers/mtd/nand/raw/nand_onfi.c:147:25: note: Returning from 'nand_to_mtd' struct mtd_info *mtd = nand_to_mtd(chip); ^~~~~~~~~~~~~~~~~ drivers/mtd/nand/raw/nand_onfi.c:161:6: note: Assuming 'ret' is 0 if (ret || strncmp(id, "ONFI", 4)) ^~~ drivers/mtd/nand/raw/nand_onfi.c:161:6: note: Left side of '||' is false drivers/mtd/nand/raw/nand_onfi.c:161:13: note: Assuming the condition is false if (ret || strncmp(id, "ONFI", 4)) ^~~~~~~~~~~~~~~~~~~~~~ drivers/mtd/nand/raw/nand_onfi.c:161:2: note: Taking false branch if (ret || strncmp(id, "ONFI", 4)) ^ drivers/mtd/nand/raw/nand_onfi.c:165:9: note: Calling 'kzalloc' pbuf = kzalloc((sizeof(*pbuf) * ONFI_PARAM_PAGES), GFP_KERNEL); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:715:9: note: Calling 'kmalloc' return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:569:2: note: Taking false branch if (__builtin_constant_p(size)) { ^ include/linux/slab.h:586:2: note: Returning pointer, which participates in a condition later return __kmalloc(size, flags); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:715:9: note: Returning from 'kmalloc' return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:715:2: note: Returning pointer, which participates in a condition later return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/mtd/nand/raw/nand_onfi.c:165:9: note: Returning from 'kzalloc' pbuf = kzalloc((sizeof(*pbuf) * ONFI_PARAM_PAGES), GFP_KERNEL); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/mtd/nand/raw/nand_onfi.c:166:6: note: Assuming 'pbuf' is non-null if (!pbuf) ^~~~~ drivers/mtd/nand/raw/nand_onfi.c:166:2: note: Taking false branch if (!pbuf) ^ drivers/mtd/nand/raw/nand_onfi.c:169:7: note: Calling 'nand_has_exec_op' if (!nand_has_exec_op(chip) || ^~~~~~~~~~~~~~~~~~~~~~ drivers/mtd/nand/raw/internals.h:117:6: note: Assuming field 'controller' is null if (!chip->controller || !chip->controller->ops || ^~~~~~~~~~~~~~~~~ drivers/mtd/nand/raw/internals.h:117:24: note: Left side of '||' is true if (!chip->controller || !chip->controller->ops || ^ drivers/mtd/nand/raw/internals.h:119:3: note: Returning without writing to 'chip->parameters.model', which participates in a condition later return false; ^ drivers/mtd/nand/raw/nand_onfi.c:169:7: note: Returning from 'nand_has_exec_op' if (!nand_has_exec_op(chip) || ^~~~~~~~~~~~~~~~~~~~~~ drivers/mtd/nand/raw/nand_onfi.c:169:30: note: Left side of '||' is true if (!nand_has_exec_op(chip) || ^ drivers/mtd/nand/raw/nand_onfi.c:173:2: note: Loop condition is true. Entering loop body for (i = 0; i < ONFI_PARAM_PAGES; i++) { ^ drivers/mtd/nand/raw/nand_onfi.c:174:8: note: 'i' is 0 if (!i) ^ drivers/mtd/nand/raw/nand_onfi.c:174:3: note: Taking true branch if (!i) ^ drivers/mtd/nand/raw/nand_onfi.c:184:7: note: Assuming 'ret' is 0 if (ret) { ^~~ drivers/mtd/nand/raw/nand_onfi.c:184:3: note: Taking false branch -- if (0) \ ^ drivers/i2c/busses/i2c-highlander.c:262:23: note: The value 2 is assigned to 'i' for (i = 0; i < cnt; i++) { ^~~ drivers/i2c/busses/i2c-highlander.c:262:14: note: Assuming 'i' is < 'cnt' for (i = 0; i < cnt; i++) { ^~~~~~~ drivers/i2c/busses/i2c-highlander.c:262:2: note: Loop condition is true. Entering loop body for (i = 0; i < cnt; i++) { ^ drivers/i2c/busses/i2c-highlander.c:263:3: note: 1st function call argument is an uninitialized value iowrite16(data[i], dev->base + SMTRDR + (i * sizeof(u16))); ^ ~~~~~~~ include/asm-generic/io.h:751:19: note: expanded from macro 'iowrite16' #define iowrite16 iowrite16 ^ include/uapi/linux/swab.h:176:9: warning: 1st function call argument is an uninitialized value [clang-analyzer-core.CallAndMessage] return __swab16(*p); ^ include/uapi/linux/swab.h:102:28: note: expanded from macro '__swab16' #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) ^ drivers/i2c/busses/i2c-highlander.c:285:2: note: Taking false branch dev_dbg(dev->dev, "addr %04x, command %02x, read_write %d, size %d\n", ^ include/linux/dev_printk.h:162:2: note: expanded from macro 'dev_dbg' if (0) \ ^ drivers/i2c/busses/i2c-highlander.c:291:2: note: Control jumps to 'case 8:' at line 296 switch (size) { ^ drivers/i2c/busses/i2c-highlander.c:299:3: note: Execution continues on line 308 break; ^ drivers/i2c/busses/i2c-highlander.c:311:2: note: Control jumps to 'case 32:' at line 321 switch (dev->buf_len) { ^ drivers/i2c/busses/i2c-highlander.c:323:3: note: Execution continues on line 329 break; ^ drivers/i2c/busses/i2c-highlander.c:339:6: note: Assuming 'read_write' is equal to I2C_SMBUS_READ if (read_write == I2C_SMBUS_READ) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/i2c/busses/i2c-highlander.c:339:2: note: Taking true branch if (read_write == I2C_SMBUS_READ) ^ drivers/i2c/busses/i2c-highlander.c:340:10: note: Calling 'highlander_i2c_read' return highlander_i2c_read(dev); ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/i2c/busses/i2c-highlander.c:214:6: note: Assuming the condition is false if (highlander_i2c_wait_for_bbsy(dev)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/i2c/busses/i2c-highlander.c:214:2: note: Taking false branch if (highlander_i2c_wait_for_bbsy(dev)) ^ drivers/i2c/busses/i2c-highlander.c:219:2: note: Taking false branch if (highlander_i2c_wait_xfer_done(dev)) { ^ drivers/i2c/busses/i2c-highlander.c:236:6: note: Assuming 'iic_read_delay' is 0 if (iic_read_delay && time_before(jiffies, dev->last_read_time + ^~~~~~~~~~~~~~ drivers/i2c/busses/i2c-highlander.c:236:21: note: Left side of '&&' is false if (iic_read_delay && time_before(jiffies, dev->last_read_time + ^ drivers/i2c/busses/i2c-highlander.c:242:14: note: Assuming 'i' is >= 'cnt' for (i = 0; i < cnt; i++) { ^~~~~~~ drivers/i2c/busses/i2c-highlander.c:242:2: note: Loop condition is false. Execution continues on line 247 for (i = 0; i < cnt; i++) { ^ drivers/i2c/busses/i2c-highlander.c:247:2: note: Calling 'smbus_read_data' smbus_read_data(data, dev->buf, dev->buf_len); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/i2c/busses/i2c-highlander.c:102:9: note: Assuming 'len' is > 1 for (; len > 1; len -= 2) { ^~~~~~~ drivers/i2c/busses/i2c-highlander.c:102:2: note: Loop condition is true. Entering loop body for (; len > 1; len -= 2) { ^ drivers/i2c/busses/i2c-highlander.c:103:20: note: Calling '__cpu_to_be16p' *(__be16 *)dst = cpu_to_be16p(src++); ^ include/linux/byteorder/generic.h:108:22: note: expanded from macro 'cpu_to_be16p' #define cpu_to_be16p __cpu_to_be16p ^ include/uapi/linux/byteorder/little_endian.h:87:25: note: Calling '__swab16p' return (__force __be16)__swab16p(p); ^~~~~~~~~~~~ include/uapi/linux/swab.h:176:9: note: 1st function call argument is an uninitialized value return __swab16(*p); ^ include/uapi/linux/swab.h:102:28: note: expanded from macro '__swab16' #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) ^ ~~~~~~~~~~ 1 warning generated. Suppressed 1 warnings (1 with check filters). 1 warning generated. Suppressed 1 warnings (1 with check filters). 4 warnings generated. >> drivers/media/platform/st/sti/delta/delta-debug.c:57:20: warning: Value stored to 'delta' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ drivers/media/platform/st/sti/delta/delta-debug.c:57:20: note: Value stored to 'delta' during its initialization is never read struct delta_dev *delta = ctx->dev; ^~~~~ ~~~~~~~~ >> drivers/media/platform/st/sti/delta/delta-debug.c:58:27: warning: Value stored to 's' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct delta_streaminfo *s = &ctx->streaminfo; ^ ~~~~~~~~~~~~~~~~ drivers/media/platform/st/sti/delta/delta-debug.c:58:27: note: Value stored to 's' during its initialization is never read struct delta_streaminfo *s = &ctx->streaminfo; ^ ~~~~~~~~~~~~~~~~ >> drivers/media/platform/st/sti/delta/delta-debug.c:59:16: warning: Value stored to 'str' during its initialization is never read [clang-analyzer-deadcode.DeadStores] unsigned char str[100] = ""; ^~~ ~~ drivers/media/platform/st/sti/delta/delta-debug.c:59:16: note: Value stored to 'str' during its initialization is never read unsigned char str[100] = ""; ^~~ ~~ Suppressed 1 warnings (1 with check filters). 1 warning generated. Suppressed 1 warnings (1 with check filters). 3 warnings generated. >> drivers/media/platform/st/sti/delta/delta-mjpeg-dec.c:41:2: warning: Value stored to 'b' is never read [clang-analyzer-deadcode.DeadStores] b += snprintf(b, len, ^ ~~~~~~~~~~~~~~~~ drivers/media/platform/st/sti/delta/delta-mjpeg-dec.c:41:2: note: Value stored to 'b' is never read b += snprintf(b, len, ^ ~~~~~~~~~~~~~~~~ drivers/media/platform/st/sti/delta/delta-mjpeg-dec.c:59:2: warning: Value stored to 'b' is never read [clang-analyzer-deadcode.DeadStores] b += snprintf(b, len, ^ ~~~~~~~~~~~~~~~~ drivers/media/platform/st/sti/delta/delta-mjpeg-dec.c:59:2: note: Value stored to 'b' is never read b += snprintf(b, len, ^ ~~~~~~~~~~~~~~~~ Suppressed 1 warnings (1 with check filters). 16 warnings generated. drivers/media/platform/st/sti/hva/hva-v4l2.c:230:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:230:17: note: Value stored to 'dev' during its initialization is never read struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:231:25: warning: Value stored to 'stream' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct hva_streaminfo *stream = &ctx->streaminfo; ^~~~~~ ~~~~~~~~~~~~~~~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:231:25: note: Value stored to 'stream' during its initialization is never read struct hva_streaminfo *stream = &ctx->streaminfo; ^~~~~~ ~~~~~~~~~~~~~~~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:232:24: warning: Value stored to 'frame' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct hva_frameinfo *frame = &ctx->frameinfo; ^~~~~ ~~~~~~~~~~~~~~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:232:24: note: Value stored to 'frame' during its initialization is never read struct hva_frameinfo *frame = &ctx->frameinfo; ^~~~~ ~~~~~~~~~~~~~~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:339:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:339:17: note: Value stored to 'dev' during its initialization is never read struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:403:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:403:17: note: Value stored to 'dev' during its initialization is never read struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:453:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:453:17: note: Value stored to 'dev' during its initialization is never read struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:483:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:483:17: note: Value stored to 'dev' during its initialization is never read struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:557:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:557:17: note: Value stored to 'dev' during its initialization is never read struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:620:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:620:17: note: Value stored to 'dev' during its initialization is never read struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:695:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:695:17: note: Value stored to 'dev' during its initialization is never read struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:866:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:866:17: note: Value stored to 'dev' during its initialization is never read struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:876:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:876:17: note: Value stored to 'dev' during its initialization is never read struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:914:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:914:17: note: Value stored to 'dev' during its initialization is never read struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:936:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:936:17: note: Value stored to 'dev' during its initialization is never read struct device *dev = ctx_to_dev(ctx); ^~~ drivers/media/platform/st/sti/hva/hva-v4l2.c:1069:17: warning: Value stored to 'dev' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct device *dev = ctx_to_dev(ctx); ^~~ vim +/delta +63 drivers/media/platform/st/sti/delta/delta-v4l2.c f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 60 f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 61 static void dump_au(struct delta_ctx *ctx, struct delta_au *au) f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 62 { f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 @63 struct delta_dev *delta = ctx->dev; f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 64 u32 size = 10; /* dump first & last 10 bytes */ f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 @65 u8 *data = (u8 *)(au->vaddr); f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 66 f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 67 if (au->size <= (size * 2)) f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 68 dev_dbg(delta->dev, "%s dump au[%d] dts=%lld size=%d data=%*ph\n", f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 69 ctx->name, au->vbuf.vb2_buf.index, au->dts, au->size, f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 70 au->size, data); f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 71 else f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 72 dev_dbg(delta->dev, "%s dump au[%d] dts=%lld size=%d data=%*ph..%*ph\n", f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 73 ctx->name, au->vbuf.vb2_buf.index, au->dts, au->size, f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 74 size, data, size, data + au->size - size); f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 75 } f386509e495945 drivers/media/platform/sti/delta/delta-v4l2.c Hugues Fruchet 2017-02-02 76 :::::: The code at line 63 was first introduced by commit :::::: f386509e49594591f80af2e5a73d4c9ce389aa29 [media] st-delta: STiH4xx multi-format video decoder v4l2 driver :::::: TO: Hugues Fruchet :::::: CC: Mauro Carvalho Chehab -- 0-DAY CI Kernel Test Service https://01.org/lkp