CC: [email protected] CC: [email protected] CC: [email protected] TO: Thomas Zimmermann <[email protected]> CC: Maarten Lankhorst <[email protected]> CC: Patrik Jakobsson <[email protected]>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: eec4df26e24e978e49ccf9bcf49ca0f2ccdaeffe commit: 26499e0518a77de29e7db2c53fb0d0e9e15be8fb drm/gma500: Drop DRM_GMA3600 config option date: 11 months ago :::::: branch date: 25 hours ago :::::: commit date: 11 months ago config: i386-randconfig-c001-20211226 (https://download.01.org/0day-ci/archive/20211231/[email protected]/config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project a9e8b1ee7fd44b53c555a7823ae8fd1a8209c520) 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 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=26499e0518a77de29e7db2c53fb0d0e9e15be8fb git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 26499e0518a77de29e7db2c53fb0d0e9e15be8fb # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386 clang-analyzer If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> clang-analyzer warnings: (new ones prefixed by >>) ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/usb/serial/mos7840.c:1207:2: warning: Value stored to 'lData' is never read [clang-analyzer-deadcode.DeadStores] lData = LCR_BITS_8; ^ drivers/usb/serial/mos7840.c:1207:2: note: Value stored to 'lData' is never read drivers/usb/serial/mos7840.c:1208:2: warning: Value stored to 'lStop' is never read [clang-analyzer-deadcode.DeadStores] lStop = LCR_STOP_1; ^ drivers/usb/serial/mos7840.c:1208:2: note: Value stored to 'lStop' is never read drivers/usb/serial/mos7840.c:1311:2: warning: Value stored to 'status' is never read [clang-analyzer-deadcode.DeadStores] status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/usb/serial/mos7840.c:1311:2: note: Value stored to 'status' is never read status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 5 warnings generated. net/core/filter.c:1736:2: warning: Null pointer passed as 1st argument to memory set function [clang-analyzer-unix.cstring.NullArg] memset(to, 0, len); ^ net/core/filter.c:9948:57: note: Passing value via 3rd parameter 'to' return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); ^~ net/core/filter.c:9948:9: note: Calling '____bpf_skb_load_bytes' return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ net/core/filter.c:1725:15: note: Assuming 'offset' is <= 65535 if (unlikely(offset > 0xffff)) ^ include/linux/compiler.h:78:42: note: expanded from macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ net/core/filter.c:1725:2: note: Taking false branch if (unlikely(offset > 0xffff)) ^ net/core/filter.c:1729:15: note: Assuming 'ptr' is null if (unlikely(!ptr)) ^ include/linux/compiler.h:78:42: note: expanded from macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ net/core/filter.c:1729:2: note: Taking true branch if (unlikely(!ptr)) ^ net/core/filter.c:1730:3: note: Control jumps to line 1736 goto err_clear; ^ net/core/filter.c:1736:2: note: Null pointer passed as 1st argument to memory set function memset(to, 0, len); ^ ~~ net/core/filter.c:1770:2: warning: Null pointer passed as 1st argument to memory set function [clang-analyzer-unix.cstring.NullArg] memset(to, 0, len); ^ ~~ net/core/filter.c:1756:15: note: Assuming 'offset' is <= 65535 if (unlikely(offset > 0xffff)) ^ include/linux/compiler.h:78:42: note: expanded from macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ net/core/filter.c:1756:2: note: Taking false branch if (unlikely(offset > 0xffff)) ^ net/core/filter.c:1759:15: note: Assuming field 'skb' is non-null if (unlikely(!ctx->skb)) ^ include/linux/compiler.h:78:42: note: expanded from macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ net/core/filter.c:1759:2: note: Taking false branch if (unlikely(!ctx->skb)) ^ net/core/filter.c:1763:15: note: Assuming 'ptr' is null if (unlikely(!ptr)) ^ include/linux/compiler.h:78:42: note: expanded from macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ net/core/filter.c:1763:2: note: Taking true branch if (unlikely(!ptr)) ^ net/core/filter.c:1764:3: note: Control jumps to line 1770 goto err_clear; ^ net/core/filter.c:1770:2: note: Null pointer passed as 1st argument to memory set function memset(to, 0, len); ^ ~~ Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 3 warnings generated. drivers/gpu/drm/gma500/cdv_intel_display.c:761:2: warning: Value stored to 'dpll' is never read [clang-analyzer-deadcode.DeadStores] dpll |= DPLL_VCO_ENABLE; ^ drivers/gpu/drm/gma500/cdv_intel_display.c:761:2: note: Value stored to 'dpll' is never read Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 7 warnings generated. >> drivers/gpu/drm/gma500/cdv_intel_dp.c:863:2: warning: Null pointer passed as >> 2nd argument to string copy function [clang-analyzer-unix.cstring.NullArg] strncpy (intel_dp->adapter.name, name, sizeof(intel_dp->adapter.name) - 1); ^ drivers/gpu/drm/gma500/cdv_intel_dp.c:1960:2: note: 'name' initialized to a null pointer value const char *name = NULL; ^~~~~~~~~~~~~~~~ drivers/gpu/drm/gma500/cdv_intel_dp.c:1963:16: note: Calling 'kzalloc' gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:682:9: note: Calling 'kmalloc' return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:540:2: note: Taking false branch if (__builtin_constant_p(size)) { ^ include/linux/slab.h:557:2: note: Returning pointer, which participates in a condition later return __kmalloc(size, flags); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:682:9: note: Returning from 'kmalloc' return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:682:2: note: Returning pointer, which participates in a condition later return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/gma500/cdv_intel_dp.c:1963:16: note: Returning from 'kzalloc' gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/gma500/cdv_intel_dp.c:1964:6: note: Assuming 'gma_encoder' is non-null if (!gma_encoder) ^~~~~~~~~~~~ drivers/gpu/drm/gma500/cdv_intel_dp.c:1964:2: note: Taking false branch if (!gma_encoder) ^ drivers/gpu/drm/gma500/cdv_intel_dp.c:1966:25: note: Calling 'kzalloc' gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:682:9: note: Calling 'kmalloc' return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:540:2: note: Taking false branch if (__builtin_constant_p(size)) { ^ include/linux/slab.h:557:2: note: Returning pointer, which participates in a condition later return __kmalloc(size, flags); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:682:9: note: Returning from 'kmalloc' return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:682:2: note: Returning pointer, which participates in a condition later return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/gma500/cdv_intel_dp.c:1966:25: note: Returning from 'kzalloc' gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/gma500/cdv_intel_dp.c:1967:13: note: Assuming 'gma_connector' is non-null if (!gma_connector) ^~~~~~~~~~~~~~ drivers/gpu/drm/gma500/cdv_intel_dp.c:1967:9: note: Taking false branch if (!gma_connector) ^ drivers/gpu/drm/gma500/cdv_intel_dp.c:1969:13: note: Calling 'kzalloc' intel_dp = kzalloc(sizeof(struct cdv_intel_dp), GFP_KERNEL); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:682:9: note: Calling 'kmalloc' return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:540:2: note: Taking false branch if (__builtin_constant_p(size)) { ^ include/linux/slab.h:557:2: note: Returning pointer, which participates in a condition later return __kmalloc(size, flags); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:682:9: note: Returning from 'kmalloc' return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:682:2: note: Returning pointer, which participates in a condition later return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/gma500/cdv_intel_dp.c:1969:13: note: Returning from 'kzalloc' intel_dp = kzalloc(sizeof(struct cdv_intel_dp), GFP_KERNEL); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/gma500/cdv_intel_dp.c:1970:6: note: Assuming 'intel_dp' is non-null if (!intel_dp) ^~~~~~~~~ drivers/gpu/drm/gma500/cdv_intel_dp.c:1970:2: note: Taking false branch if (!intel_dp) ^ drivers/gpu/drm/gma500/cdv_intel_dp.c:1973:7: note: Assuming 'output_reg' is not equal to DP_C if ((output_reg == DP_C) && cdv_intel_dpc_is_edp(dev)) ^~~~~~~~~~~~~~~~~~ drivers/gpu/drm/gma500/cdv_intel_dp.c:1973:27: note: Left side of '&&' is false if ((output_reg == DP_C) && cdv_intel_dpc_is_edp(dev)) ^ drivers/gpu/drm/gma500/cdv_intel_dp.c:1984:6: note: 'type' is equal to DRM_MODE_CONNECTOR_DisplayPort if (type == DRM_MODE_CONNECTOR_DisplayPort) ^~~~ drivers/gpu/drm/gma500/cdv_intel_dp.c:1984:2: note: Taking true branch if (type == DRM_MODE_CONNECTOR_DisplayPort) ^ drivers/gpu/drm/gma500/cdv_intel_dp.c:2004:2: note: 'Default' branch taken. Execution continues on line 2015 switch (output_reg) { vim +863 drivers/gpu/drm/gma500/cdv_intel_dp.c 8695b612943561 Alan Cox 2012-08-08 846 8695b612943561 Alan Cox 2012-08-08 847 static int 367e44080e20f7 Patrik Jakobsson 2013-07-22 848 cdv_intel_dp_i2c_init(struct gma_connector *connector, 367e44080e20f7 Patrik Jakobsson 2013-07-22 849 struct gma_encoder *encoder, const char *name) 8695b612943561 Alan Cox 2012-08-08 850 { 37e7b184da18a9 Alan Cox 2012-08-08 851 struct cdv_intel_dp *intel_dp = encoder->dev_priv; d112a8163f8375 Zhao Yakui 2012-08-08 852 int ret; d112a8163f8375 Zhao Yakui 2012-08-08 853 8695b612943561 Alan Cox 2012-08-08 854 DRM_DEBUG_KMS("i2c_init %s\n", name); d112a8163f8375 Zhao Yakui 2012-08-08 855 8695b612943561 Alan Cox 2012-08-08 856 intel_dp->algo.running = false; 8695b612943561 Alan Cox 2012-08-08 857 intel_dp->algo.address = 0; 37e7b184da18a9 Alan Cox 2012-08-08 858 intel_dp->algo.aux_ch = cdv_intel_dp_i2c_aux_ch; 8695b612943561 Alan Cox 2012-08-08 859 8695b612943561 Alan Cox 2012-08-08 860 memset(&intel_dp->adapter, '\0', sizeof (intel_dp->adapter)); 8695b612943561 Alan Cox 2012-08-08 861 intel_dp->adapter.owner = THIS_MODULE; 8695b612943561 Alan Cox 2012-08-08 862 intel_dp->adapter.class = I2C_CLASS_DDC; 8695b612943561 Alan Cox 2012-08-08 @863 strncpy (intel_dp->adapter.name, name, sizeof(intel_dp->adapter.name) - 1); 8695b612943561 Alan Cox 2012-08-08 864 intel_dp->adapter.name[sizeof(intel_dp->adapter.name) - 1] = '\0'; 8695b612943561 Alan Cox 2012-08-08 865 intel_dp->adapter.algo_data = &intel_dp->algo; 5bdebb183c9702 Dave Airlie 2013-10-11 866 intel_dp->adapter.dev.parent = connector->base.kdev; 8695b612943561 Alan Cox 2012-08-08 867 d112a8163f8375 Zhao Yakui 2012-08-08 868 if (is_edp(encoder)) d112a8163f8375 Zhao Yakui 2012-08-08 869 cdv_intel_edp_panel_vdd_on(encoder); d112a8163f8375 Zhao Yakui 2012-08-08 870 ret = i2c_dp_aux_add_bus(&intel_dp->adapter); d112a8163f8375 Zhao Yakui 2012-08-08 871 if (is_edp(encoder)) d112a8163f8375 Zhao Yakui 2012-08-08 872 cdv_intel_edp_panel_vdd_off(encoder); d112a8163f8375 Zhao Yakui 2012-08-08 873 d112a8163f8375 Zhao Yakui 2012-08-08 874 return ret; d112a8163f8375 Zhao Yakui 2012-08-08 875 } d112a8163f8375 Zhao Yakui 2012-08-08 876 :::::: The code at line 863 was first introduced by commit :::::: 8695b612943561478fd22f28f45e5692e5d078db gma500: Add the support of display port on CDV :::::: TO: Alan Cox <[email protected]> :::::: CC: Dave Airlie <[email protected]> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected] _______________________________________________ kbuild mailing list -- [email protected] To unsubscribe send an email to [email protected]
