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: Chris Down <chris(a)chrisdown.name&gt; CC: Petr Mladek <pmladek(a)suse.com&gt; tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 8013d1d3d2e33236dee13a133fba49ad55045e79 commit: 337015573718b161891a3473d25f59273f2e626b printk: Userspace format indexing support date: 10 months ago :::::: branch date: 19 hours ago :::::: commit date: 10 months ago config: arm-randconfig-c002-20220428 (https://download.01.org/0day-ci/archive/20220501/202205010156.eMTNAlU0-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c59473aacce38cd7dd77eebceaf3c98c5707ab3b) 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... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 337015573718b161891a3473d25f59273f2e626b # 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 as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; clang-analyzer warnings: (new ones prefixed by >>) Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 10 warnings generated. Suppressed 10 warnings (10 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 4 warnings generated. lib/rbtree_test.c:309:3: warning: Value stored to 'node' is never read [clang-analyzer-deadcode.DeadStores] node = rb_first(&root.rb_root); ^ ~~~~~~~~~~~~~~~~~~~~~~~ lib/rbtree_test.c:309:3: note: Value stored to 'node' is never read node = rb_first(&root.rb_root); ^ ~~~~~~~~~~~~~~~~~~~~~~~ lib/rbtree_test.c:321:3: warning: Value stored to 'node' is never read [clang-analyzer-deadcode.DeadStores] node = rb_first_cached(&root); ^ lib/rbtree_test.c:321:3: note: Value stored to 'node' 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. 2 warnings generated. 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. 2 warnings generated. 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. 2 warnings generated. 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. 8 warnings generated. Suppressed 8 warnings (8 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. 9 warnings generated. drivers/gpu/drm/radeon/radeon_drv.c:467:2: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores] ret = radeon_resume_kms(drm_dev, false, false); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_drv.c:467:2: note: Value stored to 'ret' is never read ret = radeon_resume_kms(drm_dev, false, false); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 8 warnings generated. Suppressed 8 warnings (8 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. 58 warnings generated. rdev->pm.power_state[rdev->pm.default_power_state_index].clock_info[0].voltage.voltage; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_atombios.c:2765:6: note: Assuming the condition is true if (atom_parse_data_header(mode_info->atom_context, index, NULL, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_atombios.c:2765:2: note: Taking true branch if (atom_parse_data_header(mode_info->atom_context, index, NULL, ^ drivers/gpu/drm/radeon/radeon_atombios.c:2767:3: note: Control jumps to 'case 5:' at line 2774 switch (frev) { ^ drivers/gpu/drm/radeon/radeon_atombios.c:2776:4: note: Execution continues on line 2785 break; ^ drivers/gpu/drm/radeon/radeon_atombios.c:2785:6: note: 'state_index' is equal to 0 if (state_index == 0) { ^~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_atombios.c:2785:2: note: Taking true branch if (state_index == 0) { ^ drivers/gpu/drm/radeon/radeon_atombios.c:2786:26: note: Calling 'kzalloc' rdev->pm.power_state = kzalloc(sizeof(struct radeon_power_state), GFP_KERNEL); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:721:9: note: Calling 'kmalloc' return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:579:2: note: Taking false branch if (__builtin_constant_p(size)) { ^ include/linux/slab.h:596:2: note: Returning pointer return __kmalloc(size, flags); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:721:9: note: Returning from 'kmalloc' return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/slab.h:721:2: note: Returning pointer return kmalloc(size, flags | __GFP_ZERO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_atombios.c:2786:26: note: Returning from 'kzalloc' rdev->pm.power_state = kzalloc(sizeof(struct radeon_power_state), GFP_KERNEL); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_atombios.c:2786:3: note: Value assigned to field 'power_state' rdev->pm.power_state = kzalloc(sizeof(struct radeon_power_state), GFP_KERNEL); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_atombios.c:2787:7: note: Assuming field 'power_state' is null if (rdev->pm.power_state) { ^~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_atombios.c:2787:3: note: Taking false branch if (rdev->pm.power_state) { ^ drivers/gpu/drm/radeon/radeon_atombios.c:2814:6: note: Assuming field 'default_power_state_index' is >= 0 if (rdev->pm.default_power_state_index >= 0) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_atombios.c:2814:2: note: Taking true branch if (rdev->pm.default_power_state_index >= 0) ^ drivers/gpu/drm/radeon/radeon_atombios.c:2816:4: note: Dereference of null pointer rdev->pm.power_state[rdev->pm.default_power_state_index].clock_info[0].voltage.voltage; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Suppressed 57 warnings (8 in non-user code, 49 with check filters). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. 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. 21 warnings generated. kernel/sched/core.c:5206:16: warning: Value stored to 'preempt_disable_ip' during its initialization is never read [clang-analyzer-deadcode.DeadStores] unsigned long preempt_disable_ip = get_preempt_disable_ip(current); ^~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/core.c:5206:16: note: Value stored to 'preempt_disable_ip' during its initialization is never read unsigned long preempt_disable_ip = get_preempt_disable_ip(current); ^~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/core.c:5940:3: warning: Value stored to 'rq' is never read [clang-analyzer-deadcode.DeadStores] rq = context_switch(rq, prev, next, &rf); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/core.c:5940:3: note: Value stored to 'rq' is never read rq = context_switch(rq, prev, next, &rf); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/sched/core.c:8938:3: warning: Value stored to 'ptr' is never read [clang-analyzer-deadcode.DeadStores] ptr += nr_cpu_ids * sizeof(void **); ^ kernel/sched/core.c:8938:3: note: Value stored to 'ptr' is never read Suppressed 18 warnings (12 in non-user code, 6 with check filters). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 10 warnings generated. Suppressed 10 warnings (10 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. 10 warnings generated. Suppressed 10 warnings (10 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. 11 warnings generated. kernel/sched/cputime.c:570:3: warning: Value stored to 'utime' is never read [clang-analyzer-deadcode.DeadStores] utime = rtime; ^ ~~~~~ kernel/sched/cputime.c:570:3: note: Value stored to 'utime' is never read utime = rtime; ^ ~~~~~ Suppressed 10 warnings (10 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. 10 warnings generated. Suppressed 10 warnings (10 in non-user code). vim +2816 drivers/gpu/drm/radeon/radeon_atombios.c b0e664140a1703 Alex Deucher 2010-11-22 2754 560154e9a27f2f Alex Deucher 2010-11-22 2755 void radeon_atombios_get_power_modes(struct radeon_device *rdev) 560154e9a27f2f Alex Deucher 2010-11-22 2756 { 560154e9a27f2f Alex Deucher 2010-11-22 2757 struct radeon_mode_info *mode_info = &rdev->mode_info; 560154e9a27f2f Alex Deucher 2010-11-22 2758 int index = GetIndexIntoMasterTable(DATA, PowerPlayInfo); 560154e9a27f2f Alex Deucher 2010-11-22 2759 u16 data_offset; 560154e9a27f2f Alex Deucher 2010-11-22 2760 u8 frev, crev; 560154e9a27f2f Alex Deucher 2010-11-22 2761 int state_index = 0; 560154e9a27f2f Alex Deucher 2010-11-22 2762 560154e9a27f2f Alex Deucher 2010-11-22 2763 rdev->pm.default_power_state_index = -1; 560154e9a27f2f Alex Deucher 2010-11-22 2764 560154e9a27f2f Alex Deucher 2010-11-22 2765 if (atom_parse_data_header(mode_info->atom_context, index, NULL, 560154e9a27f2f Alex Deucher 2010-11-22 2766 &frev, &crev, &data_offset)) { 560154e9a27f2f Alex Deucher 2010-11-22 2767 switch (frev) { 560154e9a27f2f Alex Deucher 2010-11-22 2768 case 1: 560154e9a27f2f Alex Deucher 2010-11-22 2769 case 2: 560154e9a27f2f Alex Deucher 2010-11-22 2770 case 3: 560154e9a27f2f Alex Deucher 2010-11-22 2771 state_index = radeon_atombios_parse_power_table_1_3(rdev); 560154e9a27f2f Alex Deucher 2010-11-22 2772 break; 560154e9a27f2f Alex Deucher 2010-11-22 2773 case 4: 560154e9a27f2f Alex Deucher 2010-11-22 2774 case 5: 560154e9a27f2f Alex Deucher 2010-11-22 2775 state_index = radeon_atombios_parse_power_table_4_5(rdev); 560154e9a27f2f Alex Deucher 2010-11-22 2776 break; b0e664140a1703 Alex Deucher 2010-11-22 2777 case 6: b0e664140a1703 Alex Deucher 2010-11-22 2778 state_index = radeon_atombios_parse_power_table_6(rdev); b0e664140a1703 Alex Deucher 2010-11-22 2779 break; 560154e9a27f2f Alex Deucher 2010-11-22 2780 default: 560154e9a27f2f Alex Deucher 2010-11-22 2781 break; 56278a8edacee9 Alex Deucher 2009-12-28 2782 } f8e6bfc2ce1628 Alex Deucher 2013-04-25 2783 } f8e6bfc2ce1628 Alex Deucher 2013-04-25 2784 f8e6bfc2ce1628 Alex Deucher 2013-04-25 2785 if (state_index == 0) { 0975b16274bad1 Alex Deucher 2011-02-02 2786 rdev->pm.power_state = kzalloc(sizeof(struct radeon_power_state), GFP_KERNEL); 0975b16274bad1 Alex Deucher 2011-02-02 2787 if (rdev->pm.power_state) { 8f3f1c9a22a642 Alex Deucher 2011-11-04 2788 rdev->pm.power_state[0].clock_info = 6396bb221514d2 Kees Cook 2018-06-12 2789 kcalloc(1, 6396bb221514d2 Kees Cook 2018-06-12 2790 sizeof(struct radeon_pm_clock_info), 6396bb221514d2 Kees Cook 2018-06-12 2791 GFP_KERNEL); 8f3f1c9a22a642 Alex Deucher 2011-11-04 2792 if (rdev->pm.power_state[0].clock_info) { 56278a8edacee9 Alex Deucher 2009-12-28 2793 /* add the default mode */ 0ec0e74f784ca0 Alex Deucher 2009-12-23 2794 rdev->pm.power_state[state_index].type = 0ec0e74f784ca0 Alex Deucher 2009-12-23 2795 POWER_STATE_TYPE_DEFAULT; 56278a8edacee9 Alex Deucher 2009-12-28 2796 rdev->pm.power_state[state_index].num_clock_modes = 1; 56278a8edacee9 Alex Deucher 2009-12-28 2797 rdev->pm.power_state[state_index].clock_info[0].mclk = rdev->clock.default_mclk; 56278a8edacee9 Alex Deucher 2009-12-28 2798 rdev->pm.power_state[state_index].clock_info[0].sclk = rdev->clock.default_sclk; 56278a8edacee9 Alex Deucher 2009-12-28 2799 rdev->pm.power_state[state_index].default_clock_mode = 56278a8edacee9 Alex Deucher 2009-12-28 2800 &rdev->pm.power_state[state_index].clock_info[0]; 56278a8edacee9 Alex Deucher 2009-12-28 2801 rdev->pm.power_state[state_index].clock_info[0].voltage.type = VOLTAGE_NONE; 79daedc942813c Alex Deucher 2010-04-22 2802 rdev->pm.power_state[state_index].pcie_lanes = 16; a48b9b4edb8bb8 Alex Deucher 2010-04-22 2803 rdev->pm.default_power_state_index = state_index; a48b9b4edb8bb8 Alex Deucher 2010-04-22 2804 rdev->pm.power_state[state_index].flags = 0; 56278a8edacee9 Alex Deucher 2009-12-28 2805 state_index++; 56278a8edacee9 Alex Deucher 2009-12-28 2806 } 0975b16274bad1 Alex Deucher 2011-02-02 2807 } 8f3f1c9a22a642 Alex Deucher 2011-11-04 2808 } 02b17cc05372ab Alex Deucher 2010-04-22 2809 56278a8edacee9 Alex Deucher 2009-12-28 2810 rdev->pm.num_power_states = state_index; 771fe6b912fca5 Jerome Glisse 2009-06-05 2811 a48b9b4edb8bb8 Alex Deucher 2010-04-22 2812 rdev->pm.current_power_state_index = rdev->pm.default_power_state_index; a48b9b4edb8bb8 Alex Deucher 2010-04-22 2813 rdev->pm.current_clock_mode_index = 0; 4376eee92e5a83 Alexander Müller 2011-12-30 2814 if (rdev->pm.default_power_state_index >= 0) 4376eee92e5a83 Alexander Müller 2011-12-30 2815 rdev->pm.current_vddc = 4376eee92e5a83 Alexander Müller 2011-12-30 @2816 rdev->pm.power_state[rdev->pm.default_power_state_index].clock_info[0].voltage.voltage; 4376eee92e5a83 Alexander Müller 2011-12-30 2817 else 4376eee92e5a83 Alexander Müller 2011-12-30 2818 rdev->pm.current_vddc = 0; 56278a8edacee9 Alex Deucher 2009-12-28 2819 } 56278a8edacee9 Alex Deucher 2009-12-28 2820 :::::: The code at line 2816 was first introduced by commit :::::: 4376eee92e5a8332b470040e672ea99cd44c826a drm/radeon/kms/atom: fix possible segfault in pm setup :::::: TO: Alexander Müller <serveralex(a)gmail.com&gt; :::::: CC: Dave Airlie <airlied(a)redhat.com&gt; -- 0-DAY CI Kernel Test Service https://01.org/lkp