Hi Alexander, kernel test robot noticed the following build warnings: [auto build test WARNING on linus/master] [cannot apply to tip/x86/core arm64/for-next/core akpm-mm/mm-everything v6.7 next-20240117] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Alexander-Graf/mm-memblock-Add-support-for-scratch-memory/20240117-225136 base: linus/master patch link: https://lore.kernel.org/r/20240117144704.602-14-graf%40amazon.com patch subject: [PATCH v3 13/17] tracing: Recover trace buffers from kexec handover config: arc-defconfig (https://download.01.org/0day-ci/archive/20240118/202401181457.dzB2femp-lkp@xxxxxxxxx/config) compiler: arc-elf-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240118/202401181457.dzB2femp-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202401181457.dzB2femp-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): kernel/trace/ring_buffer.c: In function 'rb_kho_replace_buffers': >> kernel/trace/ring_buffer.c:5936:66: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] 5936 | cpu_buffer->head_page->list.prev->next = (struct list_head *) | ^ kernel/trace/ring_buffer.c:5939:44: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] 5939 | bpage->list.next = (struct list_head *)((ulong)new_lhead | rb_page_head); | ^ -- >> kernel/trace/ring_buffer.c:1783: warning: Function parameter or struct member 'tr_off' not described in '__ring_buffer_alloc' vim +5936 kernel/trace/ring_buffer.c 5896 5897 static int rb_kho_replace_buffers(struct ring_buffer_per_cpu *cpu_buffer, 5898 struct rb_kho_cpu *kho) 5899 { 5900 bool first_loop = true; 5901 struct list_head *tmp; 5902 int err = 0; 5903 int i = 0; 5904 5905 if (!IS_ENABLED(CONFIG_FTRACE_KHO)) 5906 return -EINVAL; 5907 5908 if (kho->nr_mems != cpu_buffer->nr_pages * 2) 5909 return -EINVAL; 5910 5911 for (tmp = rb_list_head(cpu_buffer->pages); 5912 tmp != rb_list_head(cpu_buffer->pages) || first_loop; 5913 tmp = rb_list_head(tmp->next), first_loop = false) { 5914 struct buffer_page *bpage = (struct buffer_page *)tmp; 5915 const struct kho_mem *mem_bpage = &kho->mem[i++]; 5916 const struct kho_mem *mem_page = &kho->mem[i++]; 5917 const uint64_t rb_page_head = 1; 5918 struct buffer_page *old_bpage; 5919 void *old_page; 5920 5921 old_bpage = __va(mem_bpage->addr); 5922 if (!bpage) 5923 goto out; 5924 5925 if ((ulong)old_bpage->list.next & rb_page_head) { 5926 struct list_head *new_lhead; 5927 struct buffer_page *new_head; 5928 5929 new_lhead = rb_list_head(bpage->list.next); 5930 new_head = (struct buffer_page *)new_lhead; 5931 5932 /* Assume the buffer is completely full */ 5933 cpu_buffer->tail_page = bpage; 5934 cpu_buffer->commit_page = bpage; 5935 /* Set the head pointers to what they were before */ > 5936 cpu_buffer->head_page->list.prev->next = (struct list_head *) 5937 ((ulong)cpu_buffer->head_page->list.prev->next & ~rb_page_head); 5938 cpu_buffer->head_page = new_head; 5939 bpage->list.next = (struct list_head *)((ulong)new_lhead | rb_page_head); 5940 } 5941 5942 if (rb_page_entries(old_bpage) || rb_page_write(old_bpage)) { 5943 /* 5944 * We want to recycle the pre-kho page, it contains 5945 * trace data. To do so, we unreserve it and swap the 5946 * current data page with the pre-kho one 5947 */ 5948 old_page = kho_claim_mem(mem_page); 5949 5950 /* Recycle the old page, it contains data */ 5951 free_page((ulong)bpage->page); 5952 bpage->page = old_page; 5953 5954 bpage->write = old_bpage->write; 5955 bpage->entries = old_bpage->entries; 5956 bpage->real_end = old_bpage->real_end; 5957 5958 local_inc(&cpu_buffer->pages_touched); 5959 } else { 5960 kho_return_mem(mem_page); 5961 } 5962 5963 kho_return_mem(mem_bpage); 5964 } 5965 5966 out: 5967 return err; 5968 } 5969 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
