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Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Steven Rostedt , Andrew Morton , Mark Rutland , Tom Lendacky , Ashish Kalra , James Gowans , Stanislav Kinsburskii , arnd@arndb.de, pbonzini@redhat.com, madvenka@linux.microsoft.com, Anthony Yznaga , Usama Arif , David Woodhouse , Benjamin Herrenschmidt , Rob Herring , Krzysztof Kozlowski Subject: Re: [PATCH v3 13/17] tracing: Recover trace buffers from kexec handover Message-ID: <202401182318.vEGddOt1-lkp@intel.com> References: <20240117144704.602-14-graf@amazon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240117144704.602-14-graf@amazon.com> X-Rspamd-Queue-Id: 69D0B20034 X-Rspam-User: X-Stat-Signature: q1d3pcqw1qtbhe3ryb8bmq7xphcbrsq6 X-Rspamd-Server: rspam01 X-HE-Tag: 1705591050-403878 X-HE-Meta: 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 i3BzyG0p aKUZk7b4n5U1drSADoPfuhCZFyi/RA04CQDLHWXWHAf9J6GGa6ruACfXlwVYSlirRV3bCeBZt3wZAdxHahfyec7BsDirVftQ7cT54nBrH2pbitR2iMUnIEDt9phV/eJVS7Ys7/P/NUit8w3lRJlZJN0I13r4YtwriEGS0QVbHtpYgnVkWaABEVoILGWsaUQFkqEqWf5AKdPGpmpn47H7wJeWCi8xFz+h9G4bL5E2SQNdx0XfKZSI8UtROLB0SGXVhb12zpllx+3nGg2xPe4xS9Wpsw2w7dfX3Rpia+LemhJELYLwUJtdnVWxCD8k4voXFaPZSF7/Pg1v3YdVdAaYbBdmdOEEKvgZy2evWaDqCxdrH9300Vd6LQod6v5kmxrOUVAlQ7fdy9ohfwWQBz1mQvl+KNNDuzkS51vxi1TpUirZm3baODXa2OC3YR+5LwK1N622uQVVIkUu3aB4xzpdwQ+JcEA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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-20240118] [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: i386-randconfig-061-20240118 (https://download.01.org/0day-ci/archive/20240118/202401182318.vEGddOt1-lkp@intel.com/config) compiler: ClangBuiltLinux clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240118/202401182318.vEGddOt1-lkp@intel.com/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 | Closes: https://lore.kernel.org/oe-kbuild-all/202401182318.vEGddOt1-lkp@intel.com/ sparse warnings: (new ones prefixed by >>) kernel/trace/ring_buffer.c:1105:32: sparse: sparse: incorrect type in return expression (different base types) @@ expected restricted __poll_t @@ got int @@ kernel/trace/ring_buffer.c:1105:32: sparse: expected restricted __poll_t kernel/trace/ring_buffer.c:1105:32: sparse: got int kernel/trace/ring_buffer.c:4955:9: sparse: sparse: context imbalance in 'ring_buffer_peek' - different lock contexts for basic block kernel/trace/ring_buffer.c:5041:9: sparse: sparse: context imbalance in 'ring_buffer_consume' - different lock contexts for basic block kernel/trace/ring_buffer.c:5421:17: sparse: sparse: context imbalance in 'ring_buffer_empty' - different lock contexts for basic block kernel/trace/ring_buffer.c:5451:9: sparse: sparse: context imbalance in 'ring_buffer_empty_cpu' - different lock contexts for basic block >> kernel/trace/ring_buffer.c:5937:82: sparse: sparse: non size-preserving integer to pointer cast kernel/trace/ring_buffer.c:5939:84: sparse: sparse: non size-preserving integer to pointer cast vim +5937 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