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charset=us-ascii Content-Disposition: inline tree: https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git pmem-on-reserve-mem-fail head: d877ee1b587be39c141df16a6f92efb0e90b30fd commit: 04e1e84239466de5fe5310ddc8899b8b404a5ccc [2/10] ring-buffer: Add buffer meta data for persistent ring buffer config: i386-buildonly-randconfig-002-20250212 (https://download.01.org/0day-ci/archive/20250212/202502120851.VulVvSyg-lkp@intel.com/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250212/202502120851.VulVvSyg-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/202502120851.VulVvSyg-lkp@intel.com/ All warnings (new ones prefixed by >>): kernel/trace/ring_buffer.c: In function 'rb_range_meta_init': >> kernel/trace/ring_buffer.c:1943:34: warning: variable 'bmeta' set but not used [-Wunused-but-set-variable] 1943 | struct ring_buffer_meta *bmeta; | ^~~~~ vim +/bmeta +1943 kernel/trace/ring_buffer.c 1939 1940 static void rb_range_meta_init(struct trace_buffer *buffer, int nr_pages) 1941 { 1942 struct ring_buffer_cpu_meta *meta; > 1943 struct ring_buffer_meta *bmeta; 1944 unsigned long delta; 1945 void *subbuf; 1946 bool valid = false; 1947 int cpu; 1948 int i; 1949 1950 if (rb_meta_init(buffer)) 1951 valid = true; 1952 1953 bmeta = buffer->meta; 1954 1955 for (cpu = 0; cpu < nr_cpu_ids; cpu++) { 1956 void *next_meta; 1957 1958 meta = rb_range_meta(buffer, nr_pages, cpu); 1959 1960 if (valid && rb_cpu_meta_valid(meta, cpu, buffer, nr_pages)) { 1961 /* Make the mappings match the current address */ 1962 subbuf = rb_subbufs_from_meta(meta); 1963 delta = (unsigned long)subbuf - meta->first_buffer; 1964 meta->first_buffer += delta; 1965 meta->head_buffer += delta; 1966 meta->commit_buffer += delta; 1967 buffer->kaslr_addr = meta->kaslr_addr; 1968 continue; 1969 } 1970 1971 if (cpu < nr_cpu_ids - 1) 1972 next_meta = rb_range_meta(buffer, nr_pages, cpu + 1); 1973 else 1974 next_meta = (void *)buffer->range_addr_end; 1975 1976 memset(meta, 0, next_meta - (void *)meta); 1977 1978 meta->nr_subbufs = nr_pages + 1; 1979 meta->subbuf_size = PAGE_SIZE; 1980 1981 subbuf = rb_subbufs_from_meta(meta); 1982 1983 meta->first_buffer = (unsigned long)subbuf; 1984 rb_meta_init_text_addr(meta); 1985 1986 /* 1987 * The buffers[] array holds the order of the sub-buffers 1988 * that are after the meta data. The sub-buffers may 1989 * be swapped out when read and inserted into a different 1990 * location of the ring buffer. Although their addresses 1991 * remain the same, the buffers[] array contains the 1992 * index into the sub-buffers holding their actual order. 1993 */ 1994 for (i = 0; i < meta->nr_subbufs; i++) { 1995 meta->buffers[i] = i; 1996 rb_init_page(subbuf); 1997 subbuf += meta->subbuf_size; 1998 } 1999 } 2000 } 2001 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki