Hi Menglong, kernel test robot noticed the following build warnings:
[auto build test WARNING on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/Menglong-Dong/add-function-metadata-support/20250226-202312 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/20250226121537.752241-1-dongml2%40chinatelecom.cn patch subject: [PATCH bpf-next v2] add function metadata support config: i386-buildonly-randconfig-002-20250227 (https://download.01.org/0day-ci/archive/20250228/[email protected]/config) compiler: gcc-11 (Debian 11.3.0-12) 11.3.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250228/[email protected]/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 <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All warnings (new ones prefixed by >>): kernel/trace/kfunc_md.c: In function 'kfunc_md_get_next': >> kernel/trace/kfunc_md.c:98:20: warning: cast from pointer to integer of >> different size [-Wpointer-to-int-cast] 98 | free_pages((u64)mds, order); | ^ Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for CALL_PADDING Depends on [n]: CC_HAS_ENTRY_PADDING [=y] && OBJTOOL [=n] Selected by [y]: - FUNCTION_METADATA [=y] vim +98 kernel/trace/kfunc_md.c 47 48 /* Get next usable function metadata. On success, return the usable 49 * kfunc_md and store the index of it to *index. If no usable kfunc_md is 50 * found in kfunc_mds, a larger array will be allocated. 51 */ 52 static struct kfunc_md *kfunc_md_get_next(u32 *index) 53 { 54 struct kfunc_md *new_mds, *mds; 55 u32 i, order; 56 57 mds = rcu_dereference(kfunc_mds); 58 if (mds == NULL) { 59 order = kfunc_md_page_order(); 60 new_mds = (void *)__get_free_pages(GFP_KERNEL, order); 61 if (!new_mds) 62 return NULL; 63 kfunc_md_init(new_mds, 0, kfunc_md_count); 64 /* The first time to initialize kfunc_mds, so it is not 65 * used anywhere yet, and we can update it directly. 66 */ 67 rcu_assign_pointer(kfunc_mds, new_mds); 68 mds = new_mds; 69 } 70 71 if (likely(kfunc_md_used < kfunc_md_count)) { 72 /* maybe we can manage the used function metadata entry 73 * with a bit map ? 74 */ 75 for (i = 0; i < kfunc_md_count; i++) { 76 if (!mds[i].users) { 77 kfunc_md_used++; 78 *index = i; 79 mds[i].users++; 80 return mds + i; 81 } 82 } 83 } 84 85 order = kfunc_md_page_order(); 86 /* no available function metadata, so allocate a bigger function 87 * metadata array. 88 */ 89 new_mds = (void *)__get_free_pages(GFP_KERNEL, order + 1); 90 if (!new_mds) 91 return NULL; 92 93 memcpy(new_mds, mds, kfunc_md_count * sizeof(*new_mds)); 94 kfunc_md_init(new_mds, kfunc_md_count, kfunc_md_count * 2); 95 96 rcu_assign_pointer(kfunc_mds, new_mds); 97 synchronize_rcu(); > 98 free_pages((u64)mds, order); 99 100 mds = new_mds + kfunc_md_count; 101 *index = kfunc_md_count; 102 kfunc_md_count <<= 1; 103 kfunc_md_used++; 104 mds->users++; 105 106 return mds; 107 } 108 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
