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d="scan'208";a="7163562" Received: from lkp-server01.sh.intel.com (HELO 0caa9d2d175c) ([10.239.97.150]) by fmviesa013.fm.intel.com with ESMTP; 29 Oct 2026 23:02:28 -0700 Received: from kbuild by 0caa9d2d175c with local (Exim 4.98.2) (envelope-from ) id 1xMfh3-00000000bMu-1T2C; Fri, 30 Oct 2026 06:02:25 +0000 Date: Fri, 30 Oct 2026 14:01:31 +0800 From: kernel test robot To: cros-kernel-buildreports@googlegroups.com Cc: oe-kbuild-all@lists.linux.dev Subject: [android-common:android16-6.12-p3s 2/2] arch/arm64/kvm/hyp/nvhe/ftrace.c:91:15: warning: no previous prototype for function '__hyp_ftrace_trace' Message-ID: <202610301323.FilmGRSw-lkp@intel.com> User-Agent: s-nail v14.9.25 X-Mailing-List: oe-kbuild-all@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list Hi Vincent, First bad commit (maybe != root cause): tree: https://android.googlesource.com/kernel/common android16-6.12-p3s head: fd6fb6e5a1163b81047df5e1876919a55e9a4d22 commit: 58ca789e21bb4fc0af3eaeacd88252a5564a816b [2/2] ANDROID: KVM: arm64: PROTECTED_NVHE_FTRACE to PKVM_FTRACE config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20261030/202610301323.FilmGRSw-lkp@intel.com/config) compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project c2ea4440d4b64c148de4fdfca1fc2c437a0701e4) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261030/202610301323.FilmGRSw-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/202610301323.FilmGRSw-lkp@intel.com/ Note: functions only called from assembly code should be annotated with the asmlinkage attribute All warnings (new ones prefixed by >>): >> arch/arm64/kvm/hyp/nvhe/ftrace.c:91:15: warning: no previous prototype for function '__hyp_ftrace_trace' [-Wmissing-prototypes] 91 | unsigned long __hyp_ftrace_trace(unsigned long ip, unsigned long parent, | ^ arch/arm64/kvm/hyp/nvhe/ftrace.c:91:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 91 | unsigned long __hyp_ftrace_trace(unsigned long ip, unsigned long parent, | ^ | static >> arch/arm64/kvm/hyp/nvhe/ftrace.c:109:15: warning: no previous prototype for function '__hyp_ftrace_ret_trace' [-Wmissing-prototypes] 109 | unsigned long __hyp_ftrace_ret_trace(void) | ^ arch/arm64/kvm/hyp/nvhe/ftrace.c:109:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 109 | unsigned long __hyp_ftrace_ret_trace(void) | ^ | static >> arch/arm64/kvm/hyp/nvhe/ftrace.c:252:13: warning: no previous prototype for function '__get_phys' [-Wmissing-prototypes] 252 | phys_addr_t __get_phys(unsigned long addr) | ^ arch/arm64/kvm/hyp/nvhe/ftrace.c:252:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 252 | phys_addr_t __get_phys(unsigned long addr) | ^ | static 3 warnings generated. Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for INTEL_MEI_ME Depends on [n]: X86 && PCI [=y] Selected by [m]: - INTEL_MEI_HDCP [=m] && (DRM_I915 [=n] || DRM_XE [=m]) - INTEL_MEI_PXP [=m] && (DRM_I915 [=n] || DRM_XE [=m]) vim +/__hyp_ftrace_trace +91 arch/arm64/kvm/hyp/nvhe/ftrace.c e5a5778f97569e Vincent Donnefort 2024-10-01 90 e5a5778f97569e Vincent Donnefort 2024-10-01 @91 unsigned long __hyp_ftrace_trace(unsigned long ip, unsigned long parent, e5a5778f97569e Vincent Donnefort 2024-10-01 92 unsigned long offset_idx) e5a5778f97569e Vincent Donnefort 2024-10-01 93 { e5a5778f97569e Vincent Donnefort 2024-10-01 94 unsigned long func = __kern_addr(offset_idx, ip); e5a5778f97569e Vincent Donnefort 2024-10-01 95 unsigned long parent_offset_idx; e5a5778f97569e Vincent Donnefort 2024-10-01 96 e5a5778f97569e Vincent Donnefort 2024-10-01 97 /* When modules are called from core */ e5a5778f97569e Vincent Donnefort 2024-10-01 98 parent_offset_idx = parent > (unsigned long)__hyp_text_start ? 0 : offset_idx; e5a5778f97569e Vincent Donnefort 2024-10-01 99 600ba9bc4d4627 Vincent Donnefort 2024-10-01 100 trace_func(func, __kern_addr(parent_offset_idx, parent)); 600ba9bc4d4627 Vincent Donnefort 2024-10-01 101 e5a5778f97569e Vincent Donnefort 2024-10-01 102 /* Only install the trampoline if we can revert to the original parent */ e5a5778f97569e Vincent Donnefort 2024-10-01 103 if (hyp_ftrace_func_push(func, parent)) e5a5778f97569e Vincent Donnefort 2024-10-01 104 return (unsigned long)__hyp_ftrace_ret_tramp; e5a5778f97569e Vincent Donnefort 2024-10-01 105 e5a5778f97569e Vincent Donnefort 2024-10-01 106 return parent; e5a5778f97569e Vincent Donnefort 2024-10-01 107 } e5a5778f97569e Vincent Donnefort 2024-10-01 108 e5a5778f97569e Vincent Donnefort 2024-10-01 @109 unsigned long __hyp_ftrace_ret_trace(void) e5a5778f97569e Vincent Donnefort 2024-10-01 110 { e5a5778f97569e Vincent Donnefort 2024-10-01 111 struct hyp_ftrace_stack_frame *frame = hyp_ftrace_func_pop(); e5a5778f97569e Vincent Donnefort 2024-10-01 112 e5a5778f97569e Vincent Donnefort 2024-10-01 113 BUG_ON(!frame); 600ba9bc4d4627 Vincent Donnefort 2024-10-01 114 trace_func_ret(frame->func); e5a5778f97569e Vincent Donnefort 2024-10-01 115 e5a5778f97569e Vincent Donnefort 2024-10-01 116 return frame->ret; e5a5778f97569e Vincent Donnefort 2024-10-01 117 } e5a5778f97569e Vincent Donnefort 2024-10-01 118 e5a5778f97569e Vincent Donnefort 2024-10-01 119 void hyp_ftrace_ret_flush(void) e5a5778f97569e Vincent Donnefort 2024-10-01 120 { e5a5778f97569e Vincent Donnefort 2024-10-01 121 struct hyp_ftrace_stack_frame *frame = hyp_ftrace_func_pop(); e5a5778f97569e Vincent Donnefort 2024-10-01 122 600ba9bc4d4627 Vincent Donnefort 2024-10-01 123 while (frame) { 600ba9bc4d4627 Vincent Donnefort 2024-10-01 124 trace_func_ret(frame->func); e5a5778f97569e Vincent Donnefort 2024-10-01 125 frame = hyp_ftrace_func_pop(); e5a5778f97569e Vincent Donnefort 2024-10-01 126 } 600ba9bc4d4627 Vincent Donnefort 2024-10-01 127 } e5a5778f97569e Vincent Donnefort 2024-10-01 128 e5a5778f97569e Vincent Donnefort 2024-10-01 129 static int __get_offset_idx_ins(unsigned long *func, unsigned long ip, u32 *insn, e5a5778f97569e Vincent Donnefort 2024-10-01 130 void *args) e5a5778f97569e Vincent Donnefort 2024-10-01 131 { e5a5778f97569e Vincent Donnefort 2024-10-01 132 unsigned long idx = (unsigned long)args; e5a5778f97569e Vincent Donnefort 2024-10-01 133 u32 imm, mask = (BIT(16) - 1) << 5; e5a5778f97569e Vincent Donnefort 2024-10-01 134 e5a5778f97569e Vincent Donnefort 2024-10-01 135 imm = (idx << 5) & mask; e5a5778f97569e Vincent Donnefort 2024-10-01 136 e5a5778f97569e Vincent Donnefort 2024-10-01 137 *insn = aarch64_insn_get_movz_value(); e5a5778f97569e Vincent Donnefort 2024-10-01 138 *insn |= BIT(31); /* 64-bits variant */ e5a5778f97569e Vincent Donnefort 2024-10-01 139 *insn |= 10; /* x10 */ e5a5778f97569e Vincent Donnefort 2024-10-01 140 *insn &= ~mask; e5a5778f97569e Vincent Donnefort 2024-10-01 141 *insn |= imm; e5a5778f97569e Vincent Donnefort 2024-10-01 142 *insn = cpu_to_le32(*insn); e5a5778f97569e Vincent Donnefort 2024-10-01 143 e5a5778f97569e Vincent Donnefort 2024-10-01 144 return 0; e5a5778f97569e Vincent Donnefort 2024-10-01 145 } e5a5778f97569e Vincent Donnefort 2024-10-01 146 e630ddc2c3e915 Vincent Donnefort 2024-10-01 147 static int __get_disable_ins(unsigned long *func, unsigned long ip, u32 *insn, e630ddc2c3e915 Vincent Donnefort 2024-10-01 148 void *args) e630ddc2c3e915 Vincent Donnefort 2024-10-01 149 { e630ddc2c3e915 Vincent Donnefort 2024-10-01 150 static u32 nop; e630ddc2c3e915 Vincent Donnefort 2024-10-01 151 e630ddc2c3e915 Vincent Donnefort 2024-10-01 152 if (!nop) e630ddc2c3e915 Vincent Donnefort 2024-10-01 153 nop = aarch64_insn_gen_nop(); e630ddc2c3e915 Vincent Donnefort 2024-10-01 154 e630ddc2c3e915 Vincent Donnefort 2024-10-01 155 *insn = cpu_to_le32(nop); e630ddc2c3e915 Vincent Donnefort 2024-10-01 156 e630ddc2c3e915 Vincent Donnefort 2024-10-01 157 return 0; e630ddc2c3e915 Vincent Donnefort 2024-10-01 158 } e630ddc2c3e915 Vincent Donnefort 2024-10-01 159 e5a5778f97569e Vincent Donnefort 2024-10-01 160 static int __get_enable_ins(unsigned long ip, u32 *insn, void *tramp) e5a5778f97569e Vincent Donnefort 2024-10-01 161 { e5a5778f97569e Vincent Donnefort 2024-10-01 162 u32 imm, mask; e5a5778f97569e Vincent Donnefort 2024-10-01 163 long delta; e5a5778f97569e Vincent Donnefort 2024-10-01 164 e5a5778f97569e Vincent Donnefort 2024-10-01 165 delta = (long)tramp - (long)ip; e5a5778f97569e Vincent Donnefort 2024-10-01 166 e5a5778f97569e Vincent Donnefort 2024-10-01 167 if (delta > SZ_128M || delta <= -SZ_128M) e5a5778f97569e Vincent Donnefort 2024-10-01 168 return -ERANGE; e5a5778f97569e Vincent Donnefort 2024-10-01 169 e5a5778f97569e Vincent Donnefort 2024-10-01 170 mask = BIT(26) - 1; e5a5778f97569e Vincent Donnefort 2024-10-01 171 imm = (delta >> 2) & mask; e5a5778f97569e Vincent Donnefort 2024-10-01 172 e5a5778f97569e Vincent Donnefort 2024-10-01 173 *insn = aarch64_insn_get_bl_value() & ~(mask); e5a5778f97569e Vincent Donnefort 2024-10-01 174 *insn |= imm; e5a5778f97569e Vincent Donnefort 2024-10-01 175 *insn = cpu_to_le32(*insn); e5a5778f97569e Vincent Donnefort 2024-10-01 176 e5a5778f97569e Vincent Donnefort 2024-10-01 177 return 0; e5a5778f97569e Vincent Donnefort 2024-10-01 178 } e5a5778f97569e Vincent Donnefort 2024-10-01 179 e5a5778f97569e Vincent Donnefort 2024-10-01 180 #define funcs_pg_enabled(func) ((func) & 0x1) e5a5778f97569e Vincent Donnefort 2024-10-01 181 #define funcs_pg_func(func) ((func) & ~BIT(0)) e5a5778f97569e Vincent Donnefort 2024-10-01 182 #define funcs_pg_is_end(func) \ e5a5778f97569e Vincent Donnefort 2024-10-01 183 ({ \ e5a5778f97569e Vincent Donnefort 2024-10-01 184 (!(*(func)) || \ e5a5778f97569e Vincent Donnefort 2024-10-01 185 ((PAGE_ALIGN((unsigned long)(func) + 1) - (unsigned long)(func)) <= 8)); \ e5a5778f97569e Vincent Donnefort 2024-10-01 186 }) e5a5778f97569e Vincent Donnefort 2024-10-01 187 e5a5778f97569e Vincent Donnefort 2024-10-01 188 /* e5a5778f97569e Vincent Donnefort 2024-10-01 189 * During init the kernel can notify a function needs to be enabled. This is e5a5778f97569e Vincent Donnefort 2024-10-01 190 * relying on the same encoding as the func_pg. e5a5778f97569e Vincent Donnefort 2024-10-01 191 */ e5a5778f97569e Vincent Donnefort 2024-10-01 192 #define get_func(func) funcs_pg_func(func) e5a5778f97569e Vincent Donnefort 2024-10-01 193 e5a5778f97569e Vincent Donnefort 2024-10-01 194 static int __get_enable_disable_ins_early(unsigned long *func, unsigned long ip, e5a5778f97569e Vincent Donnefort 2024-10-01 195 u32 *insn, void *tramp) e5a5778f97569e Vincent Donnefort 2024-10-01 196 { e5a5778f97569e Vincent Donnefort 2024-10-01 197 if (funcs_pg_enabled(*func)) e5a5778f97569e Vincent Donnefort 2024-10-01 198 return __get_enable_ins(ip, insn, tramp); e5a5778f97569e Vincent Donnefort 2024-10-01 199 e5a5778f97569e Vincent Donnefort 2024-10-01 200 /* Nothing else to do */ e5a5778f97569e Vincent Donnefort 2024-10-01 201 return 1; e5a5778f97569e Vincent Donnefort 2024-10-01 202 } e5a5778f97569e Vincent Donnefort 2024-10-01 203 e630ddc2c3e915 Vincent Donnefort 2024-10-01 204 struct __ftrace_sync_patch_args { e630ddc2c3e915 Vincent Donnefort 2024-10-01 205 void *tramp; e630ddc2c3e915 Vincent Donnefort 2024-10-01 206 unsigned long offset_idx; e630ddc2c3e915 Vincent Donnefort 2024-10-01 207 unsigned long *funcs_pg; e630ddc2c3e915 Vincent Donnefort 2024-10-01 208 }; e630ddc2c3e915 Vincent Donnefort 2024-10-01 209 e630ddc2c3e915 Vincent Donnefort 2024-10-01 210 static int e630ddc2c3e915 Vincent Donnefort 2024-10-01 211 __get_enable_disable_ins_from_funcs_pg(unsigned long *func, unsigned long ip, e630ddc2c3e915 Vincent Donnefort 2024-10-01 212 u32 *insn, void *__args) e630ddc2c3e915 Vincent Donnefort 2024-10-01 213 { e630ddc2c3e915 Vincent Donnefort 2024-10-01 214 struct __ftrace_sync_patch_args *args = __args; e630ddc2c3e915 Vincent Donnefort 2024-10-01 215 unsigned long kern_addr; e630ddc2c3e915 Vincent Donnefort 2024-10-01 216 static u32 nop; e630ddc2c3e915 Vincent Donnefort 2024-10-01 217 u32 cur_insn; e630ddc2c3e915 Vincent Donnefort 2024-10-01 218 bool enable; e630ddc2c3e915 Vincent Donnefort 2024-10-01 219 int ret = 0; e630ddc2c3e915 Vincent Donnefort 2024-10-01 220 e630ddc2c3e915 Vincent Donnefort 2024-10-01 221 if (funcs_pg_is_end(args->funcs_pg)) e630ddc2c3e915 Vincent Donnefort 2024-10-01 222 return -EAGAIN; e630ddc2c3e915 Vincent Donnefort 2024-10-01 223 e630ddc2c3e915 Vincent Donnefort 2024-10-01 224 kern_addr = __kern_addr(args->offset_idx, *func); e630ddc2c3e915 Vincent Donnefort 2024-10-01 225 if (get_func(kern_addr) != funcs_pg_func(*args->funcs_pg)) { e630ddc2c3e915 Vincent Donnefort 2024-10-01 226 ret = -EINVAL; e630ddc2c3e915 Vincent Donnefort 2024-10-01 227 goto end; e630ddc2c3e915 Vincent Donnefort 2024-10-01 228 } e630ddc2c3e915 Vincent Donnefort 2024-10-01 229 e630ddc2c3e915 Vincent Donnefort 2024-10-01 230 if (!nop) e630ddc2c3e915 Vincent Donnefort 2024-10-01 231 nop = aarch64_insn_gen_nop(); e630ddc2c3e915 Vincent Donnefort 2024-10-01 232 e630ddc2c3e915 Vincent Donnefort 2024-10-01 233 enable = funcs_pg_enabled(*args->funcs_pg); e630ddc2c3e915 Vincent Donnefort 2024-10-01 234 cur_insn = *(u32 *)ip; e630ddc2c3e915 Vincent Donnefort 2024-10-01 235 e630ddc2c3e915 Vincent Donnefort 2024-10-01 236 /* Are we modifying anything? */ e630ddc2c3e915 Vincent Donnefort 2024-10-01 237 if ((cur_insn == nop) != enable) { e630ddc2c3e915 Vincent Donnefort 2024-10-01 238 ret = -EBUSY; e630ddc2c3e915 Vincent Donnefort 2024-10-01 239 goto end; e630ddc2c3e915 Vincent Donnefort 2024-10-01 240 } e630ddc2c3e915 Vincent Donnefort 2024-10-01 241 e630ddc2c3e915 Vincent Donnefort 2024-10-01 242 if (funcs_pg_enabled(*args->funcs_pg)) e630ddc2c3e915 Vincent Donnefort 2024-10-01 243 ret = __get_enable_ins(ip, insn, args->tramp); e630ddc2c3e915 Vincent Donnefort 2024-10-01 244 else e630ddc2c3e915 Vincent Donnefort 2024-10-01 245 *insn = cpu_to_le32(nop); e630ddc2c3e915 Vincent Donnefort 2024-10-01 246 e630ddc2c3e915 Vincent Donnefort 2024-10-01 247 end: e630ddc2c3e915 Vincent Donnefort 2024-10-01 248 args->funcs_pg++; e630ddc2c3e915 Vincent Donnefort 2024-10-01 249 return ret; e630ddc2c3e915 Vincent Donnefort 2024-10-01 250 } e630ddc2c3e915 Vincent Donnefort 2024-10-01 251 e5a5778f97569e Vincent Donnefort 2024-10-01 @252 phys_addr_t __get_phys(unsigned long addr) e5a5778f97569e Vincent Donnefort 2024-10-01 253 { e5a5778f97569e Vincent Donnefort 2024-10-01 254 if (addr >= (unsigned long)__hyp_text_start) e5a5778f97569e Vincent Donnefort 2024-10-01 255 return __hyp_pa(addr); e5a5778f97569e Vincent Donnefort 2024-10-01 256 e5a5778f97569e Vincent Donnefort 2024-10-01 257 return __pkvm_private_range_pa((void *)addr); e5a5778f97569e Vincent Donnefort 2024-10-01 258 } e5a5778f97569e Vincent Donnefort 2024-10-01 259 :::::: The code at line 91 was first introduced by commit :::::: e5a5778f97569eaad67f9b89f20e19eb2adf76c9 ANDROID: KVM: arm64: Add Ftrace patching for pKVM hyp :::::: TO: Vincent Donnefort :::::: CC: Vincent Donnefort -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki