tree: https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/kentry head: b0d7a5e5a9b11a6ddb50b90e31877e3cb1f93362 commit: e2bd5fab359ea464f6268bfaca18c3c0344edf33 [6/10] kentry: Remove enter_from/exit_to_user_mode() config: s390-randconfig-r011-20210321 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 14696baaf4c43fe53f738bc292bbe169eed93d5d) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?id... git remote add luto https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git git fetch --no-tags luto x86/kentry git checkout e2bd5fab359ea464f6268bfaca18c3c0344edf33 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from arch/s390/kernel/traps.c:28: In file included from include/linux/entry-common.h:6: In file included from include/linux/tracehook.h:50: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:26: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x)) ^ include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16' #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) ^ In file included from arch/s390/kernel/traps.c:28: In file included from include/linux/entry-common.h:6: In file included from include/linux/tracehook.h:50: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:26: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32' #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) ^ In file included from arch/s390/kernel/traps.c:28: In file included from include/linux/entry-common.h:6: In file included from include/linux/tracehook.h:50: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:26: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ arch/s390/kernel/traps.c:300:2: error: unknown type name 'irqentry_state_t'; did you mean 'kentry_state_t'? irqentry_state_t state; ^~~~~~~~~~~~~~~~ kentry_state_t include/linux/entry-common.h:315:3: note: 'kentry_state_t' declared here } kentry_state_t; ^ arch/s390/kernel/traps.c:305:10: error: implicit declaration of function 'irqentry_enter' [-Werror,-Wimplicit-function-declaration] state = irqentry_enter(regs); ^ arch/s390/kernel/traps.c:305:10: note: did you mean 'kentry_enter'? include/linux/entry-common.h:349:24: note: 'kentry_enter' declared here kentry_state_t noinstr kentry_enter(struct pt_regs *regs); ^ arch/s390/kernel/traps.c:305:8: error: assigning to 'kentry_state_t' (aka 'struct kentry_state') from incompatible type 'int' state = irqentry_enter(regs); ^ ~~~~~~~~~~~~~~~~~~~~ arch/s390/kernel/traps.c:346:2: error: implicit declaration of function 'irqentry_exit' [-Werror,-Wimplicit-function-declaration] irqentry_exit(regs, state); ^ arch/s390/kernel/traps.c:346:2: note: did you mean 'kentry_exit'? include/linux/entry-common.h:375:14: note: 'kentry_exit' declared here void noinstr kentry_exit(struct pt_regs *regs, kentry_state_t state); ^ enter_from_user_mode(regs); ^ exit_to_user_mode(); ^ arch/s390/kernel/traps.c:353:3: note: did you mean 'arch_exit_to_user_mode'? include/linux/entry-common.h:211:29: note: 'arch_exit_to_user_mode' declared here static __always_inline void arch_exit_to_user_mode(void); ^ arch/s390/include/asm/entry-common.h:53:32: note: expanded from macro 'arch_exit_to_user_mode' #define arch_exit_to_user_mode arch_exit_to_user_mode ^ 12 warnings and 6 errors generated. -- In file included from arch/s390/kernel/syscall.c:34: In file included from include/linux/entry-common.h:6: In file included from include/linux/tracehook.h:50: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:26: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x)) ^ include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16' #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) ^ In file included from arch/s390/kernel/syscall.c:34: In file included from include/linux/entry-common.h:6: In file included from include/linux/tracehook.h:50: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:26: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32' #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) ^ In file included from arch/s390/kernel/syscall.c:34: In file included from include/linux/entry-common.h:6: In file included from include/linux/tracehook.h:50: In file included from include/linux/memcontrol.h:22: In file included from include/linux/writeback.h:14: In file included from include/linux/blk-cgroup.h:23: In file included from include/linux/blkdev.h:26: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ arch/s390/kernel/syscall.c:124:7: error: implicit declaration of function 'syscall_enter_from_user_mode_work' [-Werror,-Wimplicit-function-declaration] nr = syscall_enter_from_user_mode_work(regs, nr); ^ arch/s390/kernel/syscall.c:140:2: error: implicit declaration of function 'syscall_exit_to_user_mode_work' [-Werror,-Wimplicit-function-declaration] syscall_exit_to_user_mode_work(regs); ^ arch/s390/kernel/syscall.c:140:2: note: did you mean 'arch_exit_to_user_mode_work'? include/linux/entry-common.h:169:20: note: 'arch_exit_to_user_mode_work' declared here static inline void arch_exit_to_user_mode_work(struct pt_regs *regs, ^ arch/s390/include/asm/entry-common.h:42:37: note: expanded from macro 'arch_exit_to_user_mode_work' #define arch_exit_to_user_mode_work arch_exit_to_user_mode_work ^ enter_from_user_mode(regs); ^ exit_to_user_mode(); ^ arch/s390/kernel/syscall.c:167:2: note: did you mean 'arch_exit_to_user_mode'? include/linux/entry-common.h:211:29: note: 'arch_exit_to_user_mode' declared here static __always_inline void arch_exit_to_user_mode(void); ^ arch/s390/include/asm/entry-common.h:53:32: note: expanded from macro 'arch_exit_to_user_mode' #define arch_exit_to_user_mode arch_exit_to_user_mode ^ 12 warnings and 4 errors generated. vim +/enter_from_user_mode +349 arch/s390/kernel/traps.c 56e62a73702836 Sven Schnelle 2020-11-21 295 56e62a73702836 Sven Schnelle 2020-11-21 296 void noinstr __do_pgm_check(struct pt_regs *regs) 56e62a73702836 Sven Schnelle 2020-11-21 297 { 56e62a73702836 Sven Schnelle 2020-11-21 298 unsigned long last_break = S390_lowcore.breaking_event_addr; 56e62a73702836 Sven Schnelle 2020-11-21 299 unsigned int trapnr, syscall_redirect = 0; 56e62a73702836 Sven Schnelle 2020-11-21 300 irqentry_state_t state; 56e62a73702836 Sven Schnelle 2020-11-21 301 56e62a73702836 Sven Schnelle 2020-11-21 302 regs->int_code = *(u32 *)&S390_lowcore.pgm_ilc; 56e62a73702836 Sven Schnelle 2020-11-21 303 regs->int_parm_long = S390_lowcore.trans_exc_code; 56e62a73702836 Sven Schnelle 2020-11-21 304 56e62a73702836 Sven Schnelle 2020-11-21 305 state = irqentry_enter(regs); 56e62a73702836 Sven Schnelle 2020-11-21 306 56e62a73702836 Sven Schnelle 2020-11-21 307 if (user_mode(regs)) { 56e62a73702836 Sven Schnelle 2020-11-21 308 update_timer_sys(); 56e62a73702836 Sven Schnelle 2020-11-21 309 if (last_break < 4096) 56e62a73702836 Sven Schnelle 2020-11-21 310 last_break = 1; 56e62a73702836 Sven Schnelle 2020-11-21 311 current->thread.last_break = last_break; 56e62a73702836 Sven Schnelle 2020-11-21 312 regs->args[0] = last_break; 56e62a73702836 Sven Schnelle 2020-11-21 313 } 56e62a73702836 Sven Schnelle 2020-11-21 314 56e62a73702836 Sven Schnelle 2020-11-21 315 if (S390_lowcore.pgm_code & 0x0200) { 56e62a73702836 Sven Schnelle 2020-11-21 316 /* transaction abort */ 56e62a73702836 Sven Schnelle 2020-11-21 317 memcpy(&current->thread.trap_tdb, &S390_lowcore.pgm_tdb, 256); 56e62a73702836 Sven Schnelle 2020-11-21 318 } 56e62a73702836 Sven Schnelle 2020-11-21 319 56e62a73702836 Sven Schnelle 2020-11-21 320 if (S390_lowcore.pgm_code & PGM_INT_CODE_PER) { 56e62a73702836 Sven Schnelle 2020-11-21 321 if (user_mode(regs)) { 56e62a73702836 Sven Schnelle 2020-11-21 322 struct per_event *ev = &current->thread.per_event; 56e62a73702836 Sven Schnelle 2020-11-21 323 56e62a73702836 Sven Schnelle 2020-11-21 324 set_thread_flag(TIF_PER_TRAP); 56e62a73702836 Sven Schnelle 2020-11-21 325 ev->address = S390_lowcore.per_address; 56e62a73702836 Sven Schnelle 2020-11-21 326 ev->cause = *(u16 *)&S390_lowcore.per_code; 56e62a73702836 Sven Schnelle 2020-11-21 327 ev->paid = S390_lowcore.per_access_id; 56e62a73702836 Sven Schnelle 2020-11-21 328 } else { 56e62a73702836 Sven Schnelle 2020-11-21 329 /* PER event in kernel is kprobes */ 56e62a73702836 Sven Schnelle 2020-11-21 330 __arch_local_irq_ssm(regs->psw.mask & ~PSW_MASK_PER); 56e62a73702836 Sven Schnelle 2020-11-21 331 do_per_trap(regs); 56e62a73702836 Sven Schnelle 2020-11-21 332 goto out; 56e62a73702836 Sven Schnelle 2020-11-21 333 } 56e62a73702836 Sven Schnelle 2020-11-21 334 } 56e62a73702836 Sven Schnelle 2020-11-21 335 56e62a73702836 Sven Schnelle 2020-11-21 336 if (!irqs_disabled_flags(regs->psw.mask)) 56e62a73702836 Sven Schnelle 2020-11-21 337 trace_hardirqs_on(); 56e62a73702836 Sven Schnelle 2020-11-21 338 __arch_local_irq_ssm(regs->psw.mask & ~PSW_MASK_PER); 56e62a73702836 Sven Schnelle 2020-11-21 339 56e62a73702836 Sven Schnelle 2020-11-21 340 trapnr = regs->int_code & PGM_INT_CODE_MASK; 56e62a73702836 Sven Schnelle 2020-11-21 341 if (trapnr) 56e62a73702836 Sven Schnelle 2020-11-21 342 pgm_check_table[trapnr](regs); 56e62a73702836 Sven Schnelle 2020-11-21 343 syscall_redirect = user_mode(regs) && test_pt_regs_flag(regs, PIF_SYSCALL); 56e62a73702836 Sven Schnelle 2020-11-21 344 out: 56e62a73702836 Sven Schnelle 2020-11-21 345 local_irq_disable(); 56e62a73702836 Sven Schnelle 2020-11-21 346 irqentry_exit(regs, state); 56e62a73702836 Sven Schnelle 2020-11-21 347 56e62a73702836 Sven Schnelle 2020-11-21 348 if (syscall_redirect) { 56e62a73702836 Sven Schnelle 2020-11-21 @349 enter_from_user_mode(regs); 56e62a73702836 Sven Schnelle 2020-11-21 350 local_irq_enable(); 56e62a73702836 Sven Schnelle 2020-11-21 351 regs->orig_gpr2 = regs->gprs[2]; 56e62a73702836 Sven Schnelle 2020-11-21 352 do_syscall(regs); 56e62a73702836 Sven Schnelle 2020-11-21 @353 exit_to_user_mode(); :::::: The code at line 349 was first introduced by commit :::::: 56e62a73702836017564eaacd5212e4d0fa1c01d s390: convert to generic entry :::::: TO: Sven Schnelle <svens(a)linux.ibm.com&gt; :::::: CC: Vasily Gorbik <gor(a)linux.ibm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org