tree: https://github.com/weiny2/linux-kernel.git tip-pks-v4.8-5.12-rc head: fae3081ca82909d3bbe51a7942ab30f333b41f9d commit: 5ea6a032eb2a6cd0a8000029d03ad4581ed3c276 [9/17] x86/entry: Preserve PKRS MSR across exceptions config: s390-randconfig-r022-20210317 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8ef111222a3dd12a9175f69c3bff598c46e8bdf7) 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://github.com/weiny2/linux-kernel/commit/5ea6a032eb2a6cd0a8000029d03... git remote add weiny2 https://github.com/weiny2/linux-kernel.git git fetch --no-tags weiny2 tip-pks-v4.8-5.12-rc git checkout 5ea6a032eb2a6cd0a8000029d03ad4581ed3c276 # 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 >>): ^ include/uapi/linux/swab.h:20:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ ^ In file included from kernel/entry/common.c:4: 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:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:21:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ ^ In file included from kernel/entry/common.c:4: 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:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:22:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0xff000000UL) >> 24))) ^ In file included from kernel/entry/common.c:4: 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:120:12: note: expanded from macro '__swab32' __fswab32(x)) ^ In file included from kernel/entry/common.c:4: 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); ~~~~~~~~~~ ^ pkrs_save_set_irq(regs, INIT_PKRS_VALUE); ^ kernel/entry/common.c:468:26: error: use of undeclared identifier 'INIT_PKRS_VALUE' pkrs_save_set_irq(regs, INIT_PKRS_VALUE); ^ 20 warnings and 2 errors generated. vim +/INIT_PKRS_VALUE +383 kernel/entry/common.c 319 320 noinstr irqentry_state_t irqentry_enter(struct pt_regs *regs) 321 { 322 irqentry_state_t ret = { 323 .exit_rcu = false, 324 }; 325 326 if (user_mode(regs)) { 327 irqentry_enter_from_user_mode(regs); 328 return ret; 329 } 330 331 /* 332 * If this entry hit the idle task invoke rcu_irq_enter() whether 333 * RCU is watching or not. 334 * 335 * Interrupts can nest when the first interrupt invokes softirq 336 * processing on return which enables interrupts. 337 * 338 * Scheduler ticks in the idle task can mark quiescent state and 339 * terminate a grace period, if and only if the timer interrupt is 340 * not nested into another interrupt. 341 * 342 * Checking for rcu_is_watching() here would prevent the nesting 343 * interrupt to invoke rcu_irq_enter(). If that nested interrupt is 344 * the tick then rcu_flavor_sched_clock_irq() would wrongfully 345 * assume that it is the first interupt and eventually claim 346 * quiescent state and end grace periods prematurely. 347 * 348 * Unconditionally invoke rcu_irq_enter() so RCU state stays 349 * consistent. 350 * 351 * TINY_RCU does not support EQS, so let the compiler eliminate 352 * this part when enabled. 353 */ 354 if (!IS_ENABLED(CONFIG_TINY_RCU) && is_idle_task(current)) { 355 /* 356 * If RCU is not watching then the same careful 357 * sequence vs. lockdep and tracing is required 358 * as in irqentry_enter_from_user_mode(). 359 */ 360 lockdep_hardirqs_off(CALLER_ADDR0); 361 rcu_irq_enter(); 362 instrumentation_begin(); 363 trace_hardirqs_off_finish(); 364 instrumentation_end(); 365 366 ret.exit_rcu = true; 367 goto done; 368 } 369 370 /* 371 * If RCU is watching then RCU only wants to check whether it needs 372 * to restart the tick in NOHZ mode. rcu_irq_enter_check_tick() 373 * already contains a warning when RCU is not watching, so no point 374 * in having another one here. 375 */ 376 lockdep_hardirqs_off(CALLER_ADDR0); 377 instrumentation_begin(); 378 rcu_irq_enter_check_tick(); 379 trace_hardirqs_off_finish(); 380 instrumentation_end(); 381 382 done: 384 return ret; 385 } 386 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org