Hi Christophe, I love your patch! Perhaps something to improve:
[auto build test WARNING on powerpc/next] [also build test WARNING on v5.8 next-20200806] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Christophe-Leroy/powerpc-mm-sanity_check_fault-should-work-for-all-not-only-BOOK3S/20200807-012433 base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <l...@intel.com> All warnings (new ones prefixed by >>): >> arch/powerpc/mm/fault.c:567:6: warning: no previous prototype for >> '__bad_page_fault' [-Wmissing-prototypes] 567 | void __bad_page_fault(struct pt_regs *regs, unsigned long address, int sig) | ^~~~~~~~~~~~~~~~ vim +/__bad_page_fault +567 arch/powerpc/mm/fault.c 561 562 /* 563 * bad_page_fault is called when we have a bad access from the kernel. 564 * It is called from the DSI and ISI handlers in head.S and from some 565 * of the procedures in traps.c. 566 */ > 567 void __bad_page_fault(struct pt_regs *regs, unsigned long address, int > sig) 568 { 569 int is_write = page_fault_is_write(regs->dsisr); 570 571 /* kernel has accessed a bad area */ 572 573 switch (TRAP(regs)) { 574 case 0x300: 575 case 0x380: 576 case 0xe00: 577 pr_alert("BUG: %s on %s at 0x%08lx\n", 578 regs->dar < PAGE_SIZE ? "Kernel NULL pointer dereference" : 579 "Unable to handle kernel data access", 580 is_write ? "write" : "read", regs->dar); 581 break; 582 case 0x400: 583 case 0x480: 584 pr_alert("BUG: Unable to handle kernel instruction fetch%s", 585 regs->nip < PAGE_SIZE ? " (NULL pointer?)\n" : "\n"); 586 break; 587 case 0x600: 588 pr_alert("BUG: Unable to handle kernel unaligned access at 0x%08lx\n", 589 regs->dar); 590 break; 591 default: 592 pr_alert("BUG: Unable to handle unknown paging fault at 0x%08lx\n", 593 regs->dar); 594 break; 595 } 596 printk(KERN_ALERT "Faulting instruction address: 0x%08lx\n", 597 regs->nip); 598 599 if (task_stack_end_corrupted(current)) 600 printk(KERN_ALERT "Thread overran stack, or stack corrupted\n"); 601 602 die("Kernel access of bad area", regs, sig); 603 } 604 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
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