Hi Dmitry, [auto build test WARNING on v4.6-rc3] [also build test WARNING on next-20160411] [cannot apply to tip/x86/vdso luto/next] [if your patch is applied to the wrong git tree, please drop us a note to help improving the system]
url: https://github.com/0day-ci/linux/commits/Dmitry-Safonov/x86-vdso-add-mremap-hook-to-vm_special_mapping/20160411-232653 config: x86_64-randconfig-x000-201615 (attached as .config) reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): arch/x86/entry/vdso/vma.c: In function 'vdso_mremap': >> arch/x86/entry/vdso/vma.c:105:18: warning: unused variable 'regs' >> [-Wunused-variable] struct pt_regs *regs = current_pt_regs(); ^ vim +/regs +105 arch/x86/entry/vdso/vma.c 89 static int vdso_fault(const struct vm_special_mapping *sm, 90 struct vm_area_struct *vma, struct vm_fault *vmf) 91 { 92 const struct vdso_image *image = vma->vm_mm->context.vdso_image; 93 94 if (!image || (vmf->pgoff << PAGE_SHIFT) >= image->size) 95 return VM_FAULT_SIGBUS; 96 97 vmf->page = virt_to_page(image->data + (vmf->pgoff << PAGE_SHIFT)); 98 get_page(vmf->page); 99 return 0; 100 } 101 102 static int vdso_mremap(const struct vm_special_mapping *sm, 103 struct vm_area_struct *new_vma) 104 { > 105 struct pt_regs *regs = current_pt_regs(); 106 107 #if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION) 108 /* Fixing userspace landing - look at do_fast_syscall_32 */ 109 if (regs->ip == (unsigned long)current->mm->context.vdso + 110 vdso_image_32.sym_int80_landing_pad 111 #ifdef CONFIG_IA32_EMULATION 112 && current_thread_info()->status & TS_COMPAT 113 #endif --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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