Hi Dmitry, [auto build test WARNING on v4.6-rc4] [also build test WARNING on next-20160418] [cannot apply to tip/x86/core tip/x86/vdso] [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-rename-is_-ia32-x32-_task-to-in_-ia32-x32-_syscall/20160418-214656 config: x86_64-randconfig-x000-201616 (attached as .config) reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): In file included from include/asm-generic/bug.h:4:0, from arch/x86/include/asm/bug.h:35, from include/linux/bug.h:4, from include/linux/mmdebug.h:4, from include/linux/mm.h:8, from arch/x86/entry/vdso/vma.c:7: arch/x86/entry/vdso/vma.c: In function 'vdso_mremap': arch/x86/entry/vdso/vma.c:114:37: error: 'vdso_image_32' undeclared (first use in this function) if (in_ia32_syscall() && image == &vdso_image_32) { ^ include/linux/compiler.h:151:30: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^ >> arch/x86/entry/vdso/vma.c:114:2: note: in expansion of macro 'if' if (in_ia32_syscall() && image == &vdso_image_32) { ^ arch/x86/entry/vdso/vma.c:114:37: note: each undeclared identifier is reported only once for each function it appears in if (in_ia32_syscall() && image == &vdso_image_32) { ^ include/linux/compiler.h:151:30: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^ >> arch/x86/entry/vdso/vma.c:114:2: note: in expansion of macro 'if' if (in_ia32_syscall() && image == &vdso_image_32) { ^ vim +/if +114 arch/x86/entry/vdso/vma.c 1 /* 2 * Copyright 2007 Andi Kleen, SUSE Labs. 3 * Subject to the GPL, v.2 4 * 5 * This contains most of the x86 vDSO kernel-side code. 6 */ > 7 #include <linux/mm.h> 8 #include <linux/err.h> 9 #include <linux/sched.h> 10 #include <linux/slab.h> 11 #include <linux/init.h> 12 #include <linux/random.h> 13 #include <linux/elf.h> 14 #include <linux/cpu.h> 15 #include <linux/ptrace.h> 16 #include <asm/pvclock.h> 17 #include <asm/vgtod.h> 18 #include <asm/proto.h> 19 #include <asm/vdso.h> 20 #include <asm/vvar.h> 21 #include <asm/page.h> 22 #include <asm/hpet.h> 23 #include <asm/desc.h> 24 #include <asm/cpufeature.h> 25 26 #if defined(CONFIG_X86_64) 27 unsigned int __read_mostly vdso64_enabled = 1; 28 #endif 29 30 void __init init_vdso_image(const struct vdso_image *image) 31 { 32 BUG_ON(image->size % PAGE_SIZE != 0); 33 34 apply_alternatives((struct alt_instr *)(image->data + image->alt), 35 (struct alt_instr *)(image->data + image->alt + 36 image->alt_len)); 37 } 38 39 struct linux_binprm; 40 41 /* 42 * Put the vdso above the (randomized) stack with another randomized 43 * offset. This way there is no hole in the middle of address space. 44 * To save memory make sure it is still in the same PTE as the stack 45 * top. This doesn't give that many random bits. 46 * 47 * Note that this algorithm is imperfect: the distribution of the vdso 48 * start address within a PMD is biased toward the end. 49 * 50 * Only used for the 64-bit and x32 vdsos. 51 */ 52 static unsigned long vdso_addr(unsigned long start, unsigned len) 53 { 54 #ifdef CONFIG_X86_32 55 return 0; 56 #else 57 unsigned long addr, end; 58 unsigned offset; 59 60 /* 61 * Round up the start address. It can start out unaligned as a result 62 * of stack start randomization. 63 */ 64 start = PAGE_ALIGN(start); 65 66 /* Round the lowest possible end address up to a PMD boundary. */ 67 end = (start + len + PMD_SIZE - 1) & PMD_MASK; 68 if (end >= TASK_SIZE_MAX) 69 end = TASK_SIZE_MAX; 70 end -= len; 71 72 if (end > start) { 73 offset = get_random_int() % (((end - start) >> PAGE_SHIFT) + 1); 74 addr = start + (offset << PAGE_SHIFT); 75 } else { 76 addr = start; 77 } 78 79 /* 80 * Forcibly align the final address in case we have a hardware 81 * issue that requires alignment for performance reasons. 82 */ 83 addr = align_vdso_addr(addr); 84 85 return addr; 86 #endif 87 } 88 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 unsigned long new_size = new_vma->vm_end - new_vma->vm_start; 106 const struct vdso_image *image = current->mm->context.vdso_image; 107 108 if (image->size != new_size) 109 return -EINVAL; 110 111 if (current->mm != new_vma->vm_mm) 112 return -EFAULT; 113 > 114 if (in_ia32_syscall() && image == &vdso_image_32) { 115 struct pt_regs *regs = current_pt_regs(); 116 unsigned long vdso_land = image->sym_int80_landing_pad; 117 unsigned long old_land_addr = vdso_land + --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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