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SubjectRe: [PATCH 3/3] mm/mmu_notifier: contextual information for event triggering invalidation
Should be all fixed in v2 i built with and without mmu notifier and
did not had any issue in v2.

On Fri, Dec 07, 2018 at 05:19:21AM +0800, kbuild test robot wrote:
> Hi Jérôme,
>
> I love your patch! Yet something to improve:
>
> [auto build test ERROR on linus/master]
> [also build test ERROR on v4.20-rc5]
> [cannot apply to next-20181206]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url: https://github.com/0day-ci/linux/commits/jglisse-redhat-com/mmu-notifier-contextual-informations/20181207-031930
> config: x86_64-randconfig-x017-201848 (attached as .config)
> compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
> reproduce:
> # save the attached .config to linux build tree
> make ARCH=x86_64
>
> All errors (new ones prefixed by >>):
>
> fs///proc/task_mmu.c: In function 'clear_refs_write':
> fs///proc/task_mmu.c:1099:29: error: storage size of 'range' isn't known
> struct mmu_notifier_range range;
> ^~~~~
> >> fs///proc/task_mmu.c:1147:18: error: 'MMU_NOTIFY_SOFT_DIRTY' undeclared (first use in this function); did you mean 'CLEAR_REFS_SOFT_DIRTY'?
> range.event = MMU_NOTIFY_SOFT_DIRTY;
> ^~~~~~~~~~~~~~~~~~~~~
> CLEAR_REFS_SOFT_DIRTY
> fs///proc/task_mmu.c:1147:18: note: each undeclared identifier is reported only once for each function it appears in
> fs///proc/task_mmu.c:1099:29: warning: unused variable 'range' [-Wunused-variable]
> struct mmu_notifier_range range;
> ^~~~~
>
> vim +1147 fs///proc/task_mmu.c
>
> 1069
> 1070 static ssize_t clear_refs_write(struct file *file, const char __user *buf,
> 1071 size_t count, loff_t *ppos)
> 1072 {
> 1073 struct task_struct *task;
> 1074 char buffer[PROC_NUMBUF];
> 1075 struct mm_struct *mm;
> 1076 struct vm_area_struct *vma;
> 1077 enum clear_refs_types type;
> 1078 struct mmu_gather tlb;
> 1079 int itype;
> 1080 int rv;
> 1081
> 1082 memset(buffer, 0, sizeof(buffer));
> 1083 if (count > sizeof(buffer) - 1)
> 1084 count = sizeof(buffer) - 1;
> 1085 if (copy_from_user(buffer, buf, count))
> 1086 return -EFAULT;
> 1087 rv = kstrtoint(strstrip(buffer), 10, &itype);
> 1088 if (rv < 0)
> 1089 return rv;
> 1090 type = (enum clear_refs_types)itype;
> 1091 if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST)
> 1092 return -EINVAL;
> 1093
> 1094 task = get_proc_task(file_inode(file));
> 1095 if (!task)
> 1096 return -ESRCH;
> 1097 mm = get_task_mm(task);
> 1098 if (mm) {
> > 1099 struct mmu_notifier_range range;
> 1100 struct clear_refs_private cp = {
> 1101 .type = type,
> 1102 };
> 1103 struct mm_walk clear_refs_walk = {
> 1104 .pmd_entry = clear_refs_pte_range,
> 1105 .test_walk = clear_refs_test_walk,
> 1106 .mm = mm,
> 1107 .private = &cp,
> 1108 };
> 1109
> 1110 if (type == CLEAR_REFS_MM_HIWATER_RSS) {
> 1111 if (down_write_killable(&mm->mmap_sem)) {
> 1112 count = -EINTR;
> 1113 goto out_mm;
> 1114 }
> 1115
> 1116 /*
> 1117 * Writing 5 to /proc/pid/clear_refs resets the peak
> 1118 * resident set size to this mm's current rss value.
> 1119 */
> 1120 reset_mm_hiwater_rss(mm);
> 1121 up_write(&mm->mmap_sem);
> 1122 goto out_mm;
> 1123 }
> 1124
> 1125 down_read(&mm->mmap_sem);
> 1126 tlb_gather_mmu(&tlb, mm, 0, -1);
> 1127 if (type == CLEAR_REFS_SOFT_DIRTY) {
> 1128 for (vma = mm->mmap; vma; vma = vma->vm_next) {
> 1129 if (!(vma->vm_flags & VM_SOFTDIRTY))
> 1130 continue;
> 1131 up_read(&mm->mmap_sem);
> 1132 if (down_write_killable(&mm->mmap_sem)) {
> 1133 count = -EINTR;
> 1134 goto out_mm;
> 1135 }
> 1136 for (vma = mm->mmap; vma; vma = vma->vm_next) {
> 1137 vma->vm_flags &= ~VM_SOFTDIRTY;
> 1138 vma_set_page_prot(vma);
> 1139 }
> 1140 downgrade_write(&mm->mmap_sem);
> 1141 break;
> 1142 }
> 1143
> 1144 range.start = 0;
> 1145 range.end = -1UL;
> 1146 range.mm = mm;
> > 1147 range.event = MMU_NOTIFY_SOFT_DIRTY;
> 1148 mmu_notifier_invalidate_range_start(&range);
> 1149 }
> 1150 walk_page_range(0, mm->highest_vm_end, &clear_refs_walk);
> 1151 if (type == CLEAR_REFS_SOFT_DIRTY)
> 1152 mmu_notifier_invalidate_range_end(&range);
> 1153 tlb_finish_mmu(&tlb, 0, -1);
> 1154 up_read(&mm->mmap_sem);
> 1155 out_mm:
> 1156 mmput(mm);
> 1157 }
> 1158 put_task_struct(task);
> 1159
> 1160 return count;
> 1161 }
> 1162
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation


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