diff options
Diffstat (limited to 'mm/ptdump.c')
| -rw-r--r-- | mm/ptdump.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/ptdump.c b/mm/ptdump.c index b600c7f864b8..217ebb6edc61 100644 --- a/mm/ptdump.c +++ b/mm/ptdump.c @@ -178,11 +178,18 @@ void ptdump_walk_pgd(struct ptdump_state *st, struct mm_struct *mm, pgd_t *pgd) get_online_mems(); mmap_write_lock(mm); + /* To stabilise kernel page tables we must hold the init_mm lock too. */ + if (mm != &init_mm) + mmap_write_lock_nested(&init_mm, SINGLE_DEPTH_NESTING); + while (range->start != range->end) { walk_page_range_debug(mm, range->start, range->end, &ptdump_ops, pgd, st); range++; } + + if (mm != &init_mm) + mmap_write_unlock(&init_mm); mmap_write_unlock(mm); put_online_mems(); |