diff options
Diffstat (limited to 'mm/memory-failure.c')
| -rw-r--r-- | mm/memory-failure.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index fa25a022e64d..70b2ccf0d51e 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -879,12 +879,17 @@ static int kill_accessing_process(struct task_struct *p, unsigned long pfn, mmap_read_lock(p->mm); ret = walk_page_range(p->mm, 0, TASK_SIZE, &hwpoison_walk_ops, (void *)&priv); + /* + * ret = 1 when CMCI wins, regardless of whether try_to_unmap() + * succeeds or fails, then kill the process with SIGBUS. + * ret = 0 when poison page is a clean page and it's dropped, no + * SIGBUS is needed. + */ if (ret == 1 && priv.tk.addr) kill_proc(&priv.tk, pfn, flags); - else - ret = 0; mmap_read_unlock(p->mm); - return ret > 0 ? -EHWPOISON : -EFAULT; + + return ret > 0 ? -EHWPOISON : 0; } /* @@ -1554,6 +1559,10 @@ static int get_hwpoison_page(struct page *p, unsigned long flags) return ret; } +/* + * The caller must guarantee the folio isn't large folio, except hugetlb. + * try_to_unmap() can't handle it. + */ int unmap_poisoned_folio(struct folio *folio, unsigned long pfn, bool must_kill) { enum ttu_flags ttu = TTU_IGNORE_MLOCK | TTU_SYNC | TTU_HWPOISON; |