diff options
Diffstat (limited to 'mm/memory-failure.c')
| -rw-r--r-- | mm/memory-failure.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index edeaf2319e74..82ac73436d0e 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -48,6 +48,50 @@ int sysctl_memory_failure_recovery __read_mostly = 1; atomic_long_t mce_bad_pages __read_mostly = ATOMIC_LONG_INIT(0); +u32 hwpoison_filter_dev_major = ~0U; +u32 hwpoison_filter_dev_minor = ~0U; +EXPORT_SYMBOL_GPL(hwpoison_filter_dev_major); +EXPORT_SYMBOL_GPL(hwpoison_filter_dev_minor); + +static int hwpoison_filter_dev(struct page *p) +{ + struct address_space *mapping; + dev_t dev; + + if (hwpoison_filter_dev_major == ~0U && + hwpoison_filter_dev_minor == ~0U) + return 0; + + /* + * page_mapping() does not accept slab page + */ + if (PageSlab(p)) + return -EINVAL; + + mapping = page_mapping(p); + if (mapping == NULL || mapping->host == NULL) + return -EINVAL; + + dev = mapping->host->i_sb->s_dev; + if (hwpoison_filter_dev_major != ~0U && + hwpoison_filter_dev_major != MAJOR(dev)) + return -EINVAL; + if (hwpoison_filter_dev_minor != ~0U && + hwpoison_filter_dev_minor != MINOR(dev)) + return -EINVAL; + + return 0; +} + +int hwpoison_filter(struct page *p) +{ + if (hwpoison_filter_dev(p)) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(hwpoison_filter); + /* * Send all the processes who have the page mapped an ``action optional'' * signal. @@ -843,6 +887,13 @@ int __memory_failure(unsigned long pfn, int trapno, int flags) res = 0; goto out; } + if (hwpoison_filter(p)) { + if (TestClearPageHWPoison(p)) + atomic_long_dec(&mce_bad_pages); + unlock_page(p); + put_page(p); + return 0; + } wait_on_page_writeback(p); |