diff options
Diffstat (limited to 'mm/memory-failure.c')
| -rw-r--r-- | mm/memory-failure.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 620b0b46159..6b44e52caca 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -45,6 +45,7 @@ #include <linux/page-isolation.h> #include <linux/suspend.h> #include <linux/slab.h> +#include <linux/swapops.h> #include "internal.h" int sysctl_memory_failure_early_kill __read_mostly = 0; @@ -1296,3 +1297,35 @@ done: /* keep elevated page count for bad page */ return ret; } + +/* + * The caller must hold current->mm->mmap_sem in read mode. + */ +int is_hwpoison_address(unsigned long addr) +{ + pgd_t *pgdp; + pud_t pud, *pudp; + pmd_t pmd, *pmdp; + pte_t pte, *ptep; + swp_entry_t entry; + + pgdp = pgd_offset(current->mm, addr); + if (!pgd_present(*pgdp)) + return 0; + pudp = pud_offset(pgdp, addr); + pud = *pudp; + if (!pud_present(pud) || pud_large(pud)) + return 0; + pmdp = pmd_offset(pudp, addr); + pmd = *pmdp; + if (!pmd_present(pmd) || pmd_large(pmd)) + return 0; + ptep = pte_offset_map(pmdp, addr); + pte = *ptep; + pte_unmap(ptep); + if (!is_swap_pte(pte)) + return 0; + entry = pte_to_swp_entry(pte); + return is_hwpoison_entry(entry); +} +EXPORT_SYMBOL_GPL(is_hwpoison_address); |