HWPOISON: add an interface to switch off/on all the page filters

[linux-2.6-block.git] / mm / memory-failure.c

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 117ef15984696377999f22fba89ed3f452499cc0..2d5f1223bf4d4a4640619104a50772a271fa08b2 100644 (file)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -49,10 +49,12 @@ int sysctl_memory_failure_recovery __read_mostly = 1;
 
 atomic_long_t mce_bad_pages __read_mostly = ATOMIC_LONG_INIT(0);
 
+u32 hwpoison_filter_enable = 0;
 u32 hwpoison_filter_dev_major = ~0U;
 u32 hwpoison_filter_dev_minor = ~0U;
 u64 hwpoison_filter_flags_mask;
 u64 hwpoison_filter_flags_value;
+EXPORT_SYMBOL_GPL(hwpoison_filter_enable);
 EXPORT_SYMBOL_GPL(hwpoison_filter_dev_major);
 EXPORT_SYMBOL_GPL(hwpoison_filter_dev_minor);
 EXPORT_SYMBOL_GPL(hwpoison_filter_flags_mask);
@@ -145,6 +147,9 @@ static int hwpoison_filter_task(struct page *p) { return 0; }
 
 int hwpoison_filter(struct page *p)
 {
+       if (!hwpoison_filter_enable)
+               return 0;
+
        if (hwpoison_filter_dev(p))
                return -EINVAL;