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-rw-r--r--mm/madvise.c34
1 files changed, 20 insertions, 14 deletions
diff --git a/mm/madvise.c b/mm/madvise.c
index a09d2d3dfae9..31da09412934 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -605,34 +605,40 @@ static long madvise_remove(struct vm_area_struct *vma,
/*
* Error injection support for memory error handling.
*/
-static int madvise_hwpoison(int bhv, unsigned long start, unsigned long end)
+static int madvise_inject_error(int behavior,
+ unsigned long start, unsigned long end)
{
- struct page *p;
+ struct page *page;
+
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
+
for (; start < end; start += PAGE_SIZE <<
- compound_order(compound_head(p))) {
+ compound_order(compound_head(page))) {
int ret;
- ret = get_user_pages_fast(start, 1, 0, &p);
+ ret = get_user_pages_fast(start, 1, 0, &page);
if (ret != 1)
return ret;
- if (PageHWPoison(p)) {
- put_page(p);
+ if (PageHWPoison(page)) {
+ put_page(page);
continue;
}
- if (bhv == MADV_SOFT_OFFLINE) {
- pr_info("Soft offlining page %#lx at %#lx\n",
- page_to_pfn(p), start);
- ret = soft_offline_page(p, MF_COUNT_INCREASED);
+
+ if (behavior == MADV_SOFT_OFFLINE) {
+ pr_info("Soft offlining pfn %#lx at process virtual address %#lx\n",
+ page_to_pfn(page), start);
+
+ ret = soft_offline_page(page, MF_COUNT_INCREASED);
if (ret)
return ret;
continue;
}
- pr_info("Injecting memory failure for page %#lx at %#lx\n",
- page_to_pfn(p), start);
- ret = memory_failure(page_to_pfn(p), 0, MF_COUNT_INCREASED);
+ pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n",
+ page_to_pfn(page), start);
+
+ ret = memory_failure(page_to_pfn(page), 0, MF_COUNT_INCREASED);
if (ret)
return ret;
}
@@ -756,7 +762,7 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
#ifdef CONFIG_MEMORY_FAILURE
if (behavior == MADV_HWPOISON || behavior == MADV_SOFT_OFFLINE)
- return madvise_hwpoison(behavior, start, start+len_in);
+ return madvise_inject_error(behavior, start, start + len_in);
#endif
if (!madvise_behavior_valid(behavior))
return error;