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| author | SeongJae Park <sjpark@amazon.de> | 2020-06-07 21:40:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-08 11:05:55 -0700 |
| commit | 92fb1db26eefc11554820f11ce8e92007da2fbf4 (patch) | |
| tree | 5de7e60db1dad71f124f9ec55d421022bed61122 /mm/page_idle.c | |
| parent | 9aa900c8094dba7a60dc805ecec1e9f720744ba1 (diff) | |
| download | linux-92fb1db26eefc11554820f11ce8e92007da2fbf4.tar.bz2 | |
mm/page_idle.c: skip offline pages
'Idle page tracking' users can pass random pfn that might be mapped to an
offline page. To avoid accessing such pages, this commit modifies the
'page_idle_get_page()' to use 'pfn_to_online_page()' instead of
'pfn_valid()' and 'pfn_to_page()' combination, so that the pfn mapped to
an offline page can be skipped.
Reported-by: David Hildenbrand <david@redhat.com>
Signed-off-by: SeongJae Park <sjpark@amazon.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Link: http://lkml.kernel.org/r/20200605092502.18018-2-sjpark@amazon.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_idle.c')
| -rw-r--r-- | mm/page_idle.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/mm/page_idle.c b/mm/page_idle.c index 295512465065..057c61df12db 100644 --- a/mm/page_idle.c +++ b/mm/page_idle.c @@ -4,6 +4,7 @@ #include <linux/fs.h> #include <linux/sysfs.h> #include <linux/kobject.h> +#include <linux/memory_hotplug.h> #include <linux/mm.h> #include <linux/mmzone.h> #include <linux/pagemap.h> @@ -30,13 +31,9 @@ */ static struct page *page_idle_get_page(unsigned long pfn) { - struct page *page; + struct page *page = pfn_to_online_page(pfn); pg_data_t *pgdat; - if (!pfn_valid(pfn)) - return NULL; - - page = pfn_to_page(pfn); if (!page || !PageLRU(page) || !get_page_unless_zero(page)) return NULL; |