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mm/page_idle.c: skip offline pages

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'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>
This commit is contained in:
SeongJae Park 2020-06-07 21:40:04 -07:00 committed by Linus Torvalds
parent 9aa900c809
commit 92fb1db26e
1 changed files with 2 additions and 5 deletions
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7
mm/page_idle.c
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@ -4,6 +4,7 @@
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/sysfs.h> #include <linux/sysfs.h>
#include <linux/kobject.h> #include <linux/kobject.h>
#include <linux/memory_hotplug.h>
#include <linux/mm.h> #include <linux/mm.h>
#include <linux/mmzone.h> #include <linux/mmzone.h>
#include <linux/pagemap.h> #include <linux/pagemap.h>
@ -30,13 +31,9 @@
*/ */
static struct page *page_idle_get_page(unsigned long pfn) 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; pg_data_t *pgdat;
if (!pfn_valid(pfn))
return NULL;
page = pfn_to_page(pfn);
if (!page || !PageLRU(page) || if (!page || !PageLRU(page) ||
!get_page_unless_zero(page)) !get_page_unless_zero(page))
return NULL; return NULL;