diff options
| author | Michal Hocko <mhocko@suse.com> | 2017-11-24 11:13:07 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-24 11:26:29 +0100 |
| commit | 0208fabf7256245125fbabf03207a0da4000ea2d (patch) | |
| tree | 9921888d7dd6c9250dea8101ed6df081666416d1 | |
| parent | 5baf0fb260fc59d632ba150f442a5904650d6170 (diff) | |
mm, hwpoison: fixup "mm: check the return value of lookup_page_ext for all call sites"
Backport of the upstream commit f86e4271978b ("mm: check the return
value of lookup_page_ext for all call sites") is wrong for hwpoison
pages. I have accidentally negated the condition for bailout. This
basically disables hwpoison pages tracking while the code still
might crash on unusual configurations when struct pages do not have
page_ext allocated. The fix is trivial to invert the condition.
Reported-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | mm/debug-pagealloc.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/debug-pagealloc.c b/mm/debug-pagealloc.c index fe1c61f7cf26..3b8f1b83610e 100644 --- a/mm/debug-pagealloc.c +++ b/mm/debug-pagealloc.c @@ -34,7 +34,7 @@ static inline void set_page_poison(struct page *page) struct page_ext *page_ext; page_ext = lookup_page_ext(page); - if (page_ext) + if (!page_ext) return; __set_bit(PAGE_EXT_DEBUG_POISON, &page_ext->flags); } @@ -44,7 +44,7 @@ static inline void clear_page_poison(struct page *page) struct page_ext *page_ext; page_ext = lookup_page_ext(page); - if (page_ext) + if (!page_ext) return; __clear_bit(PAGE_EXT_DEBUG_POISON, &page_ext->flags); } @@ -54,7 +54,7 @@ static inline bool page_poison(struct page *page) struct page_ext *page_ext; page_ext = lookup_page_ext(page); - if (page_ext) + if (!page_ext) return false; return test_bit(PAGE_EXT_DEBUG_POISON, &page_ext->flags); } |