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mm, hwpoison: fixup "mm: check the return value of lookup_page_ext for all call sites"

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Backport of the upstream commit f86e427197 ("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>
This commit is contained in:
Michal Hocko 2017-11-24 11:13:07 +01:00 committed by Greg Kroah-Hartman
parent 5baf0fb260
commit 0208fabf72
1 changed files with 3 additions and 3 deletions
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6
mm/debug-pagealloc.c
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@ -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);
}