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mm/page_alloc.c: extract check_[new|free]_page_bad() common part to page_bad_reason()

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We share similar code in check_[new|free]_page_bad() to get the page's bad
reason.

Let's extract it and reduce code duplication.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Link: http://lkml.kernel.org/r/20200411220357.9636-6-richard.weiyang@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wei Yang 2020-06-03 15:58:39 -07:00 committed by Linus Torvalds
parent 534fe5e3c4
commit 58b7f1194f
1 changed files with 17 additions and 19 deletions
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36
mm/page_alloc.c
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@ -1070,7 +1070,7 @@ static inline bool page_expected_state(struct page *page,
return true;
}
static void check_free_page_bad(struct page *page)
static const char *page_bad_reason(struct page *page, unsigned long flags)
{
const char *bad_reason = NULL;
@ -1080,13 +1080,23 @@ static void check_free_page_bad(struct page *page)
bad_reason = "non-NULL mapping";
if (unlikely(page_ref_count(page) != 0))
bad_reason = "nonzero _refcount";
if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_FREE))
bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set";
if (unlikely(page->flags & flags)) {
if (flags == PAGE_FLAGS_CHECK_AT_PREP)
bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag(s) set";
else
bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set";
}
#ifdef CONFIG_MEMCG
if (unlikely(page->mem_cgroup))
bad_reason = "page still charged to cgroup";
#endif
bad_page(page, bad_reason);
return bad_reason;
}
static void check_free_page_bad(struct page *page)
{
bad_page(page,
page_bad_reason(page, PAGE_FLAGS_CHECK_AT_FREE));
}
static inline int check_free_page(struct page *page)
@ -2083,26 +2093,14 @@ static inline void expand(struct zone *zone, struct page *page,
static void check_new_page_bad(struct page *page)
{
const char *bad_reason = NULL;
if (unlikely(page->flags & __PG_HWPOISON)) {
/* Don't complain about hwpoisoned pages */
page_mapcount_reset(page); /* remove PageBuddy */
return;
}
if (unlikely(atomic_read(&page->_mapcount) != -1))
bad_reason = "nonzero mapcount";
if (unlikely(page->mapping != NULL))
bad_reason = "non-NULL mapping";
if (unlikely(page_ref_count(page) != 0))
bad_reason = "nonzero _refcount";
if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_PREP))
bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag set";
#ifdef CONFIG_MEMCG
if (unlikely(page->mem_cgroup))
bad_reason = "page still charged to cgroup";
#endif
bad_page(page, bad_reason);
bad_page(page,
page_bad_reason(page, PAGE_FLAGS_CHECK_AT_PREP));
}
/*