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mm/page_alloc.c: bad_flags is not necessary for bad_page() 

After commit 5b57b8f227 ("mm/debug.c: always print flags in
dump_page()"), page->flags is always printed for a bad page.  It is not
necessary to have bad_flags any more.

Suggested-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Link: http://lkml.kernel.org/r/20200411220357.9636-3-richard.weiyang@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wei Yang 2020-06-03 15:58:29 -07:00 committed by Linus Torvalds
parent 833d8a426f
commit 82a3241a8f
1 changed files with 10 additions and 24 deletions
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34
mm/page_alloc.c
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@ -607,8 +607,7 @@ static inline int __maybe_unused bad_range(struct zone *zone, struct page *page)
}
#endif
static void bad_page(struct page *page, const char *reason,
unsigned long bad_flags)
static void bad_page(struct page *page, const char *reason)
{
static unsigned long resume;
static unsigned long nr_shown;
@ -637,10 +636,6 @@ static void bad_page(struct page *page, const char *reason,
pr_alert("BUG: Bad page state in process %s pfn:%05lx\n",
current->comm, page_to_pfn(page));
__dump_page(page, reason);
bad_flags &= page->flags;
if (bad_flags)
pr_alert("bad because of flags: %#lx(%pGp)\n",
bad_flags, &bad_flags);
dump_page_owner(page);
print_modules();
@ -1077,11 +1072,7 @@ static inline bool page_expected_state(struct page *page,
static void free_pages_check_bad(struct page *page)
{
const char *bad_reason;
unsigned long bad_flags;
bad_reason = NULL;
bad_flags = 0;
const char *bad_reason = NULL;
if (unlikely(atomic_read(&page->_mapcount) != -1))
bad_reason = "nonzero mapcount";
@ -1089,15 +1080,13 @@ static void free_pages_check_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)) {
if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_FREE))
bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set";
bad_flags = PAGE_FLAGS_CHECK_AT_FREE;
}
#ifdef CONFIG_MEMCG
if (unlikely(page->mem_cgroup))
bad_reason = "page still charged to cgroup";
#endif
bad_page(page, bad_reason, bad_flags);
bad_page(page, bad_reason);
}
static inline int free_pages_check(struct page *page)
@ -1128,7 +1117,7 @@ static int free_tail_pages_check(struct page *head_page, struct page *page)
case 1:
/* the first tail page: ->mapping may be compound_mapcount() */
if (unlikely(compound_mapcount(page))) {
bad_page(page, "nonzero compound_mapcount", 0);
bad_page(page, "nonzero compound_mapcount");
goto out;
}
break;
@ -1140,17 +1129,17 @@ static int free_tail_pages_check(struct page *head_page, struct page *page)
break;
default:
if (page->mapping != TAIL_MAPPING) {
bad_page(page, "corrupted mapping in tail page", 0);
bad_page(page, "corrupted mapping in tail page");
goto out;
}
break;
}
if (unlikely(!PageTail(page))) {
bad_page(page, "PageTail not set", 0);
bad_page(page, "PageTail not set");
goto out;
}
if (unlikely(compound_head(page) != head_page)) {
bad_page(page, "compound_head not consistent", 0);
bad_page(page, "compound_head not consistent");
goto out;
}
ret = 0;
@ -2095,7 +2084,6 @@ static inline void expand(struct zone *zone, struct page *page,
static void check_new_page_bad(struct page *page)
{
const char *bad_reason = NULL;
unsigned long bad_flags = 0;
if (unlikely(page->flags & __PG_HWPOISON)) {
/* Don't complain about hwpoisoned pages */
@ -2108,15 +2096,13 @@ static void check_new_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_PREP)) {
if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_PREP))
bad_reason = "PAGE_FLAGS_CHECK_AT_PREP flag set";
bad_flags = PAGE_FLAGS_CHECK_AT_PREP;
}
#ifdef CONFIG_MEMCG
if (unlikely(page->mem_cgroup))
bad_reason = "page still charged to cgroup";
#endif
bad_page(page, bad_reason, bad_flags);
bad_page(page, bad_reason);
}
/*