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| author | Ralph Campbell <rcampbell@nvidia.com> | 2019-11-15 17:35:07 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-11-15 18:34:00 -0800 |
| commit | 6855ac4acd3bad4a5caf813b0e401a0bc79a54a9 (patch) | |
| tree | 0d4ae934e93fb95bf1f25a8e5af6587bb6e1fbc4 | |
| parent | 76a1850e45724e8aca44fc0a245de6782ce42e65 (diff) | |
| download | linux-6855ac4acd3bad4a5caf813b0e401a0bc79a54a9.tar.gz linux-6855ac4acd3bad4a5caf813b0e401a0bc79a54a9.tar.bz2 linux-6855ac4acd3bad4a5caf813b0e401a0bc79a54a9.zip | |
mm/debug.c: PageAnon() is true for PageKsm() pages
PageAnon() and PageKsm() use the low two bits of the page->mapping
pointer to indicate the page type. PageAnon() only checks the LSB while
PageKsm() checks the least significant 2 bits are equal to 3.
Therefore, PageAnon() is true for KSM pages. __dump_page() incorrectly
will never print "ksm" because it checks PageAnon() first. Fix this by
checking PageKsm() first.
Link: http://lkml.kernel.org/r/20191113000651.20677-1-rcampbell@nvidia.com
Fixes: 1c6fb1d89e73 ("mm: print more information about mapping in __dump_page")
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/debug.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/debug.c b/mm/debug.c index 772d4cf0691f..0461df1207cb 100644 --- a/mm/debug.c +++ b/mm/debug.c @@ -77,10 +77,10 @@ void __dump_page(struct page *page, const char *reason) pr_warn("page:%px refcount:%d mapcount:%d mapping:%px index:%#lx\n", page, page_ref_count(page), mapcount, page->mapping, page_to_pgoff(page)); - if (PageAnon(page)) - pr_warn("anon flags: %#lx(%pGp)\n", page->flags, &page->flags); - else if (PageKsm(page)) + if (PageKsm(page)) pr_warn("ksm flags: %#lx(%pGp)\n", page->flags, &page->flags); + else if (PageAnon(page)) + pr_warn("anon flags: %#lx(%pGp)\n", page->flags, &page->flags); else if (mapping) { if (mapping->host && mapping->host->i_dentry.first) { struct dentry *dentry; |