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author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-24 15:24:21 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-24 15:24:21 +0200 |
commit | 637d0957516eef3e861ca5889912c3234a9b593f (patch) | |
tree | 8df51837d2ec9cba39e333acd94de5f685466d5e /net/core/page_pool.c | |
parent | lkdtm: remove IDE_CORE_CP crashpoint (diff) | |
parent | Linux 5.14-rc7 (diff) | |
download | linux-dev-637d0957516eef3e861ca5889912c3234a9b593f.tar.xz linux-dev-637d0957516eef3e861ca5889912c3234a9b593f.zip |
Merge 5.14-rc7 into char-misc-next
We need the char/misc fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/core/page_pool.c')
-rw-r--r-- | net/core/page_pool.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/net/core/page_pool.c b/net/core/page_pool.c index 5e4eb45b139c..8ab7b402244c 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -634,7 +634,15 @@ bool page_pool_return_skb_page(struct page *page) struct page_pool *pp; page = compound_head(page); - if (unlikely(page->pp_magic != PP_SIGNATURE)) + + /* page->pp_magic is OR'ed with PP_SIGNATURE after the allocation + * in order to preserve any existing bits, such as bit 0 for the + * head page of compound page and bit 1 for pfmemalloc page, so + * mask those bits for freeing side when doing below checking, + * and page_is_pfmemalloc() is checked in __page_pool_put_page() + * to avoid recycling the pfmemalloc page. + */ + if (unlikely((page->pp_magic & ~0x3UL) != PP_SIGNATURE)) return false; pp = page->pp; |