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| author | Henry Burns <henryburns@google.com> | 2019-07-11 20:52:14 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-26 09:11:07 +0200 |
| commit | 6d468c7832f4bc1d3821e21810f92f11bbcc1add (patch) | |
| tree | 624ac1c42462bdb666b8d76086b0336946238ae5 | |
| parent | 83822dc2deb76399b82c09dc6ec995fe45646026 (diff) | |
| download | linux-6d468c7832f4bc1d3821e21810f92f11bbcc1add.tar.gz linux-6d468c7832f4bc1d3821e21810f92f11bbcc1add.tar.bz2 linux-6d468c7832f4bc1d3821e21810f92f11bbcc1add.zip | |
mm/z3fold.c: lock z3fold page before __SetPageMovable()
commit 810481a246089117d98e3373a3cb735c3efc1f90 upstream.
Following zsmalloc.c's example we call trylock_page() and unlock_page().
Also make z3fold_page_migrate() assert that newpage is passed in locked,
as per the documentation.
[akpm@linux-foundation.org: fix trylock_page return value test, per Shakeel]
Link: http://lkml.kernel.org/r/20190702005122.41036-1-henryburns@google.com
Link: http://lkml.kernel.org/r/20190702233538.52793-1-henryburns@google.com
Signed-off-by: Henry Burns <henryburns@google.com>
Suggested-by: Vitaly Wool <vitalywool@gmail.com>
Acked-by: Vitaly Wool <vitalywool@gmail.com>
Acked-by: David Rientjes <rientjes@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Cc: Vitaly Vul <vitaly.vul@sony.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Xidong Wang <wangxidong_97@163.com>
Cc: Jonathan Adams <jwadams@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | mm/z3fold.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/mm/z3fold.c b/mm/z3fold.c index 985732c8b025..dfcd69d08c1e 100644 --- a/mm/z3fold.c +++ b/mm/z3fold.c @@ -924,7 +924,16 @@ retry: set_bit(PAGE_HEADLESS, &page->private); goto headless; } - __SetPageMovable(page, pool->inode->i_mapping); + if (can_sleep) { + lock_page(page); + __SetPageMovable(page, pool->inode->i_mapping); + unlock_page(page); + } else { + if (trylock_page(page)) { + __SetPageMovable(page, pool->inode->i_mapping); + unlock_page(page); + } + } z3fold_page_lock(zhdr); found: @@ -1331,6 +1340,7 @@ static int z3fold_page_migrate(struct address_space *mapping, struct page *newpa VM_BUG_ON_PAGE(!PageMovable(page), page); VM_BUG_ON_PAGE(!PageIsolated(page), page); + VM_BUG_ON_PAGE(!PageLocked(newpage), newpage); zhdr = page_address(page); pool = zhdr_to_pool(zhdr); |