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| author | Mike Kravetz <mike.kravetz@oracle.com> | 2018-06-07 17:05:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-07 17:34:34 -0700 |
| commit | 5b9c98f3082b4e8a24ef5e6bb21ed0558b54349a (patch) | |
| tree | 31596c393338aa139003aabf2776df2d1b708b1f /mm/shmem.c | |
| parent | c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 (diff) | |
| download | linux-5b9c98f3082b4e8a24ef5e6bb21ed0558b54349a.tar.bz2 | |
mm/shmem: add __rcu annotations and properly deref radix entry
Patch series "restructure memfd code", v4.
This patch (of 3):
In preparation for memfd code restucture, clean up sparse warnings.
Most changes required adding __rcu annotations. The routine
find_swap_entry was modified to properly deference radix tree entries.
Link: http://lkml.kernel.org/r/20180415182119.4517-2-mike.kravetz@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Marc-Andr Lureau <marcandre.lureau@gmail.com>
Cc: David Herrmann <dh.herrmann@gmail.com>
Cc: Khalid Aziz <khalid.aziz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/shmem.c')
| -rw-r--r-- | mm/shmem.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index 8c43e207cd3b..54bec60380df 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -327,7 +327,7 @@ static int shmem_radix_tree_replace(struct address_space *mapping, pgoff_t index, void *expected, void *replacement) { struct radix_tree_node *node; - void **pslot; + void __rcu **pslot; void *item; VM_BUG_ON(!expected); @@ -395,7 +395,7 @@ static bool shmem_confirm_swap(struct address_space *mapping, #ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE /* ifdef here to avoid bloating shmem.o when not necessary */ -int shmem_huge __read_mostly; +static int shmem_huge __read_mostly; #if defined(CONFIG_SYSFS) || defined(CONFIG_TMPFS) static int shmem_parse_huge(const char *str) @@ -682,7 +682,7 @@ unsigned long shmem_partial_swap_usage(struct address_space *mapping, pgoff_t start, pgoff_t end) { struct radix_tree_iter iter; - void **slot; + void __rcu **slot; struct page *page; unsigned long swapped = 0; @@ -1098,13 +1098,19 @@ static void shmem_evict_inode(struct inode *inode) static unsigned long find_swap_entry(struct radix_tree_root *root, void *item) { struct radix_tree_iter iter; - void **slot; + void __rcu **slot; unsigned long found = -1; unsigned int checked = 0; rcu_read_lock(); radix_tree_for_each_slot(slot, root, &iter, 0) { - if (*slot == item) { + void *entry = radix_tree_deref_slot(slot); + + if (radix_tree_deref_retry(entry)) { + slot = radix_tree_iter_retry(&iter); + continue; + } + if (entry == item) { found = iter.index; break; } @@ -2622,7 +2628,7 @@ static loff_t shmem_file_llseek(struct file *file, loff_t offset, int whence) static void shmem_tag_pins(struct address_space *mapping) { struct radix_tree_iter iter; - void **slot; + void __rcu **slot; pgoff_t start; struct page *page; @@ -2664,7 +2670,7 @@ static void shmem_tag_pins(struct address_space *mapping) static int shmem_wait_for_pins(struct address_space *mapping) { struct radix_tree_iter iter; - void **slot; + void __rcu **slot; pgoff_t start; struct page *page; int error, scan; |