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author | Matthew Wilcox <willy@infradead.org> | 2017-11-22 14:36:00 +0100 |
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committer | Matthew Wilcox <willy@infradead.org> | 2018-10-21 16:46:39 +0200 |
commit | e21a29552fa3f44ea41c53488875015ae70fd7f8 (patch) | |
tree | 615c10e662faa49f3910fb269d4be6d029513632 /lib | |
parent | shmem: Convert shmem_confirm_swap to XArray (diff) | |
download | linux-e21a29552fa3f44ea41c53488875015ae70fd7f8.tar.xz linux-e21a29552fa3f44ea41c53488875015ae70fd7f8.zip |
shmem: Convert find_swap_entry to XArray
This is a 1:1 conversion. The major part of this patch is converting
the test framework from userspace to kernel space and mirroring the
algorithm now used in find_swap_entry().
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'lib')
-rw-r--r-- | lib/test_xarray.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/lib/test_xarray.c b/lib/test_xarray.c index 128c6489082f..815daffdd8c9 100644 --- a/lib/test_xarray.c +++ b/lib/test_xarray.c @@ -631,6 +631,61 @@ static noinline void check_find(struct xarray *xa) check_multi_find_2(xa); } +/* See find_swap_entry() in mm/shmem.c */ +static noinline unsigned long xa_find_entry(struct xarray *xa, void *item) +{ + XA_STATE(xas, xa, 0); + unsigned int checked = 0; + void *entry; + + rcu_read_lock(); + xas_for_each(&xas, entry, ULONG_MAX) { + if (xas_retry(&xas, entry)) + continue; + if (entry == item) + break; + checked++; + if ((checked % 4) != 0) + continue; + xas_pause(&xas); + } + rcu_read_unlock(); + + return entry ? xas.xa_index : -1; +} + +static noinline void check_find_entry(struct xarray *xa) +{ +#ifdef CONFIG_XARRAY_MULTI + unsigned int order; + unsigned long offset, index; + + for (order = 0; order < 20; order++) { + for (offset = 0; offset < (1UL << (order + 3)); + offset += (1UL << order)) { + for (index = 0; index < (1UL << (order + 5)); + index += (1UL << order)) { + xa_store_order(xa, index, order, + xa_mk_value(index), GFP_KERNEL); + XA_BUG_ON(xa, xa_load(xa, index) != + xa_mk_value(index)); + XA_BUG_ON(xa, xa_find_entry(xa, + xa_mk_value(index)) != index); + } + XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1); + xa_destroy(xa); + } + } +#endif + + XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1); + xa_store_index(xa, ULONG_MAX, GFP_KERNEL); + XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1); + XA_BUG_ON(xa, xa_find_entry(xa, xa_mk_value(LONG_MAX)) != -1); + xa_erase_index(xa, ULONG_MAX); + XA_BUG_ON(xa, !xa_empty(xa)); +} + static noinline void check_move_small(struct xarray *xa, unsigned long idx) { XA_STATE(xas, xa, 0); @@ -972,6 +1027,7 @@ static int xarray_checks(void) check_multi_store(&array); check_xa_alloc(); check_find(&array); + check_find_entry(&array); check_destroy(&array); check_move(&array); check_create_range(&array); |