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| author | David Miller <davem@davemloft.net> | 2014-05-05 22:20:04 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-05-06 05:38:49 +0200 |
| commit | 30321c7b658a5661eea715b33e82a5fd3e33e180 (patch) | |
| tree | b317c985e9b3b741ef1c54a420172ea692a297cc /arch | |
| parent | slab: fix the type of the index on freelist index accessor (diff) | |
| download | linux-30321c7b658a5661eea715b33e82a5fd3e33e180.tar.xz linux-30321c7b658a5661eea715b33e82a5fd3e33e180.zip | |
slab: Fix off by one in object max number tests.
If freelist_idx_t is a byte, SLAB_OBJ_MAX_NUM should be 255 not 256, and
likewise if freelist_idx_t is a short, then it should be 65535 not
65536.
This was leading to all kinds of random crashes on sparc64 where
PAGE_SIZE is 8192. One problem shown was that if spinlock debugging was
enabled, we'd get deadlocks in copy_pte_range() or do_wp_page() with the
same cpu already holding a lock it shouldn't hold, or the lock belonging
to a completely unrelated process.
Fixes: a41adfaa23df ("slab: introduce byte sized index for the freelist of a slab")
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions