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authorHector Martin <marcan@marcan.st>2022-08-16 16:03:11 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2022-08-16 09:19:43 -0700
commit415d832497098030241605c52ea83d4e2cfa7879 (patch)
tree70060c0f4976031b93ad41750546db2b11c118b2 /Documentation
parent568035b01cfb107af8d2e4bd2fb9aea22cf5b868 (diff)
locking/atomic: Make test_and_*_bit() ordered on failure
These operations are documented as always ordered in include/asm-generic/bitops/instrumented-atomic.h, and producer-consumer type use cases where one side needs to ensure a flag is left pending after some shared data was updated rely on this ordering, even in the failure case. This is the case with the workqueue code, which currently suffers from a reproducible ordering violation on Apple M1 platforms (which are notoriously out-of-order) that ends up causing the TTY layer to fail to deliver data to userspace properly under the right conditions. This change fixes that bug. Change the documentation to restrict the "no order on failure" story to the _lock() variant (for which it makes sense), and remove the early-exit from the generic implementation, which is what causes the missing barrier semantics in that case. Without this, the remaining atomic op is fully ordered (including on ARM64 LSE, as of recent versions of the architecture spec). Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: stable@vger.kernel.org Fixes: e986a0d6cb36 ("locking/atomics, asm-generic/bitops/atomic.h: Rewrite using atomic_*() APIs") Fixes: 61e02392d3c7 ("locking/atomic/bitops: Document and clarify ordering semantics for failed test_and_{}_bit()") Signed-off-by: Hector Martin <marcan@marcan.st> Acked-by: Will Deacon <will@kernel.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/atomic_bitops.txt2
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/atomic_bitops.txt b/Documentation/atomic_bitops.txt
index 093cdaefdb37..d8b101c97031 100644
--- a/Documentation/atomic_bitops.txt
+++ b/Documentation/atomic_bitops.txt
@@ -59,7 +59,7 @@ Like with atomic_t, the rule of thumb is:
- RMW operations that have a return value are fully ordered.
- RMW operations that are conditional are unordered on FAILURE,
- otherwise the above rules apply. In the case of test_and_{}_bit() operations,
+ otherwise the above rules apply. In the case of test_and_set_bit_lock(),
if the bit in memory is unchanged by the operation then it is deemed to have
failed.