Mikulas Patocka 8238b45798 wait_on_bit: add an acquire memory barrier ... There are several places in the kernel where wait_on_bit is not followed by a memory barrier (for example, in drivers/md/dm-bufio.c:new_read). On architectures with weak memory ordering, it may happen that memory accesses that follow wait_on_bit are reordered before wait_on_bit and they may return invalid data. Fix this class of bugs by introducing a new function "test_bit_acquire" that works like test_bit, but has acquire memory ordering semantics. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Acked-by: Will Deacon <will@kernel.org> Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2022-08-26 09:30:25 -07:00
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asm	wait_on_bit: add an acquire memory barrier	2022-08-26 09:30:25 -07:00
uapi/asm	- SGX2 ISA support which makes enclave memory management much more	2022-08-05 10:47:40 -07:00