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authorMax Filippov <jcmvbkbc@gmail.com>2020-07-31 12:38:05 -0700
committerMax Filippov <jcmvbkbc@gmail.com>2020-07-31 14:15:57 -0700
commita0fc1436f1f4f84e93144480bf30e0c958d135b6 (patch)
tree3b2aef37c8000b3ae4a6f205f35c6e0c4dbf53f0 /lib/locking-selftest-rtmutex.h
parent6d65d3769d1910379e1cfa61ebf387efc6bfb22c (diff)
xtensa: add missing exclusive access state management
The result of the s32ex opcode is recorded in the ATOMCTL special register and must be retrieved with the getex opcode. Context switch between s32ex and getex may trash the ATOMCTL register and result in duplicate update or missing update of the atomic variable. Add atomctl8 field to the struct thread_info and use getex to swap ATOMCTL bit 8 as a part of context switch. Clear exclusive access monitor on kernel entry. Cc: stable@vger.kernel.org Fixes: f7c34874f04a ("xtensa: add exclusive atomics support") Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'lib/locking-selftest-rtmutex.h')
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