xtensa: save/restore scompare1 during context switch
Xtensa uses two instructions to perform atomic compare-and-set
instruction: first the comparison register, then the actual
instruction to do compare-and-set. There is a potential that
context switching is performed before these two instructions.
A restored context may have the wrong value in the comparison
register. So we need to save and restore the comparison
register during context switching.
Fixes #21800
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
3 files changed
