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In do_ast, make sure the interrupts are enabled before calling ast().

Description

In do_ast, make sure the interrupts are enabled before calling ast().
We can reach that point with IRQs disabled, and calling ast() with IRQs ?\127
disabled can lead to a deadlock.
This should fix the freezes on arm64 under load.

Reviewed by: andrew

Details

Committed
cognetFeb 26 2018, 1:12 PM
Reviewer
andrew
Parents
rS330017: MFC r329563:
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