riscv/signal: Fixup additional syscall restarting

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The function of do_notify_resume called by entry.S could be entered
in loop when SIGPENDING was setted again before sret. So we must add
prevent code to make syscall restart (regs->sepc -= 0x4) or it may
re-execute unexpected instructions.

Just like in_syscall & forget_syscall used by arm.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

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Guo Ren 2019-04-02 16:02:33 +08:00 • committed by Palmer Dabbelt

parent 085b775580

commit 7a64f3f1cf

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arch/riscv/kernel/signal.c

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