linux

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Jisheng Zhang 738fa58ee1 arm64: kprobes: Restore local irqflag if kprobes is cancelled

If instruction being single stepped caused a page fault, the kprobes
is cancelled to let the page fault handler continue as a normal page
fault. But the local irqflags are disabled so cpu will restore pstate
with DAIF masked. After pagefault is serviced, the kprobes is
triggerred again, we overwrite the saved_irqflag by calling
kprobes_save_local_irqflag(). NOTE, DAIF is masked in this new saved
irqflag. After kprobes is serviced, the cpu pstate is retored with
DAIF masked.

This patch is inspired by one patch for riscv from Liao Chang.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20210412174101.6bfb0594@xhacker.debian
Signed-off-by: Will Deacon <will@kernel.org>

2021-04-13 09:30:16 +01:00

alpha

io_uring-worker.v3-2021-02-25

2021-02-27 08:29:02 -08:00

arc

arch: setup PF_IO_WORKER threads like PF_KTHREAD

2021-02-21 17:25:22 -07:00

arm

xen: branch for v5.12-rc2

2021-03-04 11:24:47 -08:00

arm64

arm64: kprobes: Restore local irqflag if kprobes is cancelled