arm64: insn: Don't fallback on nosync path for general insn patching

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Patching kernel instructions at runtime requires other CPUs to undergo
a context synchronisation event via an explicit ISB or an IPI in order
to ensure that the new instructions are visible. This is required even
for "hotpatch" instructions such as NOP and BL, so avoid optimising in
this case and always go via stop_machine() when performing general
patching.

ftrace isn't quite as strict, so it can continue to call the nosync
code directly.

Signed-off-by: Will Deacon <will.deacon@arm.com>

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Will Deacon 2018-06-19 17:55:28 +01:00

parent 3b8c9f1cdf

commit 693350a799

2 changed files with 1 additions and 57 deletions

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arch/arm64/include/asm/insn.h

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56

arch/arm64/kernel/insn.c

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