riscv: poison SBI calls for M-mode
There is no SBI when we run in M-mode, so fail the compile for any code trying to use SBI calls. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
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