[PATCH] linux: add RISC-V rseq signature

[Florian Weimer]

* Mathieu Desnoyers:

> From: Michael Jeanson <mjeanson@efficios.com>
>
> The rseq syscall for the RISC-V architecture was added in Linux 5.18.
>
> Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

I think the current guidance is that if you use Signed-off-by:, newly
added files shouldn't have FSF copyright.  With FSF copyright, the year
on new files should start 2022, per FSF guidance.

> +#if __BYTE_ORDER == __LITTLE_ENDIAN
> +#define RSEQ_SIG	 0xf1401073
> +#endif

“# define” per our style, I think.  (I haven't verified that the number
is okay.)

Thanks,
Florian