[PATCH v10 2/9] riscv: add infrastructure for preemptible this_cpu operations

[David Laight]

On Thu, 12 Nov 2026 18:41:42 +0800
Yunhui Cui <cuiyunhui at bytedance.com> wrote:

> +/*
> + * Mark a region where the per-CPU offset and address registers may need to
> + * be rewritten by exception return after migration.  The three registers
> + * must remain distinct for the whole region.
> + */
> +#define __PCPU_GPRS_BEGIN						\
> +	__DEFINE_ASM_GPR_NUMS						\
> +	__PCPU_GPRS_ASSERT_DISTINCT					\
> +	"li %[off], " __PCPU_GPRS_VALUE "\n"				\
> +	"sh %[off], %[gprs]\n"						\
> +	REG_L " %[off], %[pcpu_offset]\n"				\
> +	"add %[addr], %[pcp], %[off]\n"
> +
> +#define __PCPU_GPRS_END							\
> +	"sh zero, %[gprs]\n"

Those are quite nasty with all the hidden variable names.
It wouldn't do any harm to pass the names though.

David