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Using ISA string "xsfcflushdlone" to detect the support of the SiFive L1D cache flush custom instruction. Reviewed-by: Cyan Yang <cyan.yang@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Nick Hu <nick.hu@sifive.com> Link: https://lore.kernel.org/r/20251020-cache-upstream-v7-5-69a132447d8a@sifive.com Signed-off-by: Anup Patel <anup@brainfault.org>