RISC-V: Move to generic spinlocks
Our existing spinlocks aren't fair and replacing them has been on the TODO list for a long time. This moves to the recently-introduced ticket spinlocks, which are simple enough that they are likely to be correct and fast on the vast majority of extant implementations. This introduces a horrible hack that allows us to split out the spinlock conversion from the rwlock conversion. We have to do the spinlocks first because qrwlock needs fair spinlocks, but we don't want to pollute the asm-generic code to support the generic spinlocks without qrwlocks. Thus we pollute the RISC-V code, but just until the next commit as it's all going away. Reviewed-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Guo Ren <guoren@kernel.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Conor Dooley <conor.dooley@microchip.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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