RISC-V: Avoid coupling the T-Head CMOs and Zicbom

We could make the T-Head CMOs depend on a new-enough assembler to have
Zicbom, but it's not strictly necessary because the T-Head CMOs
circumvent the assembler.

Fixes: 8f7e001 ("RISC-V: Clean up the Zicbom block size probing")
Reported-by: kernel test robot <[email protected]>
Reported-by: Conor Dooley <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>
Reviewed-by: Heiko Stuebner <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: palmer-dabbelt

arch/riscv/include/asm/cacheflush.h

@@ -42,8 +42,12 @@ void flush_icache_mm(struct mm_struct *mm, bool local);
 
 #endif /* CONFIG_SMP */
 
-#ifdef CONFIG_RISCV_ISA_ZICBOM
+/*
+ * The T-Head CMO errata internally probe the CBOM block size, but otherwise
+ * don't depend on Zicbom.
+ */
 extern unsigned int riscv_cbom_block_size;
+#ifdef CONFIG_RISCV_ISA_ZICBOM
 void riscv_init_cbom_blocksize(void);
 #else
 static inline void riscv_init_cbom_blocksize(void) { }