Merge patch series "riscv: some CMO alternative related clean up"

These cleanups came up as part of the discussion on the "riscv: Reduce
ARCH_KMALLOC_MINALIGN to 8" patch set, but that needs additional work
and thus will be delayed at least a cycle.

* b4-shazam-merge:
  riscv: mm: mark noncoherent_supported as __ro_after_init
  riscv: mm: mark CBO relate initialization funcs as __init
  riscv: errata: thead: only set cbom size & noncoherent during boot

Link: https://lore.kernel.org/linux-riscv/20230526165958.908-1-jszhang@kernel.org/
Link: https://lore.kernel.org/r/20230614165504.532-1-jszhang@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/errata/thead/errata.c

@@ -45,8 +45,11 @@ static bool errata_probe_cmo(unsigned int stage,
 	if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
 		return false;
 
-	riscv_cbom_block_size = L1_CACHE_BYTES;
-	riscv_noncoherent_supported();
+	if (stage == RISCV_ALTERNATIVES_BOOT) {
+		riscv_cbom_block_size = L1_CACHE_BYTES;
+		riscv_noncoherent_supported();
+	}
+
 	return true;
 }
 

arch/riscv/mm/cacheflush.c

@@ -104,9 +104,9 @@ EXPORT_SYMBOL_GPL(riscv_cbom_block_size);
 unsigned int riscv_cboz_block_size;
 EXPORT_SYMBOL_GPL(riscv_cboz_block_size);
 
-static void cbo_get_block_size(struct device_node *node,
-			       const char *name, u32 *block_size,
-			       unsigned long *first_hartid)
+static void __init cbo_get_block_size(struct device_node *node,
+				      const char *name, u32 *block_size,
+				      unsigned long *first_hartid)
 {
 	unsigned long hartid;
 	u32 val;
@@ -126,7 +126,7 @@ static void cbo_get_block_size(struct device_node *node,
 	}
 }
 
-void riscv_init_cbo_blocksizes(void)
+void __init riscv_init_cbo_blocksizes(void)
 {
 	unsigned long cbom_hartid, cboz_hartid;
 	u32 cbom_block_size = 0, cboz_block_size = 0;

arch/riscv/mm/dma-noncoherent.c

@@ -10,7 +10,7 @@
 #include <linux/mm.h>
 #include <asm/cacheflush.h>
 
-static bool noncoherent_supported;
+static bool noncoherent_supported __ro_after_init;
 
 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
 			      enum dma_data_direction dir)