[PATCH v6 1/2] riscv: mm: Make mark_new_valid_map() stuff depend on 64BIT && MMU

[Vivian Wang]

None of the code relating to mark_new_valid_map() does anything useful
without CONFIG_64BIT=y && CONFIG_MMU=y, because the
new_valid_map_cpus_check code is only used if CONFIG_64BIT, and the
exception codes checked there can only happen with CONFIG_MMU=y.

Therefore, make these conditional on CONFIG_64BIT=y && CONFIG_MMU=y to
simplify programming, since we do not have to handle CONFIG_MMU=n when
changing this code in the future. This also removes some unused code on
the entry path for CONFIG_MMU=n.

Signed-off-by: Vivian Wang <wangruikang at iscas.ac.cn>
---
 arch/riscv/include/asm/cacheflush.h | 2 +-
 arch/riscv/kernel/entry.S           | 2 +-
 arch/riscv/mm/init.c                | 2 ++
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h
index 8cfe59483a8f..58e787fad029 100644
--- a/arch/riscv/include/asm/cacheflush.h
+++ b/arch/riscv/include/asm/cacheflush.h
@@ -40,7 +40,7 @@ do {							\
 		flush_icache_mm(vma->vm_mm, 0);		\
 } while (0)
 
-#ifdef CONFIG_64BIT
+#if defined(CONFIG_64BIT) && defined(CONFIG_MMU)
 /* This is accessed in assembly code. cpumask_var_t would be too complex. */
 extern DECLARE_BITMAP(new_valid_map_cpus, NR_CPUS);
 extern char _end[];
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index c6988983cdf7..3ae498779adf 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -137,7 +137,7 @@ SYM_CODE_START(handle_exception)
 .Lrestore_kernel_tpsp:
 	csrr tp, CSR_SCRATCH
 
-#ifdef CONFIG_64BIT
+#if defined(CONFIG_64BIT) && defined(CONFIG_MMU)
 	/*
 	 * The RISC-V kernel does not flush TLBs on all CPUS after each new
 	 * vmalloc mapping or kfence_unprotect(), which may result in
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 5b1b3c88b4d1..3e450890be07 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -37,7 +37,9 @@
 
 #include "../kernel/head.h"
 
+#if defined(CONFIG_64BIT) && defined(CONFIG_MMU)
 DECLARE_BITMAP(new_valid_map_cpus, NR_CPUS);
+#endif
 
 struct kernel_mapping kernel_map __ro_after_init;
 EXPORT_SYMBOL(kernel_map);

-- 
2.54.0