[PATCH 5/9] nds32: Fix xfs_buf built failed by export invalidate_kernel_vmap_range and flush_kernel_vmap_range

[Greentime Hu]

It broke the 'allmodconfig' build.
fs/xfs/xfs_buf.c: In function 'xfs_buf_bio_end_io':
fs/xfs/xfs_buf.c:1242:3: error: implicit declaration of function 
'invalidate_kernel_vmap_range' [-Werror=implicit-function-declaration]
   invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp));
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/xfs/xfs_buf.c: In function 'xfs_buf_ioapply_map':
fs/xfs/xfs_buf.c:1312:4: error: implicit declaration of function 
'flush_kernel_vmap_range' [-Werror=implicit-function-declaration]
    flush_kernel_vmap_range(bp->b_addr,
    ^~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Greentime Hu <greent...@andestech.com>
---
 arch/nds32/include/asm/cacheflush.h |  2 ++
 arch/nds32/mm/cacheflush.c          | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/arch/nds32/include/asm/cacheflush.h 
b/arch/nds32/include/asm/cacheflush.h
index 1240f148ec0f..10b48f0d8e85 100644
--- a/arch/nds32/include/asm/cacheflush.h
+++ b/arch/nds32/include/asm/cacheflush.h
@@ -32,6 +32,8 @@ void flush_anon_page(struct vm_area_struct *vma,
 
 #define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
 void flush_kernel_dcache_page(struct page *page);
+void flush_kernel_vmap_range(void *addr, int size);
+void invalidate_kernel_vmap_range(void *addr, int size);
 void flush_icache_range(unsigned long start, unsigned long end);
 void flush_icache_page(struct vm_area_struct *vma, struct page *page);
 #define flush_dcache_mmap_lock(mapping)   xa_lock_irq(&(mapping)->i_pages)
diff --git a/arch/nds32/mm/cacheflush.c b/arch/nds32/mm/cacheflush.c
index 6eb786a399a2..bd52918d5923 100644
--- a/arch/nds32/mm/cacheflush.c
+++ b/arch/nds32/mm/cacheflush.c
@@ -273,6 +273,24 @@ void flush_kernel_dcache_page(struct page *page)
        local_irq_restore(flags);
 }
 
+void flush_kernel_vmap_range(void *addr, int size)
+{
+       unsigned long flags;
+       local_irq_save(flags);
+       cpu_dcache_wb_range((unsigned long)addr, (unsigned long)addr +  size);
+       local_irq_restore(flags);
+}
+EXPORT_SYMBOL(flush_kernel_vmap_range);
+
+void invalidate_kernel_vmap_range(void *addr, int size)
+{
+       unsigned long flags;
+       local_irq_save(flags);
+       cpu_dcache_inval_range((unsigned long)addr, (unsigned long)addr + size);
+       local_irq_restore(flags);
+}
+EXPORT_SYMBOL(invalidate_kernel_vmap_range);
+
 void flush_icache_range(unsigned long start, unsigned long end)
 {
        unsigned long line_size, flags;
-- 
1.9.5