[PATCH] mm: filemap: Fix microblaze build failure with 'mmu_defconfig'

[Will Deacon]

Commit f9ce0be71d1f ("mm: Cleanup faultaround and finish_fault()
codepaths") added a call to 'update_mmu_cache()' in mm/filemap.c, which
breaks the build for microblaze:

  | mm/filemap.c: In function 'filemap_map_pages':
  | mm/filemap.c:3153:3: error: implicit declaration of function 'update_mmu_cache'; did you mean 'update_mmu_tlb'?

Include asm/tlbflush.h in mm/filemap.c to make sure that the function
(or indeed, macro) is available.

Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210209202449.GA104837@xxxxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
---
 mm/filemap.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/filemap.c b/mm/filemap.c
index fb7a8d9b5603..2ca13227747b 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -43,6 +43,7 @@
 #include <linux/ramfs.h>
 #include <linux/page_idle.h>
 #include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
 #include "internal.h"
 
 #define CREATE_TRACE_POINTS
-- 
2.30.0.478.g8a0d178c01-goog