asm-generic: fix a compilation warning

Fix this compilation warning on x86 by making flush_cache_vmap() inline.

  lib/ioremap.c: In function 'ioremap_page_range':
  lib/ioremap.c:214:16: warning: variable 'start' set but not used [-Wunused-but-set-variable]
    unsigned long start;
                  ^~~~~

While at it, convert all other similar functions to inline for
consistency.

Link: http://lkml.kernel.org/r/1562594592-15228-1-git-send-email-cai@lca.pw
Signed-off-by: Qian Cai <cai@lca.pw>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/asm-generic/cacheflush.h

@@ -5,24 +5,70 @@
 /* Keep includes the same across arches.  */
 #include <linux/mm.h>
 
+#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
+
 /*
  * The cache doesn't need to be flushed when TLB entries change when
  * the cache is mapped to physical memory, not virtual memory
  */
-#define flush_cache_all()			do { } while (0)
+static inline void flush_cache_all(void)
-#define flush_cache_mm(mm)			do { } while (0)
+{
-#define flush_cache_dup_mm(mm)			do { } while (0)
+}
-#define flush_cache_range(vma, start, end)	do { } while (0)
+
-#define flush_cache_page(vma, vmaddr, pfn)	do { } while (0)
+static inline void flush_cache_mm(struct mm_struct *mm)
-#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
+{
-#define flush_dcache_page(page)			do { } while (0)
+}
-#define flush_dcache_mmap_lock(mapping)		do { } while (0)
+
-#define flush_dcache_mmap_unlock(mapping)	do { } while (0)
+static inline void flush_cache_dup_mm(struct mm_struct *mm)
-#define flush_icache_range(start, end)		do { } while (0)
+{
-#define flush_icache_page(vma,pg)		do { } while (0)
+}
-#define flush_icache_user_range(vma,pg,adr,len)	do { } while (0)
+
-#define flush_cache_vmap(start, end)		do { } while (0)
+static inline void flush_cache_range(struct vm_area_struct *vma,
-#define flush_cache_vunmap(start, end)		do { } while (0)
+				     unsigned long start,
+				     unsigned long end)
+{
+}
+
+static inline void flush_cache_page(struct vm_area_struct *vma,
+				    unsigned long vmaddr,
+				    unsigned long pfn)
+{
+}
+
+static inline void flush_dcache_page(struct page *page)
+{
+}
+
+static inline void flush_dcache_mmap_lock(struct address_space *mapping)
+{
+}
+
+static inline void flush_dcache_mmap_unlock(struct address_space *mapping)
+{
+}
+
+static inline void flush_icache_range(unsigned long start, unsigned long end)
+{
+}
+
+static inline void flush_icache_page(struct vm_area_struct *vma,
+				     struct page *page)
+{
+}
+
+static inline void flush_icache_user_range(struct vm_area_struct *vma,
+					   struct page *page,
+					   unsigned long addr, int len)
+{
+}
+
+static inline void flush_cache_vmap(unsigned long start, unsigned long end)
+{
+}
+
+static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
+{
+}
 
 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
 	do { \