binfmt_flat: use flush_icache_user_range

load_flat_file works on user addresses.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Greg Ungerer <gerg@linux-m68k.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Link: http://lkml.kernel.org/r/20200515143646.3857579-28-hch@lst.deSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/binfmt_flat.c

@@ -854,7 +854,7 @@ static int load_flat_file(struct linux_binprm *bprm,
 #endif /* CONFIG_BINFMT_FLAT_OLD */
 	}
 
-	flush_icache_range(start_code, end_code);
+	flush_icache_user_range(start_code, end_code);
 
 	/* zero the BSS,  BRK and stack areas */
 	if (clear_user((void __user *)(datapos + data_len), bss_len +