On Wed, May 23, 2018 at 04:28:23AM -0700, Matthew Wilcox wrote:

On Tue, May 22, 2018 at 09:18:17PM -0400, Kent Overstreet wrote:

quoted

@@ -2140,11 +2140,12 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
 	struct task_struct *task;
 	struct mm_struct *mm;
 	unsigned long nr_files, pos, i;
-	struct flex_array *fa = NULL;
-	struct map_files_info info;
+	GENRADIX(struct map_files_info) fa;
 	struct map_files_info *p;
 	int ret;
 
+	genradix_init(&fa);

Could we have a DEFINE_GENRADIX(type, name) which initialises the tree?

Already exists. I kind of prefer not to use it when I don't need to though, and
stick to things that look more like normal declarations instead.
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