mm/memremap: Replace zero-length array with DECLARE_FLEX_ARRAY() helper

Zero-length arrays are deprecated and we are moving towards adopting
C99 flexible-array members, instead. So, replace zero-length array
declaration in struct dev_pagemap with the new DECLARE_FLEX_ARRAY()
helper macro.

This helper allows for a flexible-array member in a union.

Also, this addresses multiple warnings reported when building
with Clang-15 and -Wzero-length-array.

Link: https://github.com/KSPP/linux/issues/193
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index 7fcaf31..1314d9c 100644 (file)
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -135,7 +135,7 @@ struct dev_pagemap {
        int nr_range;
        union {
                struct range range;
-               struct range ranges[0];
+               DECLARE_FLEX_ARRAY(struct range, ranges);
        };
 };