linux-kernel - [PATCH][next] mm/memremap: Replace zero-length array with DECLARE_FLEX

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Message-ID: <YxKO/jY1x0xTpl4r@work>
Date:   Sat, 3 Sep 2022 00:17:18 +0100
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Cc: linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org, ;
Subject: [PATCH][next] 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
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 include/linux/memremap.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index c3b4cc84877b..ad3c38840194 100644
--- 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);
 	};
 };
 
-- 
2.34.1