linux-kernel - [PATCH 1/4] radix tree test suite: Add support for fallthrough attribute

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Message-ID: <20210512184850.3526677-1-Liam.Howlett@Oracle.com>
Date:   Wed, 12 May 2021 18:48:52 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>
CC:     Liam Howlett <liam.howlett@...cle.com>
Subject: [PATCH 1/4] radix tree test suite: Add support for fallthrough
 attribute

Add support for fallthrough on case statements.  Note this does *NOT*
check for missing fallthrough, but does allow compiling of code with
fallthrough in case statements.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 tools/testing/radix-tree/linux/kernel.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/radix-tree/linux/kernel.h b/tools/testing/radix-tree/linux/kernel.h
index 39867fd80c8f..c400a27e544a 100644
--- a/tools/testing/radix-tree/linux/kernel.h
+++ b/tools/testing/radix-tree/linux/kernel.h
@@ -23,4 +23,11 @@
 #define __must_hold(x)
 
 #define EXPORT_PER_CPU_SYMBOL_GPL(x)
+
+#if __has_attribute(__fallthrough__)
+# define fallthrough                    __attribute__((__fallthrough__))
+#else
+# define fallthrough                    do {} while (0)  /* fallthrough */
+#endif /* __has_attribute */
+
 #endif /* _KERNEL_H */
-- 
2.30.2