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As of the Linux 5.9 kernel a fallthrough macro has been added which should be used to anotate all intentional fallthrough paths. Once all of the kernel code paths have been updated to use fallthrough the -Wimplicit-fallthrough option will because the default. To avoid warnings in the OpenZFS code base when this happens apply the fallthrough macro. Additional reading: https://lwn.net/Articles/794944/ Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #12441
44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (C) 2018 Lawrence Livermore National Security, LLC.
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*/
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#ifndef _ZFS_COMPILER_COMPAT_H
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#define _ZFS_COMPILER_COMPAT_H
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#include <linux/compiler.h>
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#if !defined(fallthrough)
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#if defined(HAVE_IMPLICIT_FALLTHROUGH)
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#define fallthrough __attribute__((__fallthrough__))
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#else
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#define fallthrough ((void)0)
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#endif
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#endif
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#if !defined(READ_ONCE)
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#define READ_ONCE(x) ACCESS_ONCE(x)
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#endif
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#endif /* _ZFS_COMPILER_COMPAT_H */
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