Date: Mon, 15 Jul 2024 12:38:35 GMT From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 066069197864 - stable/13 - cdefs: Add __writeonly to mark write only vars Message-ID: <202407151238.46FCcZcB062105@gitrepo.freebsd.org>
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The branch stable/13 has been updated by andrew: URL: https://cgit.FreeBSD.org/src/commit/?id=06606919786416d9854a16ad856ed89582856f16 commit 06606919786416d9854a16ad856ed89582856f16 Author: Andrew Turner <andrew@FreeBSD.org> AuthorDate: 2024-06-12 13:04:13 +0000 Commit: Andrew Turner <andrew@FreeBSD.org> CommitDate: 2024-07-15 12:35:21 +0000 cdefs: Add __writeonly to mark write only vars When a variable in write only and can't be removed, e.g. for API reasons, it is useful to document this fact similar to __diagused and __witness_used. Add __writeonly to tell the compiler and anyone looking at the code that this variable is expected to only be written to, and to not raise and error. Reviewed by: imp, kib Sponsored by: Arm Ltd Differential Revision: https://reviews.freebsd.org/D45561 (cherry picked from commit a7ae78caaa17ff840da844c1dcaa780d194c9e20) --- sys/sys/cdefs.h | 1 + 1 file changed, 1 insertion(+) diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h index df15a3c04193..d9e1c476f1ef 100644 --- a/sys/sys/cdefs.h +++ b/sys/sys/cdefs.h @@ -219,6 +219,7 @@ #define __aligned(x) __attribute__((__aligned__(x))) #define __section(x) __attribute__((__section__(x))) #endif +#define __writeonly __unused #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__) #define __alloc_size(x) __attribute__((__alloc_size__(x))) #define __alloc_size2(n, x) __attribute__((__alloc_size__(n, x)))
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