Date: Tue, 06 Jan 2026 07:49:18 +0000 From: Enji Cooper <ngie@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Cc: Anagh Verma <go4av05.pvtx@gmail.com> Subject: git: f384784289db - main - kern_syscall_deregister: document syscall 0 no-op logic Message-ID: <695cbe7e.3daf1.20a5a762@gitrepo.freebsd.org>
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The branch main has been updated by ngie: URL: https://cgit.FreeBSD.org/src/commit/?id=f384784289dba13b90138a89d3df3a8ea063aff9 commit f384784289dba13b90138a89d3df3a8ea063aff9 Author: Anagh Verma <go4av05.pvtx@gmail.com> AuthorDate: 2026-01-06 07:42:56 +0000 Commit: Enji Cooper <ngie@FreeBSD.org> CommitDate: 2026-01-06 07:48:54 +0000 kern_syscall_deregister: document syscall 0 no-op logic Document syscall #0 being handled specially in `kern_syscall_deregister(..)`: it's a reserved syscall and not dynamically registered, and hence does not need to be deregistered in the function. Co-authored-by: ngie@ MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D54326 --- sys/kern/kern_syscalls.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/sys/kern/kern_syscalls.c b/sys/kern/kern_syscalls.c index a93d711e7597..7ddc28ed4e26 100644 --- a/sys/kern/kern_syscalls.c +++ b/sys/kern/kern_syscalls.c @@ -161,8 +161,14 @@ kern_syscall_deregister(struct sysent *sysents, int offset, { struct sysent *se; - if (offset == 0) - return (0); /* XXX? */ + if (offset == 0) { + /* + * Syscall #0 is reserved and is not dynamically registered. + * Treat deregistration as a no-op to simplify module unload + * paths. + */ + return (0); + } se = &sysents[offset]; if ((se->sy_thrcnt & SY_THR_STATIC) != 0)home | help
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