From owner-dev-commits-src-main@freebsd.org Sat Apr 10 01:25:12 2021 Return-Path: Delivered-To: dev-commits-src-main@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 4AC285C64C2; Sat, 10 Apr 2021 01:25:12 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FHHP41N6sz4rpB; Sat, 10 Apr 2021 01:25:12 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 20AE3468; Sat, 10 Apr 2021 01:25:12 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 13A1PC39043277; Sat, 10 Apr 2021 01:25:12 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 13A1PCii043276; Sat, 10 Apr 2021 01:25:12 GMT (envelope-from git) Date: Sat, 10 Apr 2021 01:25:12 GMT Message-Id: <202104100125.13A1PCii043276@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Konstantin Belousov Subject: git: 290b0d123ae2 - main - x86: use x86_clear_dbregs() on fork MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kib X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 290b0d123ae2136ad84b268cd1884b1624d1d37f Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-main@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for the main branch of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 10 Apr 2021 01:25:12 -0000 The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=290b0d123ae2136ad84b268cd1884b1624d1d37f commit 290b0d123ae2136ad84b268cd1884b1624d1d37f Author: Konstantin Belousov AuthorDate: 2021-04-09 23:20:55 +0000 Commit: Konstantin Belousov CommitDate: 2021-04-10 01:25:02 +0000 x86: use x86_clear_dbregs() on fork instead of manual zeroing of the debug registers file in pcb. This centralizes the cleaning code, but the practical difference is that PCB_DBREGS flag is cleared, saving some operations on context switching. Reviewed by: jhb Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D29687 --- sys/amd64/amd64/vm_machdep.c | 7 +------ sys/i386/i386/vm_machdep.c | 7 +------ 2 files changed, 2 insertions(+), 12 deletions(-) diff --git a/sys/amd64/amd64/vm_machdep.c b/sys/amd64/amd64/vm_machdep.c index 98d212dc8771..1acc5dc55c85 100644 --- a/sys/amd64/amd64/vm_machdep.c +++ b/sys/amd64/amd64/vm_machdep.c @@ -230,12 +230,7 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) copy_thread(td1, td2); /* Reset debug registers in the new process */ - pcb2->pcb_dr0 = 0; - pcb2->pcb_dr1 = 0; - pcb2->pcb_dr2 = 0; - pcb2->pcb_dr3 = 0; - pcb2->pcb_dr6 = 0; - pcb2->pcb_dr7 = 0; + x86_clear_dbregs(pcb2); /* Point mdproc and then copy over p1's contents */ mdp2 = &p2->p_md; diff --git a/sys/i386/i386/vm_machdep.c b/sys/i386/i386/vm_machdep.c index ed40ebe5d1c8..57377575b9bf 100644 --- a/sys/i386/i386/vm_machdep.c +++ b/sys/i386/i386/vm_machdep.c @@ -242,12 +242,7 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) copy_thread(td1, td2); /* Reset debug registers in the new process */ - pcb2->pcb_dr0 = 0; - pcb2->pcb_dr1 = 0; - pcb2->pcb_dr2 = 0; - pcb2->pcb_dr3 = 0; - pcb2->pcb_dr6 = 0; - pcb2->pcb_dr7 = 0; + x86_clear_dbregs(pcb2); /* Point mdproc and then copy over td1's contents */ mdp2 = &p2->p_md;