The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=290b0d123ae2136ad84b268cd1884b1624d1d37f
commit 290b0d123ae2136ad84b268cd1884b1624d1d37f Author: Konstantin Belousov <[email protected]> AuthorDate: 2021-04-09 23:20:55 +0000 Commit: Konstantin Belousov <[email protected]> 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; _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/dev-commits-src-main To unsubscribe, send any mail to "[email protected]"
