Diffusion FreeBSD src repository 290b0d123ae2

x86: use x86_clear_dbregs() on fork
290b0d123ae2
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Description

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

Details

Provenance

kib	Authored on Apr 9 2021, 11:20 PM

Reviewer

jhb

Differential Revision

D29687: x86: add x86_clear_dbregs() and ensure all ABI exec set_regs method clear debug registers file

Parents

rGa8b75a57c9b2: x86: add x86_clear_dbregs() helper

Branches

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Tags

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Event Timeline

kib committed rG290b0d123ae2: x86: use x86_clear_dbregs() on fork (authored by kib).Apr 10 2021, 1:25 AM

kib added an edge: D29687: x86: add x86_clear_dbregs() and ensure all ABI exec set_regs method clear debug registers file.

kib mentioned this in rGf06f6654303a: x86: use x86_clear_dbregs() on fork.Apr 23 2021, 11:17 AM

kib mentioned this in rG71add7877a02: x86: use x86_clear_dbregs() on fork.May 1 2021, 12:39 AM

Changes (2)

Path

Size

sys/

amd64/

vm_machdep.c

i386/

vm_machdep.c

rG290b0d123ae2

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sys/amd64/amd64/vm_machdep.c