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bring the section on automatic acquisition of kernel_lock up-to-date

This commit is contained in:
jdolecek 2020-04-07 07:25:09 +00:00
parent 0edf09d843
commit 1243d69abd
1 changed files with 9 additions and 6 deletions
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15
share/man/man9/spl.9
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@ -1,4 +1,4 @@
.\" $NetBSD: spl.9,v 1.41 2017/04/06 03:00:13 pgoyette Exp $
.\" $NetBSD: spl.9,v 1.42 2020/04/07 07:25:09 jdolecek Exp $
.\"
.\" Copyright (c) 2000, 2001 Jason R. Thorpe. All rights reserved.
.\" Copyright (c) 1997 Michael Long.
@ -27,7 +27,7 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd April 6, 2017
.Dd April 7, 2020
.Dt SPL 9
.Os
.Sh NAME
@ -169,14 +169,17 @@ or endorsed
.Xr pool_cache 9
interfaces to allocate memory.
.Pp
At the time of writing, the global
The global
.Dv kernel_lock
is automatically acquired for interrupts at this level, in order to
is automatically acquired for interrupts at this level by default,
in order to
support device drivers that do not provide their own multiprocessor
synchronization.
A future release of the system may allow the automatic acquisition of
The automatic acquisition of
.Dv kernel_lock
to be disabled for individual interrupt handlers.
can be disabled for individual interrupt handlers by device drivers
if supported by subsystem, see e.g.
.Xr pci_intr_establish 9 .
.Pp
.Fn splbio ,
.Fn splnet ,