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Add missing M_NOWAIT flag

Description

Add missing M_NOWAIT flag

The LinuxKPI linux_dma code calls PCTRIE_INSERT with a
mutex held, but does not set M_NOWAIT when allocating
nodes, leading to a potential panic. All of this code
can handle an allocation failure here, so prefer an
allocation failure to sleeping on memory.

Also fix a related case where NOWAIT/WAITOK was not
specified. In this case it's not clear whether sleeping
is allowed so be conservative and assume not. There are
a lot of other paths in this code that can fail due to
a lack of memory anyway.

Differential Revision: https://reviews.freebsd.org/D22127
Reviewed by: imp
Sponsored by: Dell EMC Isilon
MFC After: 1 week

Details

Committed
rstoneOct 23 2019, 5:20 PM
Reviewer
imp
Differential Revision
D22127: Add missing M_NOWAIT flag
Parents
rS353937: Build toolchain components as dynamically linked executables by default
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