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ANDROID: dma-direct: Document disable_dma32

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Document the functionality of disable_dma32 as introduced in commit
c3c2bb34ac ("ANDROID: arm64/mm: Add command line option to make
ZONE_DMA32 empty").

Bug: 199917449
Signed-off-by: Chris Goldsworthy <quic_cgoldswo@quicinc.com>
Change-Id: I32ab2969f59fcc49e9ac49e7e6b545f816d120f9
This commit is contained in:
Chris Goldsworthy 2022-02-25 18:59:08 -08:00 • committed by Suren Baghdasaryan
commit 135406cecb
1 changed files with 4 additions and 0 deletions
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4
Documentation/admin-guide/kernel-parameters.txt
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@ -939,6 +939,10 @@
can be useful when debugging issues that require an SLB
miss to occur.
disable_dma32= [KNL]
Dynamically disable ZONE_DMA32 on kernels compiled with
CONFIG_ZONE_DMA32=y.
stress_slb [PPC]
Limits the number of kernel SLB entries, and flushes
them frequently to increase the rate of SLB faults