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resource: Set type of "reserve=" user-specified resources

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When we reserve regions because the user specified a "reserve=" parameter,
set the resource type to either IORESOURCE_IO (for regions below 0x10000)
or IORESOURCE_MEM.  The test for 0x10000 is just a heuristic; obviously
there can be memory below 0x10000 as well.

Improve documentation of the "reserve=" parameter.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2017-12-01 11:50:33 -06:00
parent 6a9d42ed0d
commit ffd2e8df8d
2 changed files with 23 additions and 7 deletions
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6
Documentation/admin-guide/kernel-parameters.txt
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@ -3675,7 +3675,11 @@
[KNL, SMP] Set scheduler's default relax_domain_level.
See Documentation/cgroup-v1/cpusets.txt.
reserve= [KNL,BUGS] Force the kernel to ignore some iomem area
reserve= [KNL,BUGS] Force kernel to ignore I/O ports or memory
Format: <base1>,<size1>[,<base2>,<size2>,...]
Reserve I/O ports or memory so the kernel won't use
them. If <base> is less than 0x10000, the region
is assumed to be I/O ports; otherwise it is memory.
reservetop= [X86-32]
Format: nn[KMG]