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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-04 09:39:26 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-04 09:39:26 -0700 |
| commit | cb3e4330e697dffaf3d9cefebc9c7e7d39c89f2e (patch) | |
| tree | f5c425230cfce61ddcea0f6c508e345737766022 /Documentation | |
| parent | aafcd5d75797ac423f6a03ce1f801933d4b114dc (diff) | |
| parent | 30e46b574a1db7d14404e52dca8e1aa5f5155fd2 (diff) | |
Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 mm changes from Ingo Molnar:
"Misc smaller fixes:
- a parse_setup_data() boot crash fix
- a memblock and an __early_ioremap cleanup
- turn the always-on CONFIG_ARCH_MEMORY_PROBE=y into a configurable
option and turn it off - it's an unrobust debug facility, it
shouldn't be enabled by default"
* 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86: avoid remapping data in parse_setup_data()
x86: Use memblock_set_current_limit() to set limit for memblock.
mm: Remove unused variable idx0 in __early_ioremap()
mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/memory-hotplug.txt | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/Documentation/memory-hotplug.txt b/Documentation/memory-hotplug.txt index 8e5eacbdcfa..8fd254c7358 100644 --- a/Documentation/memory-hotplug.txt +++ b/Documentation/memory-hotplug.txt @@ -210,13 +210,15 @@ If memory device is found, memory hotplug code will be called. 4.2 Notify memory hot-add event by hand ------------ -In some environments, especially virtualized environment, firmware will not -notify memory hotplug event to the kernel. For such environment, "probe" -interface is supported. This interface depends on CONFIG_ARCH_MEMORY_PROBE. - -Now, CONFIG_ARCH_MEMORY_PROBE is supported only by powerpc but it does not -contain highly architecture codes. Please add config if you need "probe" -interface. +On powerpc, the firmware does not notify a memory hotplug event to the kernel. +Therefore, "probe" interface is supported to notify the event to the kernel. +This interface depends on CONFIG_ARCH_MEMORY_PROBE. + +CONFIG_ARCH_MEMORY_PROBE is supported on powerpc only. On x86, this config +option is disabled by default since ACPI notifies a memory hotplug event to +the kernel, which performs its hotplug operation as the result. Please +enable this option if you need the "probe" interface for testing purposes +on x86. Probe interface is located at /sys/devices/system/memory/probe |