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hugetlb: fix hugepages= entry in kernel-parameters.txt

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The hugepages= entry in kernel-parameters.txt states that 1GB pages can
only be allocated at boot time and not freed afterwards.  This is not
true since commit 944d9fec8d ("hugetlb: add support for gigantic page
allocation at runtime"), at least for x86_64.

Instead of adding arch-specifc observations to the hugepages= entry,
this commit just drops the out of date information.  Further information
about arch-specific support and available features can be obtained in
the hugetlb documentation.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Luiz Capitulino 2014-12-12 16:55:18 -08:00 committed by Linus Torvalds
parent 6f185c290e
commit 27ec26ecdc
1 changed files with 1 additions and 3 deletions
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4
Documentation/kernel-parameters.txt
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@ -1228,9 +1228,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
multiple times interleaved with hugepages= to reserve multiple times interleaved with hugepages= to reserve
huge pages of different sizes. Valid pages sizes on huge pages of different sizes. Valid pages sizes on
x86-64 are 2M (when the CPU supports "pse") and 1G x86-64 are 2M (when the CPU supports "pse") and 1G
(when the CPU supports the "pdpe1gb" cpuinfo flag) (when the CPU supports the "pdpe1gb" cpuinfo flag).
Note that 1GB pages can only be allocated at boot time
using hugepages= and not freed afterwards.
hvc_iucv= [S390] Number of z/VM IUCV hypervisor console (HVC) hvc_iucv= [S390] Number of z/VM IUCV hypervisor console (HVC)
terminal devices. Valid values: 0..8 terminal devices. Valid values: 0..8