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Subject[PATCH 1/3] hugetlb: fix hugepages= entry in kernel-parameters.txt
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
944d9fec8d7aee, 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hugepages= entry, this commit just drops the out of date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 <>
Documentation/kernel-parameters.txt | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 479f332..d919af0 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1228,9 +1228,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
multiple times interleaved with hugepages= to reserve
huge pages of different sizes. Valid pages sizes on
x86-64 are 2M (when the CPU supports "pse") and 1G
- (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.
+ (when the CPU supports the "pdpe1gb" cpuinfo flag).

hvc_iucv= [S390] Number of z/VM IUCV hypervisor console (HVC)
terminal devices. Valid values: 0..8

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