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From: Luiz Capitulino <lcapitulino@redhat.com>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
	andi@firstfloor.org, rientjes@google.com, riel@redhat.com,
	isimatu.yasuaki@jp.fujitsu.com, yinghai@kernel.org,
	davidlohr@hp.com
Subject: [PATCH 1/3] hugetlb: fix hugepages= entry in kernel-parameters.txt
Date: Wed, 12 Nov 2014 17:33:11 -0500	[thread overview]
Message-ID: <1415831593-9020-2-git-send-email-lcapitulino@redhat.com> (raw)
In-Reply-To: <1415831593-9020-1-git-send-email-lcapitulino@redhat.com>

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hugepages= entry, this commit just drops the out of date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 <lcapitulino@redhat.com>
---
 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
-- 
1.9.3

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  reply	other threads:[~2014-11-12 22:33 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-12 22:33 [PATCH 0/3] hugetlb: misc small fixes/improvements Luiz Capitulino
2014-11-12 22:33 ` Luiz Capitulino [this message]
2014-11-17  0:11   ` [PATCH 1/3] hugetlb: fix hugepages= entry in kernel-parameters.txt Naoya Horiguchi
2014-11-19 22:39   ` David Rientjes
2014-11-12 22:33 ` [PATCH 2/3] hugetlb: alloc_bootmem_huge_page(): use IS_ALIGNED() Luiz Capitulino
2014-11-17  0:11   ` Naoya Horiguchi
2014-11-19 22:42   ` David Rientjes
2014-11-12 22:33 ` [PATCH 3/3] hugetlb: hugetlb_register_all_nodes(): add __init marker Luiz Capitulino
2014-11-17  0:12   ` Naoya Horiguchi
2014-11-19 22:43   ` David Rientjes

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