linux-kernel - [RFC PATCH v2 27/51] mm: hugetlb: Expose hugetlb_subpool_{get,put}

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <779107f1ff8c79095ca0b2d7921e4c54e20861ad.1747264138.git.ackerleytng@google.com>
Date: Wed, 14 May 2025 16:42:06 -0700
From: Ackerley Tng <ackerleytng@...gle.com>
To: kvm@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	x86@...nel.org, linux-fsdevel@...r.kernel.org
Cc: ackerleytng@...gle.com, aik@....com, ajones@...tanamicro.com, 
	akpm@...ux-foundation.org, amoorthy@...gle.com, anthony.yznaga@...cle.com, 
	anup@...infault.org, aou@...s.berkeley.edu, bfoster@...hat.com, 
	binbin.wu@...ux.intel.com, brauner@...nel.org, catalin.marinas@....com, 
	chao.p.peng@...el.com, chenhuacai@...nel.org, dave.hansen@...el.com, 
	david@...hat.com, dmatlack@...gle.com, dwmw@...zon.co.uk, 
	erdemaktas@...gle.com, fan.du@...el.com, fvdl@...gle.com, graf@...zon.com, 
	haibo1.xu@...el.com, hch@...radead.org, hughd@...gle.com, ira.weiny@...el.com, 
	isaku.yamahata@...el.com, jack@...e.cz, james.morse@....com, 
	jarkko@...nel.org, jgg@...pe.ca, jgowans@...zon.com, jhubbard@...dia.com, 
	jroedel@...e.de, jthoughton@...gle.com, jun.miao@...el.com, 
	kai.huang@...el.com, keirf@...gle.com, kent.overstreet@...ux.dev, 
	kirill.shutemov@...el.com, liam.merwick@...cle.com, 
	maciej.wieczor-retman@...el.com, mail@...iej.szmigiero.name, maz@...nel.org, 
	mic@...ikod.net, michael.roth@....com, mpe@...erman.id.au, 
	muchun.song@...ux.dev, nikunj@....com, nsaenz@...zon.es, 
	oliver.upton@...ux.dev, palmer@...belt.com, pankaj.gupta@....com, 
	paul.walmsley@...ive.com, pbonzini@...hat.com, pdurrant@...zon.co.uk, 
	peterx@...hat.com, pgonda@...gle.com, pvorel@...e.cz, qperret@...gle.com, 
	quic_cvanscha@...cinc.com, quic_eberman@...cinc.com, 
	quic_mnalajal@...cinc.com, quic_pderrin@...cinc.com, quic_pheragu@...cinc.com, 
	quic_svaddagi@...cinc.com, quic_tsoni@...cinc.com, richard.weiyang@...il.com, 
	rick.p.edgecombe@...el.com, rientjes@...gle.com, roypat@...zon.co.uk, 
	rppt@...nel.org, seanjc@...gle.com, shuah@...nel.org, steven.price@....com, 
	steven.sistare@...cle.com, suzuki.poulose@....com, tabba@...gle.com, 
	thomas.lendacky@....com, usama.arif@...edance.com, vannapurve@...gle.com, 
	vbabka@...e.cz, viro@...iv.linux.org.uk, vkuznets@...hat.com, 
	wei.w.wang@...el.com, will@...nel.org, willy@...radead.org, 
	xiaoyao.li@...el.com, yan.y.zhao@...el.com, yilun.xu@...el.com, 
	yuzenghui@...wei.com, zhiquan1.li@...el.com
Subject: [RFC PATCH v2 27/51] mm: hugetlb: Expose hugetlb_subpool_{get,put}_pages()

This will allow hugetlb subpools to be used by guestmem_hugetlb.

Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
Change-Id: I909355935f2ab342e65e7bfdc106bedd1dc177c9
---
 include/linux/hugetlb.h | 3 +++
 mm/hugetlb.c            | 6 ++----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index c59264391c33..e6b90e72d46d 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -119,6 +119,9 @@ struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
 					      long min_hpages, bool use_surplus);
 void hugepage_put_subpool(struct hugepage_subpool *spool);
 
+long hugepage_subpool_get_pages(struct hugepage_subpool *spool, long delta);
+long hugepage_subpool_put_pages(struct hugepage_subpool *spool, long delta);
+
 void hugetlb_dup_vma_private(struct vm_area_struct *vma);
 void clear_vma_resv_huge_pages(struct vm_area_struct *vma);
 int move_hugetlb_page_tables(struct vm_area_struct *vma,
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index d22c5a8fd441..816f257680be 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -205,8 +205,7 @@ void hugepage_put_subpool(struct hugepage_subpool *spool)
  * only be different than the passed value (delta) in the case where
  * a subpool minimum size must be maintained.
  */
-static long hugepage_subpool_get_pages(struct hugepage_subpool *spool,
-				      long delta)
+long hugepage_subpool_get_pages(struct hugepage_subpool *spool, long delta)
 {
 	long ret = delta;
 
@@ -250,8 +249,7 @@ static long hugepage_subpool_get_pages(struct hugepage_subpool *spool,
  * The return value may only be different than the passed value (delta)
  * in the case where a subpool minimum size must be maintained.
  */
-static long hugepage_subpool_put_pages(struct hugepage_subpool *spool,
-				       long delta)
+long hugepage_subpool_put_pages(struct hugepage_subpool *spool, long delta)
 {
 	long ret = delta;
 	unsigned long flags;
-- 
2.49.0.1045.g170613ef41-goog