linux-kernel - [RFC PATCH 03/12] khugepaged: Generalize hugepage_vma

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: <20241216165105.56185-4-dev.jain@arm.com>
Date: Mon, 16 Dec 2024 22:20:56 +0530
From: Dev Jain <dev.jain@....com>
To: akpm@...ux-foundation.org,
	david@...hat.com,
	willy@...radead.org,
	kirill.shutemov@...ux.intel.com
Cc: ryan.roberts@....com,
	anshuman.khandual@....com,
	catalin.marinas@....com,
	cl@...two.org,
	vbabka@...e.cz,
	mhocko@...e.com,
	apopple@...dia.com,
	dave.hansen@...ux.intel.com,
	will@...nel.org,
	baohua@...nel.org,
	jack@...e.cz,
	srivatsa@...il.mit.edu,
	haowenchao22@...il.com,
	hughd@...gle.com,
	aneesh.kumar@...nel.org,
	yang@...amperecomputing.com,
	peterx@...hat.com,
	ioworker0@...il.com,
	wangkefeng.wang@...wei.com,
	ziy@...dia.com,
	jglisse@...gle.com,
	surenb@...gle.com,
	vishal.moola@...il.com,
	zokeefe@...gle.com,
	zhengqi.arch@...edance.com,
	jhubbard@...dia.com,
	21cnbao@...il.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Dev Jain <dev.jain@....com>
Subject: [RFC PATCH 03/12] khugepaged: Generalize hugepage_vma_revalidate()

Post retaking the lock, it must be checked that the VMA is suitable for our
scan order. Hence, generalize hugepage_vma_revalidate().

Signed-off-by: Dev Jain <dev.jain@....com>
---
 mm/khugepaged.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 02cd424b8e48..2f0601795471 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -918,7 +918,7 @@ static int hpage_collapse_find_target_node(struct collapse_control *cc)
 
 static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
 				   bool expect_anon,
-				   struct vm_area_struct **vmap,
+				   struct vm_area_struct **vmap, int order,
 				   struct collapse_control *cc)
 {
 	struct vm_area_struct *vma;
@@ -931,9 +931,9 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
 	if (!vma)
 		return SCAN_VMA_NULL;
 
-	if (!thp_vma_suitable_order(vma, address, PMD_ORDER))
+	if (!thp_vma_suitable_order(vma, address, order))
 		return SCAN_ADDRESS_RANGE;
-	if (!thp_vma_allowable_order(vma, vma->vm_flags, tva_flags, PMD_ORDER))
+	if (!thp_vma_allowable_order(vma, vma->vm_flags, tva_flags, order))
 		return SCAN_VMA_CHECK;
 	/*
 	 * Anon VMA expected, the address may be unmapped then
@@ -1134,7 +1134,7 @@ static int collapse_huge_page(struct mm_struct *mm, unsigned long address,
 		goto out_nolock;
 
 	mmap_read_lock(mm);
-	result = hugepage_vma_revalidate(mm, address, true, &vma, cc);
+	result = hugepage_vma_revalidate(mm, address, true, &vma, order, cc);
 	if (result != SCAN_SUCCEED) {
 		mmap_read_unlock(mm);
 		goto out_nolock;
@@ -1168,7 +1168,7 @@ static int collapse_huge_page(struct mm_struct *mm, unsigned long address,
 	 * mmap_lock.
 	 */
 	mmap_write_lock(mm);
-	result = hugepage_vma_revalidate(mm, address, true, &vma, cc);
+	result = hugepage_vma_revalidate(mm, address, true, &vma, order, cc);
 	if (result != SCAN_SUCCEED)
 		goto out_up_write;
 	/* check if the pmd is still valid */
@@ -2776,7 +2776,7 @@ int madvise_collapse(struct vm_area_struct *vma, struct vm_area_struct **prev,
 			mmap_read_lock(mm);
 			mmap_locked = true;
 			result = hugepage_vma_revalidate(mm, addr, false, &vma,
-							 cc);
+							 HPAGE_PMD_ORDER, cc);
 			if (result  != SCAN_SUCCEED) {
 				last_fail = result;
 				goto out_nolock;
-- 
2.30.2