linux-kernel - [RFC PATCH RESEND 08/28] mm/khugepaged: mark VMA as locked while collapsing a hugepage

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Message-ID: <20220901173516.702122-9-surenb@google.com>
Date:   Thu,  1 Sep 2022 10:34:56 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     akpm@...ux-foundation.org
Cc:     michel@...pinasse.org, jglisse@...gle.com, mhocko@...e.com,
        vbabka@...e.cz, hannes@...xchg.org, mgorman@...e.de,
        dave@...olabs.net, willy@...radead.org, liam.howlett@...cle.com,
        peterz@...radead.org, ldufour@...ux.ibm.com,
        laurent.dufour@...ibm.com, paulmck@...nel.org, luto@...nel.org,
        songliubraving@...com, peterx@...hat.com, david@...hat.com,
        dhowells@...hat.com, hughd@...gle.com, bigeasy@...utronix.de,
        kent.overstreet@...ux.dev, rientjes@...gle.com,
        axelrasmussen@...gle.com, joelaf@...gle.com, minchan@...gle.com,
        surenb@...gle.com, kernel-team@...roid.com, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH RESEND 08/28] mm/khugepaged: mark VMA as locked while
 collapsing a hugepage

Protect VMA from concurrent page fault handler while modifying it in
collapse_huge_page.

Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
---
 mm/khugepaged.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 01f71786d530..030680633989 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1072,6 +1072,7 @@ static void collapse_huge_page(struct mm_struct *mm,
 	if (mm_find_pmd(mm, address) != pmd)
 		goto out_up_write;
 
+	vma_mark_locked(vma);
 	anon_vma_lock_write(vma->anon_vma);
 
 	mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL, mm,
-- 
2.37.2.789.g6183377224-goog