Message ID | 20240904084022.32728-6-zhengqi.arch@bytedance.com (mailing list archive) |
---|---|
State | New |
Headers | show
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AJvYcCX1H8vh64KG53oozztLWXjJZGdSk8amFmftPhdJzSuFOHVoOZ9Yb0avgye5IGzuGvWaa0cxRikz6g==@kvack.org X-Gm-Message-State: AOJu0YyZdz5XBLDBwbyRl9/e7XTKFcTQestAHpFKQt2uQ90+R5fYXPI2 brT7XBEGCognxBynPcZOW5Pjur/v3DkJMi6Gj6EfdjiJmFuxFXUBUjwuPbucIaw= X-Google-Smtp-Source: AGHT+IEy+qEnEqpj3sReiKH3tPFUkwjqR7spuVkWXeQJodyHWsfCM0cenE/z+pCdCppofQTZA+ekKQ== X-Received: by 2002:a17:903:283:b0:205:76c1:3742 with SMTP id d9443c01a7336-206b7d00d3amr22901025ad.3.1725439276249; Wed, 04 Sep 2024 01:41:16 -0700 (PDT) Received: from C02DW0BEMD6R.bytedance.net ([139.177.225.242]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-206ae95a51csm9414045ad.117.2024.09.04.01.41.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Sep 2024 01:41:15 -0700 (PDT) From: Qi Zheng <zhengqi.arch@bytedance.com> To: david@redhat.com, hughd@google.com, willy@infradead.org, muchun.song@linux.dev, vbabka@kernel.org, akpm@linux-foundation.org, rppt@kernel.org, vishal.moola@gmail.com, peterx@redhat.com, ryan.roberts@arm.com, christophe.leroy2@cs-soprasteria.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, Qi Zheng <zhengqi.arch@bytedance.com> Subject: [PATCH v3 05/14] mm: khugepaged: __collapse_huge_page_swapin() use pte_offset_map_ro_nolock() Date: Wed, 4 Sep 2024 16:40:13 +0800 Message-Id: <20240904084022.32728-6-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20240904084022.32728-1-zhengqi.arch@bytedance.com> References: <20240904084022.32728-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 99FF8C0008 X-Stat-Signature: gua8skenxswxuts6mw6cahhe5b9rm6zf X-Rspam-User: X-HE-Tag: 1725439277-294836 X-HE-Meta: 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 R2fEQVcC ak6JUVCkpA74Mrw86JDkZA5KIlL+fFnEqYUCyuncy3fJTXmnutctDL0OowQ1kKqrvg/k4qpZBN5nwHGyBrWpZ/PIzFLbr6/rcru6GXD0lLcjBEABev3D/I1EBJhAClQRdWTNs5Jzv8O0ve4SBuuaqYxNNgjfbbswOPFb+/kpMqrW9+BMHcOcixBRpuB1IC4TyJkwMhHGPRQsjc7WhpJ+Adzb86sxbeqCgWzRXnNTnG5TsnCrFAdTqPewo2lnV/c/hGvR+jrZKYqP7I2aAHx46NNErizw9zuof/hUSWg7ByInZmzyuWPLxmmkemhyVY65IsVnmxCXLvgKmp0LzBWBvLGTZZzzVo4UQpD3nDOq0ywhsdzh3rts6LMxkNDsHgopu3RMC2lnj9mhG2QFZke0qz40fmQ5UILWdU4hM+4VIKUqRdcH3Cj/tZKY+Dyhb8HffybHz/TMV4wq1pPY= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> List-Subscribe: <mailto:majordomo@kvack.org> List-Unsubscribe: <mailto:majordomo@kvack.org> |
Series |
introduce pte_offset_map_{ro|rw}_nolock()
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expand
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diff --git a/mm/khugepaged.c b/mm/khugepaged.c index f9c39898eaff6..6498721d4783a 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1011,7 +1011,11 @@ static int __collapse_huge_page_swapin(struct mm_struct *mm, }; if (!pte++) { - pte = pte_offset_map_nolock(mm, pmd, address, &ptl); + /* + * Here the ptl is only used to check pte_same() in + * do_swap_page(), so readonly version is enough. + */ + pte = pte_offset_map_ro_nolock(mm, pmd, address, &ptl); if (!pte) { mmap_read_unlock(mm); result = SCAN_PMD_NULL;