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Donenfeld" , Dinglan Peng , Pedro Fonseca , Jim Huang , Huichun Feng , Chih-En Lin Subject: [PATCH v3 12/14] fs/proc: Support COW PTE with clear_refs_write Date: Tue, 20 Dec 2022 15:27:41 +0800 Message-Id: <20221220072743.3039060-13-shiyn.lin@gmail.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221220072743.3039060-1-shiyn.lin@gmail.com> References: <20221220072743.3039060-1-shiyn.lin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 0AA1F8000F X-Stat-Signature: wb5tcacnygfissd96ztfn4pnk1aqzsc3 X-HE-Tag: 1671521207-309549 X-HE-Meta: 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 1uEGM7Zs V+0IaFNGoZ0EPoSlx0svn4GRPze7Ao5IO1HXsDOKPf7D7IF2puHmUUx7lzc7UhMMcjsdOwVzeACtDsCmrgfj1N8lADD/cC/miDTLCLAfDhxmgKegiwo96dsWyDV1rpo2P/+2oTtgj8LVUL8E1JS2VwrVS0utJZUXuEfZDb90yKri2h7KNca4GuBC2P1NyxxLJBnW7aGmsR+VQ8zN1nyhzp83mCHm1QPTfLrDllnOqDhh+yVFiZdXQmh+lv58EmY2C6xzkIMiXUE1YUEKHkiio2PGgxA== 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: Before clearing the entry in COW-ed PTE, break COW PTE first. Signed-off-by: Chih-En Lin --- fs/proc/task_mmu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 8a74cdcc9af00..7d34b036c1b96 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1190,6 +1190,9 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, if (pmd_trans_unstable(pmd)) return 0; + if (break_cow_pte(vma, pmd, addr) < 0) + return 0; + pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); for (; addr != end; pte++, addr += PAGE_SIZE) { ptent = *pte; -- 2.37.3