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Thu, 26 Mar 2026 16:47:57 +0800 From: Chenghao Duan To: pasha.tatashin@soleen.com, rppt@kernel.org, pratyush@kernel.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: jianghaoran@kylinos.cn, duanchenghao@kylinos.cn Subject: [PATCH v3 3/7] mm/memfd_luo: remove unnecessary memset in zero-size memfd path Date: Thu, 26 Mar 2026 16:47:23 +0800 Message-Id: <20260326084727.118437-4-duanchenghao@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260326084727.118437-1-duanchenghao@kylinos.cn> References: <20260326084727.118437-1-duanchenghao@kylinos.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 098F91C0003 X-Stat-Signature: po31ag9wx6od1yren1p57p3fye78omgo X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1774514884-239649 X-HE-Meta: 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 nmMWwMaw Wf3uVAuwU+eK6mf6wN7EQ1fCND7YI51uv8PyEInY9b7Tykl5KFGq9yVsLFEcK64u3w/+GQziMAdOd/oW5SG7BixDXmU/W1+H+wAmg7JmJbngWwtrl7cNDMZvFSa8xY7OqlAJ9QJaPKdt2OHBkVXthOqiW4ddizGc54t/oOKW0Qnp2aDU= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The memset(kho_vmalloc, 0, sizeof(*kho_vmalloc)) call in the zero-size file handling path is unnecessary because the allocation of the ser structure already uses the __GFP_ZERO flag, ensuring the memory is already zero-initialized. Reviewed-by: Pratyush Yadav Reviewed-by: Pasha Tatashin Reviewed-by: Mike Rapoport (Microsoft) Signed-off-by: Chenghao Duan --- mm/memfd_luo.c | 1 - 1 file changed, 1 deletion(-) diff --git a/mm/memfd_luo.c b/mm/memfd_luo.c index 2a01eaff03c2..bf827e574bec 100644 --- a/mm/memfd_luo.c +++ b/mm/memfd_luo.c @@ -103,7 +103,6 @@ static int memfd_luo_preserve_folios(struct file *file, if (!size) { *nr_foliosp = 0; *out_folios_ser = NULL; - memset(kho_vmalloc, 0, sizeof(*kho_vmalloc)); return 0; } -- 2.25.1