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Mon, 23 Mar 2026 19:07:55 +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, Chenghao Duan Subject: [PATCH v2 3/4] mm/memfd_luo: remove unnecessary memset in zero-size memfd path Date: Mon, 23 Mar 2026 19:07:46 +0800 Message-Id: <20260323110747.193569-4-duanchenghao@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260323110747.193569-1-duanchenghao@kylinos.cn> References: <20260323110747.193569-1-duanchenghao@kylinos.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 6AD3B1C000C X-Stat-Signature: mmdz99g9y161pwmms1gi594da1os7ysw X-Rspam-User: X-HE-Tag: 1774264082-837938 X-HE-Meta: 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 ZpCVmVl+ r8g2p/mDuKlg4OjR1zQkJMG2bhIT/OlNQOhcYSNaueU62HGJHkj5Mj4wXMndtsKYVdtWuJXdlNUOdBe3YcuRZlOr+f4xyZXY4vS3E 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