From nobody Sat Feb 7 08:44:13 2026 Received: from mail-oa1-f49.google.com (mail-oa1-f49.google.com [209.85.160.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 01491194156 for ; Tue, 30 Jul 2024 08:27:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.49 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722328069; cv=none; b=FRtrqhsnICnhA02nzwo4gyU09UYStkZTdyFFGC694j9rdnqGdzjJLbb1X45eze+kmnapKK497WrvfRsUlabQUHxHh1g56RGeGd+bVxEzT+dQqcrEVTwSedWceXkGlw2eBPu1RV4GAn5WJz81DQQRS5ofPsBB+9g/2bsg8HahHEg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722328069; c=relaxed/simple; bh=OiO5UAluMGH15+ecE2HSNa1RCksWRZlw4yMoX9NzHB8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=OnWrSPxEdU6uasAbaWtGXIrIKMZ+gUHUblb+E1XbEdwF1QJXQtLuzx2f4pbv6voZYwKgbr7DUx60EFrGdO40q9kaj5+aW8TzJ7fo2tdcj76j/pmnOe73UsroMf/9f1psh79TqJUamNkNTNb0aDmKrJmQDASqSnV0c9e4kW1MTVY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=gl98/i65; arc=none smtp.client-ip=209.85.160.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="gl98/i65" Received: by mail-oa1-f49.google.com with SMTP id 586e51a60fabf-264988283a3so2573145fac.0 for ; Tue, 30 Jul 2024 01:27:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1722328067; x=1722932867; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=FD69V+SEf3VTzCz0q/lThcouLOtxPJMVTQPRVoHNK8w=; b=gl98/i65IBC+ysYRwfFs0a6f+ds7HNErWhcQV0yqR3ruv3A2VH8PIDuYR2YkwCPX0Z VhitLq7AehR8FQoNBaOYvTS0rqZczB6+PsEYUZ3b/mNkgE45UqBykPy54LZFF0JSf4X4 i3Mq2fizyZnRGBWYvje8vbMIr6zW51puCwpaTPPbLhYvritR17JAv+QCEBjIKMpa81jV zYn975w2UAprc9mXGEfGcZUm+nUgMM+ukBVAadxrPGFI3MOodIG2C0Hi4UDK46k9eU+L Rci3PuObibpJ8qmGo+vNqW0Qw4HNd+fi64gY2D0R4PPvZJToWwqNaaZQw6OYVo9Jp/9q 2ciQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722328067; x=1722932867; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=FD69V+SEf3VTzCz0q/lThcouLOtxPJMVTQPRVoHNK8w=; b=pat+NG7MclqBcxVkf/RaIdO9aQSpF+u2WAcpEXen9THzHzgNaOOzPnt8M/KV998bBY bxaGChY82DrI8vBwMt+AO/l7zcVXqV5xklxvDxCzP1YqtCYa5T15nPVyaFrv37qKwNcr CCbDMickCRvXSk75VXjkHgDIC7RHxZZ3JMRbPUYcz9VDuIi1b3/2Bj1i9VdX3zKs1eC+ 1+wYkDoGbDfIQ5obKnLsHIG80tSiqfy6XW2Y9KVyz9soNoPcBTsCzAeMhu5EV51Bpbq9 nCEM8Mr0nraH0Cb4NLuR9hvbbNzZFGxJeOMRrc/abpHtFyranX0we9zq60ETqpgy5N8l 55Dw== X-Forwarded-Encrypted: i=1; AJvYcCW+JTgCdGesRWaizDKx7KdKDMCoEXN5vlMkbL2TX3RYesxun6sluG/1cKRfymRisfO3Owl76UzZJnWRRvk9yJdWd4XWT0hk/b3vD628 X-Gm-Message-State: AOJu0Yzm6FY5wVe92vB4xhlNoPE/yTSUYPz9A1uWn6ranBklwcD9+WMN nXbQ4RurY+r56S0iWpLG7KCH8Hzs9ohui1ETbDnR7nEPFpF+CJhJ X-Google-Smtp-Source: AGHT+IGMDtjFzoJvTNv0HkvGGR2DW4nWS0t5fU/JDbdbj//BhkM0SEV5svR4Ogu5z/TQNie6PX8b6Q== X-Received: by 2002:a05:6870:206:b0:260:e096:414c with SMTP id 586e51a60fabf-267d4f34e2amr12419301fac.49.1722328066831; Tue, 30 Jul 2024 01:27:46 -0700 (PDT) Received: from localhost ([222.190.105.194]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7a9f8751ab7sm7169492a12.42.2024.07.30.01.27.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Jul 2024 01:27:46 -0700 (PDT) From: "zhijun.han" To: brauner@kernel.org, linux-kernel@vger.kernel.org Cc: hanzj.it@gmail.com Subject: [PATCH] fork: Using oldmm replace current->mm for dup_mm Date: Tue, 30 Jul 2024 16:27:25 +0800 Message-ID: <20240730082725.7477-1-hanzj.it@gmail.com> X-Mailer: git-send-email 2.45.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In the current implementation of copy_mm(),there is a line initializes `oldmm =3D current->mm` before dup_mm. This means that there is no longer a need to use current->mm for dup_mm. Signed-off-by: zhijun.han --- kernel/fork.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/fork.c b/kernel/fork.c index 41771bde2ce7..833557bb0187 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1720,7 +1720,7 @@ static int copy_mm(unsigned long clone_flags, struct = task_struct *tsk) mmget(oldmm); mm =3D oldmm; } else { - mm =3D dup_mm(tsk, current->mm); + mm =3D dup_mm(tsk, oldmm); if (!mm) return -ENOMEM; } --=20 2.45.2