From nobody Thu Dec 18 05:20:31 2025 Received: from mail-qk1-f202.google.com (mail-qk1-f202.google.com [209.85.222.202]) (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 9C0D322FAC2 for ; Tue, 10 Dec 2024 21:31:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.222.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733866265; cv=none; b=iL2NQBEkIAouiFb/liiahWlkTVKKSD51LUP0m83uxgl4h5xQjYXikCxVsVjVawuOUtU4P4MhDU99IGqXdz0pq7+z9K0ho62obZcrFKwgyyzJVMFrHVT4f5SydPPN3SSgDcjOQg6l02Uf4IU0/0fgjZph5njmr9TbhW5xK5TIZQI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733866265; c=relaxed/simple; bh=lgT59yOQQAh+32S2AgovLwSLHWGX99+a0idf7dOno7A=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=ML7EtsjnLCPw4R2IOmzUUcG4VyGm/nGN3KEoX8/dVED+WaUohxSNkcWj0/qm3kmMhTHJ7IMctufEsoaZAteaXoqb+Gqla+lFqD6HIiDTxwcnWRMwSAPsWbGENWFhwvZlkLn/z+7DnnvJjHqSFwu6AdcLAevTGxpbS00pZQO5xRM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--bgeffon.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=4ylsvyit; arc=none smtp.client-ip=209.85.222.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--bgeffon.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="4ylsvyit" Received: by mail-qk1-f202.google.com with SMTP id af79cd13be357-7b6e1b037d5so141593685a.0 for ; Tue, 10 Dec 2024 13:31:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1733866262; x=1734471062; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=qLtQZxHfyZ3UG9LKxPNXk6qON+2equfYqBxEH3X/7vQ=; b=4ylsvyityhFbZ+2POrQR798MdpQdWKe2vmUt9mmeOfpswcv60egk0uLA2xBxZdKmUk uOwObb0FW5iISxBp/mgW1acn8bQO8FwkA0j2siy4lZIepuQjDirnz9wzeyTIwIagE1CD flUt8apEySaXbqE6Ka2cnSBrY9bYMTlAQ43R3nfcsxO5lUyGX7T4JyhJES2raj9jTnuh vIB51D3bemybZzaY/69RsrLYId5+XRxJPi4YUy/cJa1tN8zOLNgNrNuaHqshWYiDdRJE AX8nB9Kuw1OReKQ6GDbt00QsTtMxqE1c1r13p03S4JpNu/62CudAyRpM7ARPiDTgVu/D z6Fg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733866262; x=1734471062; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=qLtQZxHfyZ3UG9LKxPNXk6qON+2equfYqBxEH3X/7vQ=; b=a/wBFplnpRQ00rylcrRX31hCbANVRgc7kywxL4lc7CTrRyx+tb9TeuTZFzRlkOUzY5 DT8DRlOuow4+QbYi40eYEZBJ+oRG1daiC97SRtawHLOCq0MnveLIy1ElKuVZ0uJ9C+z7 pzjxCJZNUEExy/UcypmLOs2WbnHoNb42sA0wylWtzUNNaIjyeXIZl/Tx7p9oycVQZxOH 18/Ld1ORsl+NK0Z9z9z82ihGArR8fsZY+Rd37s3lLAH8JcApIUGAu4KyqWnQQP+RL5kC jB8WUpPV7LcKn+YrriqZpU+aHd0ZULZYLRLdjs03jGYQsIDmvOATMiTbW2X5wBgm1SL1 ZKHw== X-Forwarded-Encrypted: i=1; AJvYcCXkZ/Z9Cn7nY3to2CYxhzkaZdGN6oZxFxDczgoS2wHnEnWs166nIegrgoOzMIlKL+eZPVRO0PgNU3NdQLw=@vger.kernel.org X-Gm-Message-State: AOJu0YzWhCvbq5teYVCKJEy44zYSjc6btWWWxfqQpIj7C0Wg7CjIBMzy mlVILTNXrmRzKC6uXEA84/FEbUMnaWM6pD7ml8VELg2uciG5vZEL5pVEj4MWBlc9LhFKYiPYelQ gycy2wQ== X-Google-Smtp-Source: AGHT+IH3NMWyVkk/B0e5FDWJt6ft3j8uGcZlVg76bwog9+Es+PKknkRKBnzr77X+s6jFQDjeJUd3QE5HwBLx X-Received: from qkkl16.prod.google.com ([2002:a37:f510:0:b0:7b6:cfce:56c5]) (user=bgeffon job=prod-delivery.src-stubby-dispatcher) by 2002:a05:620a:6181:b0:7b6:6c33:994e with SMTP id af79cd13be357-7b6eb433b8amr127896485a.6.1733866262599; Tue, 10 Dec 2024 13:31:02 -0800 (PST) Date: Tue, 10 Dec 2024 16:30:48 -0500 In-Reply-To: <20241210213050.2839638-1-bgeffon@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241210213050.2839638-1-bgeffon@google.com> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog Message-ID: <20241210213050.2839638-4-bgeffon@google.com> Subject: [RFC PATCH 3/5] mm: mremap: Allow new_addr to be specified as a hint From: Brian Geffon To: Andrew Morton Cc: Lorenzo Stoakes , Jann Horn , Vlastimil Babka , "Liam R. Howlett" , linux-mm@kvack.org, Marco Vanotti , linux-kernel@vger.kernel.org, Brian Geffon Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When using MREMAP_MAYMOVE previously the new_addr was ignored unless the user specified MREMAP_FIXED. This change will allow it to be used as a hint in that situation similar to how mmap(2) behaves. get_unmapped_area() will handle page aligning the new address hint. Signed-off-by: Brian Geffon --- mm/mremap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/mremap.c b/mm/mremap.c index fdc1b0f1b38e..1d2522fba0ef 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -1205,7 +1205,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned= long, old_len, if (vma->vm_flags & VM_MAYSHARE) map_flags |=3D MAP_SHARED; =20 - new_addr =3D get_unmapped_area(vma->vm_file, 0, new_len, + new_addr =3D get_unmapped_area(vma->vm_file, new_addr, new_len, vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT), map_flags); --=20 2.47.0.338.g60cca15819-goog