From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.13 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793265570; b=zskMixa8aBtqLJl/CdDFNwEuZ0Q9eHBEfKauca7d1j3s3XcOok/ASHWfOm9dAicvyJ2E 5isHuZeTZXE5/FFu2F8foc6mbeGrOg1plJqXFyUscCL6LCq1RcxdbdTnf4Lkxf8+lBrGp 8UbXJmdvGrEUQSD1ttcApN4RqY+A2wuVvq62MotsllyiONr4qfymtZTxD2v9mvnFUnn6H i+25FWR1QmlM0jP1ta7SvZEenOrlX+05Og9Fs9BoFWQ5FZ845bUgo/mEm8F45dPvfj+Cg LHQIO/FSSkgozPB3rK3Edn+lgi1fZVuN+oB0HlFuG1prY/DN01qhE1Gdkk8vgsa/x0w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793265570; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:From:Date:Subject:MIME-Version: Content-Type:Content-Transfer-Encoding:Message-Id:References: In-Reply-To:To:Cc:X-Mailer; bh=B1+HNg4GxAnYIKh4c9wgbbtWDKA59dTO5M6YtuRoSCM=; b=YIlLlWWM0wjZ8J5EqjmjAWdR7XTAIOoumx1OCmE/SHZFWqG/AMs+9p7jkxKtk9W0OMb9 vIXan6VELnV9xugtG1KxQaNXpULjH9fxe8nL5qgswrug0amjlaBUIraVZK8132FuqaO17 3m3/9l/dHrHWnIiGE25JIzJELMpak0IDn1pOLk69O5MssPp7XAUQIAuQM49gztm9DKlM2 jSwiaV1q6PwqPT+V1VH6S8UIfNXv/BSwDAkRtITfBXvE9OrblP4rPCWlUvjKDYqdsgWt1 WddqEEoYyuHv3ZRi4CpF9+KcKsM4qUzhKeTtOTga+javZTvsYKmag2r2hGEnUkngK+Q== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=TIJj5UHr; arc=none smtp.remote-ip=95.215.58.13 Received: from mta1.migadu.com (out-13.mta1.migadu.com [95.215.58.13]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5047F606A322 for ; Thu, 29 Oct 2026 09:19:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 5047F606A322 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=TIJj5UHr X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=f9G3wbBJcJEnE9ab3Vc7C6KZ4odr0LAbZB5DXG/9MZg=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1793265567; v=1; x=1793870367; b=TIJj5UHr50AuOCWtV9yYJmlh4vTn6S2QrFOeZzf1tSW9N4+pmgHLntBoIfb+0W4XIrPjm72y hNDY/1Db44uOE7TYgrvnrFks8dXzWdST9bHz4uyIuRBdNVf9IrljVBysVGnTbKLei5Kfl9L1pSR /bd7bbvYDD2rZLD0puVlXS0s= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 80beaf41a08f849a; Thu, 29 Oct 2026 09:19:27 +0000 X-Mizu-Trace-ID: 80beaf41a08f849a X-Migadu-Flow: FLOW_OUT From: Ye Liu Date: Thu, 29 Oct 2026 17:19:07 +0800 Subject: [PATCH v2 1/2] mm/vmalloc: drop VM_DMA_COHERENT from remap_vmalloc_range_partial X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261029-vmalloc_remap-v2-1-c4705cbf26c2@linux.dev> References: <20261029-vmalloc_remap-v2-0-c4705cbf26c2@linux.dev> In-Reply-To: <20261029-vmalloc_remap-v2-0-c4705cbf26c2@linux.dev> To: Andrew Morton , Uladzislau Rezki Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Ye Liu X-Mailer: b4 0.17-dev-39d60 From: Ye Liu No caller maps a VM_DMA_COHERENT area through this path: such areas come from dma_alloc_coherent() internals and are freed via vunmap(), never through remap_vmalloc_range[_partial](); all 13 callers pass vmalloc_user()/vmalloc()-backed addresses. The flag was added in commit fe9041c245196 ("vmalloc: lift the arm flag for coherent mappings to common code") as a mechanical translation of ARM's VM_ARM_DMA_CONSISTENT. Drop it so DMA-coherent areas can never enter the path. Signed-off-by: Ye Liu --- mm/vmalloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index db669103dc66..a888eca016a8 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -4894,7 +4894,7 @@ int remap_vmalloc_range_partial(struct vm_area_struct *vma, unsigned long uaddr, if (!area) return -EINVAL; - if (!(area->flags & (VM_USERMAP | VM_DMA_COHERENT))) + if (!(area->flags & VM_USERMAP)) return -EINVAL; if (check_add_overflow(size, off, &end_index) || -- 2.43.0