From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3D02FC433DF for ; Fri, 26 Jun 2020 14:14:29 +0000 (UTC) Received: from shelob.surriel.com (shelob.surriel.com [96.67.55.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E5FFF207D8 for ; Fri, 26 Jun 2020 14:14:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=kroah.com header.i=@kroah.com header.b="iwPYaIjq"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b="hFdaHakf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E5FFF207D8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kroah.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernelnewbies-bounces@kernelnewbies.org Received: from localhost ([::1] helo=shelob.surriel.com) by shelob.surriel.com with esmtp (Exim 4.94) (envelope-from ) id 1jop6l-00067q-Bb; Fri, 26 Jun 2020 10:13:35 -0400 Received: from out1-smtp.messagingengine.com ([66.111.4.25]) by shelob.surriel.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1jop6h-00067i-Rm for Kernelnewbies@kernelnewbies.org; Fri, 26 Jun 2020 10:13:32 -0400 Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailout.nyi.internal (Postfix) with ESMTP id D00285C00EC; Fri, 26 Jun 2020 10:13:25 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute1.internal (MEProxy); Fri, 26 Jun 2020 10:13:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kroah.com; h= date:from:to:cc:subject:message-id:references:mime-version :content-type:content-transfer-encoding:in-reply-to; s=fm1; bh=P yvWna4OxJVkJr0P0W+Yu8kQ8TFjG1iR+NLlMJpKB9I=; b=iwPYaIjq376XVDBXW KUTWpFZteLSov7x2qtiXGRfh4Qaz2VlRU6hP+dC21515BLTNjMz3RlYoNVv91R6p bINvDEsaa1H2+KM5c6R3BrfkBca4KOo33L0ubuA0mmD8Hq4rJ2/jb05rEZhuHZy/ /hY1Cg4ad1xC1IcygdkK8ADvg5hTilYWUmAwr/gCXR1iAYFZEaODkksXrsbBBKIT oXIYA5cSXUlmzbS9sqwWbp50BjCjAA7g5zhhiM1+gJKfFEWg9N6h6xzQhuA9R9PP g71Kh5umoxQNS+BYIi+ss6vmdTd0lJG7RLmgWaq0cGSjLd4yLW4misj1cNco9LQH pxveA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:in-reply-to:message-id:mime-version:references :subject:to:x-me-proxy:x-me-proxy:x-me-sender:x-me-sender :x-sasl-enc; s=fm3; bh=PyvWna4OxJVkJr0P0W+Yu8kQ8TFjG1iR+NLlMJpKB 9I=; b=hFdaHakfIY+uIBocMC2rAsQvuO/PHoPt9/bBLaB6HOcXuLNN1GnTRapAH EFytft38FQicLuJEmOo3m1+/XTQvBEL17vTUM7OYYA2ZNGINkB8JPpC7olwfeW9s ulU3T9nQjZr5DMyQUEb9KRhGGzCjDqoOMokINzeZkKGqOmTmGZhi3EXZC+t6qXcr /zyT5qkPgXzzEd9k51Oi+bWNBqV0VtgYuazMcWC6PXsHfF8wPM7OGYu8AeLnNIrt s2GzMnGH0fYck3O6hPboJwiKFqgaK6pNYdNboxgi2/iMtmjD6N15c+DcLbHIBOhF Zg/XhnFGUtaIAxWgjVHAxYI1TawhA== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduhedrudeluddgjeehucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhepfffhvffukfhfgggtugfgjgesthekredttddtjeenucfhrhhomhepifhrvghg ucfmjfcuoehgrhgvgheskhhrohgrhhdrtghomheqnecuggftrfgrthhtvghrnhepueehke ehlefffeeiudetfeekjeffvdeuheejjeffheeludfgteekvdelkeduuddvnecukfhppeek fedrkeeirdekledruddtjeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmh grihhlfhhrohhmpehgrhgvgheskhhrohgrhhdrtghomh X-ME-Proxy: Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) by mail.messagingengine.com (Postfix) with ESMTPA id 1C4C73280063; Fri, 26 Jun 2020 10:13:25 -0400 (EDT) Date: Fri, 26 Jun 2020 16:13:19 +0200 From: Greg KH To: =?utf-8?B?5a2Z5LiW6b6Z?= sunshilong Subject: Re: Are there some potential problems that I should be aware of if I allocate the memory which doesn't have any relation to peripheral hardwares(i.e. DMA, PCI, serial port and etc) by vmalloc() instead of kmalloc()? Message-ID: <20200626141319.GC4140284@kroah.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Cc: Kernelnewbies@kernelnewbies.org X-BeenThere: kernelnewbies@kernelnewbies.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Learn about the Linux kernel List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: kernelnewbies-bounces@kernelnewbies.org T24gRnJpLCBKdW4gMjYsIDIwMjAgYXQgMDQ6MzA6NDhQTSArMDgwMCwg5a2Z5LiW6b6ZIHN1bnNo aWxvbmcgd3JvdGU6Cj4gSGksIGxpc3QKPiAKPiBCZXNpZGVzIGttYWxsb2MoKSBpcyBtb3JlIGVm ZmljaWVudCwgYXJlIHRoZXJlIHNvbWUgcG90ZW50aWFsIHByb2JsZW1zIHRoYXQKPiBJIHNob3Vs ZCBiZSBhd2FyZSBvZiBpZiBJIGFsbG9jYXRlIHRoZSBtZW1vcnkgd2hpY2ggZG9lc24ndCBoYXZl IGFueQo+IHJlbGF0aW9uIHRvIHBlcmlwaGVyYWwgaGFyZHdhcmVzKGkuZS4gRE1BLFBDSSxzZXJp YWwgcG9ydCBhbmQgZXRjKSBieQo+IHZtYWxsb2MoKSBpbnN0ZWFkIG9mIGttYWxsb2MoKSB0byBh dm9pZCB0aGUgcGFnZSBhbGxvY2F0aW9uIGZhaWx1cmUoY2F1c2VkCj4gYnkga21hbGxvYygpIHdo aWxlIHRoZXJlIGFyZSB0b28gbXVjaCBtZW1vcnkgZnJhZ21lbnQpPwoKSXQgYWxsIGRlcGVuZHMg b24gd2hhdCB5b3Ugd2FudCB0byBkbyB3aXRoIHRoYXQgbWVtb3J5LgoKV2h5IGFyZSB5b3UgaGF2 aW5nIHNvIG1hbnkgaXNzdWVzIGluIGFsbG9jYXRpbmcgbWVtb3J5PyAgRG9lcyB0aGUga2VybmVs Cm5vdCBwcm92aWRlIGVub3VnaCBkaWZmZXJlbnQgd2F5cyB0byBkbyB0aGlzIGZvciB5b3VyIGRy aXZlci9kZXZpY2UvdXNlCmNhc2U/CgpJZiBub3QsIHdoYXQgYXJlIHlvdSB0cnlpbmcgdG8gZG8g dGhhdCBpcyBub3QgZml0dGluZyB3aXRoIHRoZSBleGlzdGluZwppbnRlcmZhY2VzPwoKdGhhbmtz LAoKZ3JlZyBrLWgKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fCktlcm5lbG5ld2JpZXMgbWFpbGluZyBsaXN0Cktlcm5lbG5ld2JpZXNAa2VybmVsbmV3Ymll cy5vcmcKaHR0cHM6Ly9saXN0cy5rZXJuZWxuZXdiaWVzLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2tl cm5lbG5ld2JpZXMK