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 0DCDCC433DF for ; Sat, 27 Jun 2020 05:06:34 +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 95E9120707 for ; Sat, 27 Jun 2020 05:06:32 +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="C9XDFNah"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b="Y9HWiST5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 95E9120707 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 1jp32L-0000Cp-1A; Sat, 27 Jun 2020 01:05:57 -0400 Received: from out5-smtp.messagingengine.com ([66.111.4.29]) by shelob.surriel.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1jp32H-0000Cb-Lm for Kernelnewbies@kernelnewbies.org; Sat, 27 Jun 2020 01:05:54 -0400 Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailout.nyi.internal (Postfix) with ESMTP id 915E95C00B2; Sat, 27 Jun 2020 01:05:49 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute1.internal (MEProxy); Sat, 27 Jun 2020 01:05:49 -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=T bpNmqhH1Ihwnzqgojw5Jpgz0Mqt4d5dvTR0JJN1Lyw=; b=C9XDFNahntPZTk0MN gYA/m/sONrGpL+PRDnGHbAP5LTHyzqFOflsMvArY6MTtzIH/nbnkfo9IvDzj7ASv 5RGnUDvdOKxTR4/PMo6tCCgZNsS7pCe+jB3lWx08vAhclQ1qLhH924ZPywsAVgnx Bj0PrwCSMfgZSNZHqoF1iwkRl0gMUj7+HkfimdYhG+KeJ18NmVu6XsR8p0B9Az0a E7PJVxTzTLcblv4BGNJiJptjIn7nOzxemjt/ENSFUIFB0gcWLhwjo8+Brl19k3gC +3B8sTxYZ7w0b3n5crwiDyEFyrbEARAZMkyp2ZExcFD/VwiT5MtegNMfslELjBYp pWW0w== 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=TbpNmqhH1Ihwnzqgojw5Jpgz0Mqt4d5dvTR0JJN1L yw=; b=Y9HWiST5GGG1Ej4LkRlVj8CvwVjJ12PPfgJmjFSU0ETx+uZQRghBtSo1L mJw/bXOd2cLKaVE8DV7wBjKwv554WbP1DLXJu0Hyvw3tQZjLIYCzrAsjxkHDVudh NtCjzsOnnMFEOh99gyII+wtqVTp5mwTb0RQgTQAoYTNbmRN2Pldq6QwzsWAg8s6p h9D1t7fuKMu0OBWodCQMUtL7iSK2AKPW0BH/3dtnT/rY6efQFgc4kuBQ+8ktyotO OtjFRyJht70kmhWdfDxCpydcl+8VUOeUTKftpFznrGcmoo3HcNRQn/6CoYMO/C3P nvEA+hpNHu4uCIPRcdeTMMnmxCnqg== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduhedrudelvddgledvucetufdoteggodetrfdotf 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 15D6B3280060; Sat, 27 Jun 2020 01:05:48 -0400 (EDT) Date: Sat, 27 Jun 2020 07:05:46 +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: <20200627050546.GC226238@kroah.com> References: <20200626141319.GC4140284@kroah.com> 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 T24gRnJpLCBKdW4gMjYsIDIwMjAgYXQgMTE6MzY6MDVQTSArMDgwMCwg5a2Z5LiW6b6ZIHN1bnNo aWxvbmcgd3JvdGU6Cj4gVGhhbmsgeW91IGZvciB5b3VyIGF0dGVudGlvbiB0byB0aGlzIG1hdHRl ci4KPiAKPiA+V2h5IGFyZSB5b3UgaGF2aW5nIHNvIG1hbnkgaXNzdWVzIGluIGFsbG9jYXRpbmcg bWVtb3J5Pwo+IEkgb2Z0ZW4gc2F3IHRoZSBwYWdlIGFsbG9jYXRpb24gZmFpbHVyZSByZWNlbnRs eS4gSSBtdXN0IHJlc29sdmUgdGhpcyBwcm9ibGVtLgoKV2hhdCBjb2RlIGlzIGNhdXNpbmcgdGhh dCBmYWlsdXJlIGJ5IGFza2luZyBmb3IgbWVtb3J5IHRoYXQgeW91IGRvIG5vdApoYXZlPyAgUGxl YXNlIGZpeCB0aGF0IHVwLCB0aGUgY29yZSBrZXJuZWwgc2hvdWxkIGJlIGZpbmUuCgo+IEkgaGF2 ZSBubyBjaG9pY2Ugb3RoZXIgdGhhbiBkaXNhYmxpbmcgdGhlc2Ugb3B0aW9ucwo+IChpLmUuIENP TkZJRy1NSUdSQVRJT04gYW5kIENPTkZJRy1DT01QQUNUSU9OKQo+IHNpbmNlIEkgYW0gdXNpbmcg YSByZWFsLXRpbWUgT1MuCgpBcyB3YXMgYWxyZWFkeSBzdGF0ZWQsIHRoZSB1c2Ugb2YgInJlYWwt dGltZSIgaGFzIG5vdGhpbmcgdG8gZG8gd2l0aAp0aG9zZSBvcHRpb25zLCBvciBtZW1vcnkgYWxs b2NhdGlvbiwgb3IgYW55dGhpbmcgZWxzZSBoZXJlLiAgUGxlYXNlIGRvCm5vdCBnZXQgY29uZnVz ZWQgYWJvdXQgdGhlIGRldGVybWluaXNpdGljIG9wZXJhdGlvbiBvZgppbnRlcnJ1cHRzL3NjaGVk dWxpbmcgdnMuIGFueXRoaW5nIGVsc2UuCgo+IEl0J3MgZWFzaWVyIHRvIGVuY291bnRlciBzdWNo IGEgcHJvYmxlbSBzaW5jZSB0aGUgc2FpZCBvcHRpb25zIGFyZSBkaXNhYmxlZC4KClRoZW4gZml4 IHlvdXIgYnJva2VuIGRyaXZlciB0aGF0IGlzIGFza2luZyBmb3Igc28gbXVjaCBtZW1vcnkgb24g YQpzeXN0ZW0gdGhhdCBkb2VzIG5vdCBoYXZlIGl0LiAgRG8geW91IGhhdmUgYSBwb2ludGVyIHRv IHlvdXIgZHJpdmVyCmFueXdoZXJlIHNvIHdlIGNhbiByZXZpZXcgaXQ/Cgpnb29kIGx1Y2shCgpn cmVnIGstaAoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18K S2VybmVsbmV3YmllcyBtYWlsaW5nIGxpc3QKS2VybmVsbmV3Ymllc0BrZXJuZWxuZXdiaWVzLm9y ZwpodHRwczovL2xpc3RzLmtlcm5lbG5ld2JpZXMub3JnL21haWxtYW4vbGlzdGluZm8va2VybmVs bmV3Ymllcwo=