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 D805EC433E0 for ; Sat, 27 Jun 2020 05:23:34 +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 99E42207FC for ; Sat, 27 Jun 2020 05:23:34 +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="LdMXZePa"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b="lJYd2DsK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 99E42207FC 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 1jp3J1-0000pt-R8; Sat, 27 Jun 2020 01:23:11 -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 1jp3Iz-0000pn-U3 for Kernelnewbies@kernelnewbies.org; Sat, 27 Jun 2020 01:23:10 -0400 Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailout.nyi.internal (Postfix) with ESMTP id 20B865C0089; Sat, 27 Jun 2020 01:23:09 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute1.internal (MEProxy); Sat, 27 Jun 2020 01:23:09 -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=/ cHssj7TqYPLR7m6p64pv5KEpDVgntkrXx11TUrAQ2U=; b=LdMXZePaoSuVTG1Wz AfXsjulRe+2X7wQrvw6pq/IQXHUw64f6N7v0aCCbAJYS+UaMkyCUDL0NF+rUDucv kDCMO1mQDM98ZaZhjrdQMrAlUY9J/yiCnkWT8PkYjdhPgd1vJfYzbQSY7QO0GC6/ ozLFsiAFvoP8ngb90ap5X4D5XuwuTl23oG9kNlfB/9YquYN0Ek/PGNdaVmLTaQ1o Non7Q9wwa0kqAoF3YtVWmFWvr4lGfcepu/Mk5IuEjytJg5fprlMTce48h4I+DK/0 z/6UztpXOIFUlO9M0CJRKpe8r/xa3UOsMsjCGVdd/MH4hcEbs++54+1e746kL9iX HmSvA== 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=/cHssj7TqYPLR7m6p64pv5KEpDVgntkrXx11TUrAQ 2U=; b=lJYd2DsKnU2f5pt7cz+pjtG/FRd+tJAZbzzK5bNlaWsRqYWrAvJO6tEqg 7pT6VmemNk1iRyi3N3UBINfNb2idF99fKeBkIWs8K/wVTqjiJTivNqniHdo3/0vR vLdv/V0CN/ANniEI0vd+EIuho6FkJl/wkAYLxQY6frdr2LOXiMmYOIw5W9ByP8rc HOTA5FNBqcSzxkAe91Wcf/tvHzNL2QzVe/diQ+PxP71ac/hqmenzyWsXc4Y0LfLE RJa5KGRtXmgshzNOEwkmSno1mzOfaFF/ewqVeh4KJSIiIRiCDVYkNm0K32GMghTM EB62hIWaLI88zCmZinBZ0QG+cnG5Q== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduhedrudelvddgleeiucetufdoteggodetrfdotf 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 CC250328005E; Sat, 27 Jun 2020 01:23:07 -0400 (EDT) Date: Sat, 27 Jun 2020 07:23:06 +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: <20200627052306.GA248434@kroah.com> References: <20200626141319.GC4140284@kroah.com> <67284.1593192143@turing-police> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Cc: Valdis =?utf-8?Q?Kl=C4=93tnieks?= , 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 T24gU2F0LCBKdW4gMjcsIDIwMjAgYXQgMDE6MTY6NTBQTSArMDgwMCwg5a2Z5LiW6b6ZIHN1bnNo aWxvbmcgd3JvdGU6Cj4gPlNvIGFzIHBlciB0aGUgYWJvdmUgLSB5b3UgYWxsb2NhdGUgb25lIHN0 cnVjdCBhcnJheSBhdCBkcml2ZXIgbG9hZCB0aW1lIGZvcgo+ID50aGlzIHN0dWZmLiAgWW91IGFs cmVhZHkga25vdyBob3cgYmlnIHRoZSBzdHJ1Y3R1cmUvYXJyYXkgaGFzIHRvIGJlIGJhc2VkIG9u Cj4gPnRoZSBtYXhpbXVtIG51bWJlciBvZiBkZXZpY2VzIG9yIHdoYXRldmVyIHlvdSdyZSB0cnlp bmcgdG8gdHJhY2suCj4gPkFuZCBpZiB5b3UgZG9uJ3Qga25vdyB0aGUgbWF4aW11bSwgeW91J3Jl IG5vdCBkb2luZyByZWFsIHRpbWUgcHJvZ3JhbW1pbmcuIE9yCj4gPmF0IGxlYXN0IG5vdCBjb3Jy ZWN0bHkuCj4gTm90IGF0IHRoZSBkcml2ZXIgbG9hZCB0aW1lLCBidXQgdGhlIGxvYWQgdGltZSBv ZiB0aGUgcmVhbC10aW1lCj4gcHJvY2VzcyhpLmUuIGJlZm9yZQo+IHRoZSBlbnRyeSBvZiB0aGUg bWFpbigpIGZ1bmN0aW9uKS4gSXQgbmVlZHMgdG8gYWxsb2NhdGUoaS5lLiB1c2UKPiB2bWFsbG9j KSBhIGh1Z2UgbWVtb3J5Cj4gKGkuZS4gZm9yIGV4YW1wbGUgODBNQiwgbWF5YmUgNTBNQiAoaG93 IG11Y2ggbWVtb3J5IGlzIHN1aXRhYmxlIGlzIGRlY2lkZWQgYnkKPiB0aGUgc3BlY2lmaWMgYXBw bGljYXRpb25zLikgdXNlZCBieSB0aGUgdXNlciBhcHBsaWNhdGlvbiBsYXRlci4gQW5kCj4gdGhh dCdzIG9rIHRvIGFsbG9jYXRlCj4gc28gaHVnZSBtZW1vcnkgc2l6ZSBieSB2bWFsbG9jKCkgYW5k IG5vIGVycm9yIGNvbXBsYWluZWQgYnkgdGhlIGtlcm5lbC4KCkFwcGxpY2F0aW9ucyBkbyBub3Qg YWxsb2NhdGUga2VybmVsIG1lbW9yeSBhdCBhbGwsIHRoYXQncyB1cCB0byBhIGtlcm5lbApkcml2 ZXIuICBVc2Vyc3BhY2UgZG9lcyB0aGluZ3MgaW4gdG90YWxseSBkaWZmZXJlbnQgd2F5cy4KCkFn YWluLCBkbyB5b3UgaGF2ZSBhIHBvaW50ZXIgdG8geW91ciBrZXJuZWwgc291cmNlIGNvZGUgdGhh dCBpcyBkb2luZwp0aGlzIGFsbG9jYXRpb24gdGhhdCBpcyBmYWlsaW5nPwoKdGhhbmtzLAoKZ3Jl ZyBrLWgKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCktl cm5lbG5ld2JpZXMgbWFpbGluZyBsaXN0Cktlcm5lbG5ld2JpZXNAa2VybmVsbmV3Ymllcy5vcmcK aHR0cHM6Ly9saXN0cy5rZXJuZWxuZXdiaWVzLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2tlcm5lbG5l d2JpZXMK