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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5044BC4167D for ; Mon, 6 Nov 2023 20:20:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233007AbjKFUUm (ORCPT ); Mon, 6 Nov 2023 15:20:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37550 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232884AbjKFUUi (ORCPT ); Mon, 6 Nov 2023 15:20:38 -0500 Received: from out-171.mta1.migadu.com (out-171.mta1.migadu.com [IPv6:2001:41d0:203:375::ab]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CD8E010D3 for ; Mon, 6 Nov 2023 12:20:33 -0800 (PST) Message-ID: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1699302032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=Czz03c7B8Ipf+ig640Okg2kezVH+J+rO2vcFaPEA8SI=; b=DUfW9aQoAa6yKtr/cSFLVHgtZXmLbklWuRO7WXE/j1JrkjsJsNMrdL9JM/X5hyc4CvQVgc VKZrg1bf4JGwU5MYJfFY67bBfbpXqWaEufPekT2By+ItH2VeISDVk4PeVAUU4p0qQYS3j1 s7fWM2zNpy7lyxKrwsA0maqUNITNcR8= Date: Mon, 6 Nov 2023 23:20:30 +0300 MIME-Version: 1.0 Content-Language: en-US To: Sergey Senozhatsky , Minchan Kim X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Vasily Averin Cc: "linux-kernel@vger.kernel.org" , linux-block@vger.kernel.org Subject: question about ZRAM_HUGE flag Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ZRAM_HUGE flag doubles most significant bit in zram size. I had an idea to redefine it, but do not fully understand how to do it correctly. I'm sure that MSB = PAGE_SHIFT on BIG_ENDIAN but do not understand what's happen on LITTLE_ENDIAN? Is MSB = 0 in this case? Could it have some other unpredictable value? In any case I think we can always replace ZRAM_HUGE bit check by BIT(PAGE_SHIFT) test. Thank you, Vasily Averin