From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 2CC711A00F8 for ; Thu, 25 Sep 2014 11:14:10 +1000 (EST) In-Reply-To: <1408482065-18457-1-git-send-email-bobby.prani@gmail.com> To: Pranith Kumar , Benjamin Herrenschmidt , Paul Mackerras , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org From: Michael Ellerman Subject: Re: powerpc: Fix build failure when MEMORY_HOTPLUG=y Message-Id: <20140925011409.F1A20140143@ozlabs.org> Date: Thu, 25 Sep 2014 11:14:09 +1000 (EST) Cc: Andew Morton List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Tue, 2014-19-08 at 21:01:05 UTC, Pranith Kumar wrote: > ARCH_ENABLE_MEMORY_HOTPLUG is enabled by default for powerpc. This causes build > failures when SPARSEMEM=n as memory hotplug needs definition which are defined > only when SPARSEMEM=y. The error is as follows: > arch/powerpc/platforms/pseries/hotplug-memory.c:27:31: error: 'SECTION_SIZE_BITS' undeclared (first use in this function) > arch/powerpc/platforms/pseries/hotplug-memory.c:27:31: note: each undeclared identifier is reported only once for each function it appears in I don't see how you can even build pseries without SPARSEMEM=y ? The three options are: default DISCONTIGMEM_MANUAL if ARCH_DISCONTIGMEM_DEFAULT default SPARSEMEM_MANUAL if ARCH_SPARSEMEM_DEFAULT default FLATMEM_MANUAL We don't have DISCONTIGMEM. FLATMEM_MANUAL depends on !ARCH_SPARSEMEM_ENABLE. We turn on ARCH_SPARSEMEM_ENABLE, and it's not user editable. cheers