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=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 9AFFCC43381 for ; Thu, 14 Mar 2019 02:53:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 745B3217F5 for ; Thu, 14 Mar 2019 02:53:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727109AbfCNCxa (ORCPT ); Wed, 13 Mar 2019 22:53:30 -0400 Received: from ozlabs.org ([203.11.71.1]:42321 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726582AbfCNCx3 (ORCPT ); Wed, 13 Mar 2019 22:53:29 -0400 Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 44KYDf4Y26z9s70; Thu, 14 Mar 2019 13:53:21 +1100 (AEDT) From: Michael Ellerman To: Alexandre Ghiti , Andrew Morton , Vlastimil Babka , Catalin Marinas , Will Deacon , Benjamin Herrenschmidt , Paul Mackerras , Martin Schwidefsky , Heiko Carstens , Yoshinori Sato , Rich Felker , "David S . Miller" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , x86@kernel.org, Dave Hansen , Andy Lutomirski , Peter Zijlstra , Mike Kravetz , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, "Aneesh Kumar K.V" Cc: Alexandre Ghiti Subject: Re: [PATCH v6 4/4] hugetlb: allow to free gigantic pages regardless of the configuration In-Reply-To: <20190307132015.26970-5-alex@ghiti.fr> References: <20190307132015.26970-1-alex@ghiti.fr> <20190307132015.26970-5-alex@ghiti.fr> Date: Thu, 14 Mar 2019 13:53:21 +1100 Message-ID: <87va0m9nfi.fsf@concordia.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Cc += Aneesh ] Alexandre Ghiti writes: > diff --git a/arch/powerpc/include/asm/book3s/64/hugetlb.h b/arch/powerpc/include/asm/book3s/64/hugetlb.h > index 5b0177733994..d04a0bcc2f1c 100644 > --- a/arch/powerpc/include/asm/book3s/64/hugetlb.h > +++ b/arch/powerpc/include/asm/book3s/64/hugetlb.h > @@ -32,13 +32,6 @@ static inline int hstate_get_psize(struct hstate *hstate) > } > } > > -#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE > -static inline bool gigantic_page_supported(void) > -{ > - return true; > -} > -#endif This is going to clash with: https://patchwork.ozlabs.org/patch/1047003/ Which does: @@ -35,6 +35,13 @@ static inline int hstate_get_psize(struct hstate *hstate) #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE static inline bool gigantic_page_supported(void) { + /* + * We used gigantic page reservation with hypervisor assist in some case. + * We cannot use runtime allocation of gigantic pages in those platforms + * This is hash translation mode LPARs. + */ + if (firmware_has_feature(FW_FEATURE_LPAR) && !radix_enabled()) + return false; return true; } #endif Not sure how to resolve it. cheers