From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934783Ab2JXNUa (ORCPT ); Wed, 24 Oct 2012 09:20:30 -0400 Received: from smtp.citrix.com ([66.165.176.89]:49022 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934681Ab2JXNTj (ORCPT ); Wed, 24 Oct 2012 09:19:39 -0400 X-IronPort-AV: E=Sophos;i="4.80,639,1344211200"; d="scan'208";a="42269817" From: Ian Campbell To: Konrad Rzeszutek Wilk CC: Stefano Stabellini , xen-devel , linux-kernel , Ian Campbell Subject: [PATCH 1/5] xen: balloon: allow PVMMU interfaces to be compiled out Date: Wed, 24 Oct 2012 14:19:33 +0100 Message-ID: <1351084777-28898-1-git-send-email-ian.campbell@citrix.com> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1351084756.18035.28.camel@zakaz.uk.xensource.com> References: <1351084756.18035.28.camel@zakaz.uk.xensource.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The ARM platform has no concept of PVMMU and therefor no HYPERVISOR_update_va_mapping et al. Allow this code to be compiled out when not required. In some similar situations (e.g. P2M) we have defined dummy functions to avoid this, however I think we can/should draw the line at dummying out actual hypercalls. Signed-off-by: Ian Campbell --- arch/x86/xen/Kconfig | 1 + drivers/xen/Kconfig | 3 +++ drivers/xen/balloon.c | 4 ++++ 3 files changed, 8 insertions(+), 0 deletions(-) diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig index c9660bf..7e938ba 100644 --- a/arch/x86/xen/Kconfig +++ b/arch/x86/xen/Kconfig @@ -6,6 +6,7 @@ config XEN bool "Xen guest support" select PARAVIRT select PARAVIRT_CLOCK + select XEN_HAVE_PVMMU depends on X86_64 || (X86_32 && X86_PAE && !X86_VISWS) depends on X86_CMPXCHG && X86_TSC help diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig index d4dffcd..9c00652 100644 --- a/drivers/xen/Kconfig +++ b/drivers/xen/Kconfig @@ -204,4 +204,7 @@ config XEN_MCE_LOG Allow kernel fetching MCE error from Xen platform and converting it into Linux mcelog format for mcelog tools +config XEN_HAVE_PVMMU + bool + endmenu diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index 66fad33..d42da3b 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -359,6 +359,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages) set_phys_to_machine(pfn, frame_list[i]); +#ifdef CONFIG_XEN_HAVE_PVMMU /* Link back into the page tables if not highmem. */ if (xen_pv_domain() && !PageHighMem(page) && !xen_feature(XENFEAT_auto_translated_physmap)) { @@ -370,6 +371,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages) 0); BUG_ON(ret); } +#endif /* Relinquish the page back to the allocator. */ ClearPageReserved(page); @@ -418,6 +420,7 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp) scrub_page(page); +#ifdef CONFIG_XEN_HAVE_PVMMU if (xen_pv_domain() && !PageHighMem(page)) { if (!xen_feature(XENFEAT_auto_translated_physmap)) { ret = HYPERVISOR_update_va_mapping( @@ -426,6 +429,7 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp) BUG_ON(ret); } } +#endif } /* Ensure that ballooned highmem pages don't have kmaps. */ -- 1.7.2.5